基本数据类型（数字&字符串）

1.python中的数据类型

　　python使用对象模型来存储数据，每一个数据类型都有一个内置的类，每新建一个数据，实际就是在初始化生成一个对象，即所有数据都是对象。
　　对象的三个特性

身份：内存地址，可以用id()获取
类型：决定了该对象可以保存什么类型值，可执行何种操作，需遵循什么规则，可用type()获取
值：对象保存的真实数据

　　注：我们在定义数据类型，只需这样：x＝1，内部生成数字类型1这一内存对象会自动触发，我们无需关心

　　数据类型

　　这里的字符串、数字、列表等都是数据类型,除此之外还有很多其他数据，处理不同的数据就需要定义不同的数据类型。

标准类型
数字
字符串
列表
元组
字典

其他类型
类型type
Null
文件
集合
函数／方法
类
模块

2.标准数据类型

　2.1 数字

定义：a＝1
特性：
    1.只能存放一个值
    2.一经定义，不可更改
    3.直接访问
分类：整型，长整型，布尔，浮点，复数

2.1.1 整形

　　　　Python中的整数属于int类型，默认用十进制表示，此外也支持二进制，八进制,十六进制表示方式。

>>> 10
10            --------->默认十进制

>>> bin(10)
'0b1010'      --------->二进制表示整数时，数值前面要加上一个前缀“0b”
>>> oct(10)
'012'         --------->八进制表示整数时，数值前面要加上一个前缀“0”
>>> hex(10)
'0xa'         --------->十六进制表示整数时，数字前面要加上前缀0X或0x

　　python2.*与python3.*关于整型的区别：

python2.*
　　在32位机器上，整数的位数为32位，取值范围为-2**31～2**31-1，即-2147483648～2147483647
　　在64位系统上，整数的位数为64位，取值范围为-2**63～2**63-1，即-9223372036854775808～9223372036854775807
　　
python3.*
　　整行长度无限制

py2与py3整型长度约束

2.1.2 bool型

　　　　bool型只有两个值：True和False

　　　　之所以将bool值归类为数字，是因为我们也习惯用1表示True，0表示False。

2.1.3 float型

　　Python的浮点数就是数学中的小数。

　　在运算中，整数与浮点数运算的结果也是一个浮点数。

浮点数也就是小数，之所以称为浮点数，是因为按照科学记数法表示时，
一个浮点数的小数点位置是可变的，比如，1.23*109和12.3*108是相等的。
浮点数可以用数学写法，如1.23，3.14，-9.01，等等。但是对于很大或很小的浮点数，
就必须用科学计数法表示，把10用e替代，1.23*109就是1.23e9，或者12.3e8，0.000012
可以写成1.2e-5，等等。
整数和浮点数在计算机内部存储的方式是不同的，整数运算永远是精确的而浮点数运算则可能会有
四舍五入的误差。

小数为什么叫做浮点数？

2.1.4 comple型

　　复数由实数部分和虚数部分组成，一般形式为x＋yj，其中的x是复数的实数部分，y是复数的虚数部分，这里的x和y都是实数。
　　注，虚数部分的字母j大小写都可以。　　

>>> 1.3 + 2.5j == 1.3 + 2.5J
True

2.1.5 数字相关内建函数

2.2 字符串

2.2.1 定义与特性

　　字符串是一个有序的字符的集合，用于存储和表示基本的文本信息，' '或'' ''或''' '''中间包含的内容称之为字符串
　　特性：
　　　　1.只能存放一个值
　　　　2.不可变
　　　　3.按照从左到右的顺序定义字符集合，下标从0开始顺序访问，有序
　　补充：
　　　　1.字符串的单引号和双引号都无法取消特殊字符的含义，如果想让引号内所有字符均取消特殊意义，在引号前面加r，如name＝r'l\thf'
　　　　2.unicode字符串与r连用必需在r前面，如name＝ur'l\thf'

2.2.2 字符串的创建与常用操作

　　　　创建：

　　　　　　s = 'Hello,Eva！How are you?'

　　　　常用操作：

　　　　　　索引

　　　　　　切片

　　　　　　移除空白 strip

　　　　　　大小写转换upper/lower

　　　　　　替换replace

　　　　　　分割 split

　　　　　　包含 startswith/endswith/index/find

　　　　　　判断成分 isdigit/isalpha

　　　　　计算长度 len函数

2.2.3 str字符串工厂函数

class str(object):
    """
    str(object='') -> str
    str(bytes_or_buffer[, encoding[, errors]]) -> str
Create a new string object from the given object. If encoding or
errors is specified, then the object must expose a data buffer
that will be decoded using the given encoding and error handler.
Otherwise, returns the result of object.__str__() (if defined)
or repr(object).
encoding defaults to sys.getdefaultencoding().
errors defaults to 'strict'.
</span><span style="color: #800000;">"""</span>
<span style="color: #0000ff;">def</span> capitalize(self): <span style="color: #008000;">#</span><span style="color: #008000;"> real signature unknown; restored from __doc__</span>
    <span style="color: #800000;">"""</span><span style="color: #800000;">
    首字母变大写
    S.capitalize() -&gt; str

    Return a capitalized version of S, i.e. make the first character
    have upper case and the rest lower case.
    </span><span style="color: #800000;">"""</span>
    <span style="color: #0000ff;">return</span> <span style="color: #800000;">""</span>

<span style="color: #0000ff;">def</span> casefold(self): <span style="color: #008000;">#</span><span style="color: #008000;"> real signature unknown; restored from __doc__</span>
    <span style="color: #800000;">"""</span><span style="color: #800000;">
    S.casefold() -&gt; str

    Return a version of S suitable for caseless comparisons.
    </span><span style="color: #800000;">"""</span>
    <span style="color: #0000ff;">return</span> <span style="color: #800000;">""</span>

<span style="color: #0000ff;">def</span> center(self, width, fillchar=None): <span style="color: #008000;">#</span><span style="color: #008000;"> real signature unknown; restored from __doc__</span>
    <span style="color: #800000;">"""</span><span style="color: #800000;">
    原来字符居中，不够用空格补全
    S.center(width[, fillchar]) -&gt; str

    Return S centered in a string of length width. Padding is
    done using the specified fill character (default is a space)
    </span><span style="color: #800000;">"""</span>
    <span style="color: #0000ff;">return</span> <span style="color: #800000;">""</span>

<span style="color: #0000ff;">def</span> count(self, sub, start=None, end=None): <span style="color: #008000;">#</span><span style="color: #008000;"> real signature unknown; restored from __doc__</span>
    <span style="color: #800000;">"""</span><span style="color: #800000;">
     从一个范围内的统计某str出现次数
    S.count(sub[, start[, end]]) -&gt; int

    Return the number of non-overlapping occurrences of substring sub in
    string S[start:end].  Optional arguments start and end are
    interpreted as in slice notation.
    </span><span style="color: #800000;">"""</span>
    <span style="color: #0000ff;">return</span><span style="color: #000000;"> 0

</span><span style="color: #0000ff;">def</span> encode(self, encoding=<span style="color: #800000;">'</span><span style="color: #800000;">utf-8</span><span style="color: #800000;">'</span>, errors=<span style="color: #800000;">'</span><span style="color: #800000;">strict</span><span style="color: #800000;">'</span>): <span style="color: #008000;">#</span><span style="color: #008000;"> real signature unknown; restored from __doc__</span>
    <span style="color: #800000;">"""</span><span style="color: #800000;">
    encode(encoding='utf-8',errors='strict')
    以encoding指定编码格式编码，如果出错默认报一个ValueError，除非errors指定的是
    ignore或replace

    S.encode(encoding='utf-8', errors='strict') -&gt; bytes

    Encode S using the codec registered for encoding. Default encoding
    is 'utf-8'. errors may be given to set a different error
    handling scheme. Default is 'strict' meaning that encoding errors raise
    a UnicodeEncodeError. Other possible values are 'ignore', 'replace' and
    'xmlcharrefreplace' as well as any other name registered with
    codecs.register_error that can handle UnicodeEncodeErrors.
    </span><span style="color: #800000;">"""</span>
    <span style="color: #0000ff;">return</span> b<span style="color: #800000;">""</span>

<span style="color: #0000ff;">def</span> endswith(self, suffix, start=None, end=None): <span style="color: #008000;">#</span><span style="color: #008000;"> real signature unknown; restored from __doc__</span>
    <span style="color: #800000;">"""</span><span style="color: #800000;">
    S.endswith(suffix[, start[, end]]) -&gt; bool

    Return True if S ends with the specified suffix, False otherwise.
    With optional start, test S beginning at that position.
    With optional end, stop comparing S at that position.
    suffix can also be a tuple of strings to try.
    </span><span style="color: #800000;">"""</span>
    <span style="color: #0000ff;">return</span><span style="color: #000000;"> False

</span><span style="color: #0000ff;">def</span> expandtabs(self, tabsize=8): <span style="color: #008000;">#</span><span style="color: #008000;"> real signature unknown; restored from __doc__</span>
    <span style="color: #800000;">"""</span><span style="color: #800000;">
    将字符串中包含的\t转换成tabsize个空格
    S.expandtabs(tabsize=8) -&gt; str

    Return a copy of S where all tab characters are expanded using spaces.
    If tabsize is not given, a tab size of 8 characters is assumed.
    </span><span style="color: #800000;">"""</span>
    <span style="color: #0000ff;">return</span> <span style="color: #800000;">""</span>

<span style="color: #0000ff;">def</span> find(self, sub, start=None, end=None): <span style="color: #008000;">#</span><span style="color: #008000;"> real signature unknown; restored from __doc__</span>
    <span style="color: #800000;">"""</span><span style="color: #800000;">
    S.find(sub[, start[, end]]) -&gt; int

    Return the lowest index in S where substring sub is found,
    such that sub is contained within S[start:end].  Optional
    arguments start and end are interpreted as in slice notation.

    Return -1 on failure.
    </span><span style="color: #800000;">"""</span>
    <span style="color: #0000ff;">return</span><span style="color: #000000;"> 0

</span><span style="color: #0000ff;">def</span> format(self, *args, **kwargs): <span style="color: #008000;">#</span><span style="color: #008000;"> known special case of str.format</span>
    <span style="color: #800000;">"""</span><span style="color: #800000;">
    格式化输出
    三种形式：
    形式一.
    &gt;&gt;&gt; print('{0}{1}{0}'.format('a','b'))
    aba

    形式二：（必须一一对应）
    &gt;&gt;&gt; print('{}{}{}'.format('a','b'))
    Traceback (most recent call last):
      File "&lt;input&gt;", line 1, in &lt;module&gt;
    IndexError: tuple index out of range
    &gt;&gt;&gt; print('{}{}'.format('a','b'))
    ab

    形式三：
    &gt;&gt;&gt; print('{name} {age}'.format(age=12,name='lhf'))
    lhf 12

    S.format(*args, **kwargs) -&gt; str

    Return a formatted version of S, using substitutions from args and kwargs.
    The substitutions are identified by braces ('{' and '}').
    </span><span style="color: #800000;">"""</span>
    <span style="color: #0000ff;">pass</span>

<span style="color: #0000ff;">def</span> format_map(self, mapping): <span style="color: #008000;">#</span><span style="color: #008000;"> real signature unknown; restored from __doc__</span>
    <span style="color: #800000;">"""</span><span style="color: #800000;">
    与format区别
    '{name}'.format(**dict(name='alex'))
    '{name}'.format_map(dict(name='alex'))

    S.format_map(mapping) -&gt; str

    Return a formatted version of S, using substitutions from mapping.
    The substitutions are identified by braces ('{' and '}').
    </span><span style="color: #800000;">"""</span>
    <span style="color: #0000ff;">return</span> <span style="color: #800000;">""</span>

<span style="color: #0000ff;">def</span> index(self, sub, start=None, end=None): <span style="color: #008000;">#</span><span style="color: #008000;"> real signature unknown; restored from __doc__</span>
    <span style="color: #800000;">"""</span><span style="color: #800000;">
    S.index(sub[, start[, end]]) -&gt; int

    Like S.find() but raise ValueError when the substring is not found.
    </span><span style="color: #800000;">"""</span>
    <span style="color: #0000ff;">return</span><span style="color: #000000;"> 0

</span><span style="color: #0000ff;">def</span> isalnum(self): <span style="color: #008000;">#</span><span style="color: #008000;"> real signature unknown; restored from __doc__</span>
    <span style="color: #800000;">"""</span><span style="color: #800000;">
    至少一个字符，且都是字母或数字才返回True

    S.isalnum() -&gt; bool

    Return True if all characters in S are alphanumeric
    and there is at least one character in S, False otherwise.
    </span><span style="color: #800000;">"""</span>
    <span style="color: #0000ff;">return</span><span style="color: #000000;"> False

</span><span style="color: #0000ff;">def</span> isalpha(self): <span style="color: #008000;">#</span><span style="color: #008000;"> real signature unknown; restored from __doc__</span>
    <span style="color: #800000;">"""</span><span style="color: #800000;">
    至少一个字符，且都是字母才返回True
    S.isalpha() -&gt; bool

    Return True if all characters in S are alphabetic
    and there is at least one character in S, False otherwise.
    </span><span style="color: #800000;">"""</span>
    <span style="color: #0000ff;">return</span><span style="color: #000000;"> False

</span><span style="color: #0000ff;">def</span> isdecimal(self): <span style="color: #008000;">#</span><span style="color: #008000;"> real signature unknown; restored from __doc__</span>
    <span style="color: #800000;">"""</span><span style="color: #800000;">
    S.isdecimal() -&gt; bool

    Return True if there are only decimal characters in S,
    False otherwise.
    </span><span style="color: #800000;">"""</span>
    <span style="color: #0000ff;">return</span><span style="color: #000000;"> False

</span><span style="color: #0000ff;">def</span> isdigit(self): <span style="color: #008000;">#</span><span style="color: #008000;"> real signature unknown; restored from __doc__</span>
    <span style="color: #800000;">"""</span><span style="color: #800000;">
    S.isdigit() -&gt; bool

    Return True if all characters in S are digits
    and there is at least one character in S, False otherwise.
    </span><span style="color: #800000;">"""</span>
    <span style="color: #0000ff;">return</span><span style="color: #000000;"> False

</span><span style="color: #0000ff;">def</span> isidentifier(self): <span style="color: #008000;">#</span><span style="color: #008000;"> real signature unknown; restored from __doc__</span>
    <span style="color: #800000;">"""</span><span style="color: #800000;">
    字符串为关键字返回True

    S.isidentifier() -&gt; bool

    Return True if S is a valid identifier according
    to the language definition.

    Use keyword.iskeyword() to test for reserved identifiers
    such as "def" and "class".
    </span><span style="color: #800000;">"""</span>
    <span style="color: #0000ff;">return</span><span style="color: #000000;"> False

</span><span style="color: #0000ff;">def</span> islower(self): <span style="color: #008000;">#</span><span style="color: #008000;"> real signature unknown; restored from __doc__</span>
    <span style="color: #800000;">"""</span><span style="color: #800000;">
    至少一个字符，且都是小写字母才返回True
    S.islower() -&gt; bool

    Return True if all cased characters in S are lowercase and there is
    at least one cased character in S, False otherwise.
    </span><span style="color: #800000;">"""</span>
    <span style="color: #0000ff;">return</span><span style="color: #000000;"> False

</span><span style="color: #0000ff;">def</span> isnumeric(self): <span style="color: #008000;">#</span><span style="color: #008000;"> real signature unknown; restored from __doc__</span>
    <span style="color: #800000;">"""</span><span style="color: #800000;">
    S.isnumeric() -&gt; bool

    Return True if there are only numeric characters in S,
    False otherwise.
    </span><span style="color: #800000;">"""</span>
    <span style="color: #0000ff;">return</span><span style="color: #000000;"> False

</span><span style="color: #0000ff;">def</span> isprintable(self): <span style="color: #008000;">#</span><span style="color: #008000;"> real signature unknown; restored from __doc__</span>
    <span style="color: #800000;">"""</span><span style="color: #800000;">
    S.isprintable() -&gt; bool

    Return True if all characters in S are considered
    printable in repr() or S is empty, False otherwise.
    </span><span style="color: #800000;">"""</span>
    <span style="color: #0000ff;">return</span><span style="color: #000000;"> False

</span><span style="color: #0000ff;">def</span> isspace(self): <span style="color: #008000;">#</span><span style="color: #008000;"> real signature unknown; restored from __doc__</span>
    <span style="color: #800000;">"""</span><span style="color: #800000;">
    至少一个字符，且都是空格才返回True
    S.isspace() -&gt; bool

    Return True if all characters in S are whitespace
    and there is at least one character in S, False otherwise.
    </span><span style="color: #800000;">"""</span>
    <span style="color: #0000ff;">return</span><span style="color: #000000;"> False

</span><span style="color: #0000ff;">def</span> istitle(self): <span style="color: #008000;">#</span><span style="color: #008000;"> real signature unknown; restored from __doc__</span>
    <span style="color: #800000;">"""</span><span style="color: #800000;">
    &gt;&gt;&gt; a='Hello'
    &gt;&gt;&gt; a.istitle()
    True
    &gt;&gt;&gt; a='HellP'
    &gt;&gt;&gt; a.istitle()
    False

    S.istitle() -&gt; bool

    Return True if S is a titlecased string and there is at least one
    character in S, i.e. upper- and titlecase characters may only
    follow uncased characters and lowercase characters only cased ones.
    Return False otherwise.
    </span><span style="color: #800000;">"""</span>
    <span style="color: #0000ff;">return</span><span style="color: #000000;"> False

</span><span style="color: #0000ff;">def</span> isupper(self): <span style="color: #008000;">#</span><span style="color: #008000;"> real signature unknown; restored from __doc__</span>
    <span style="color: #800000;">"""</span><span style="color: #800000;">
    S.isupper() -&gt; bool

    Return True if all cased characters in S are uppercase and there is
    at least one cased character in S, False otherwise.
    </span><span style="color: #800000;">"""</span>
    <span style="color: #0000ff;">return</span><span style="color: #000000;"> False

</span><span style="color: #0000ff;">def</span> join(self, iterable): <span style="color: #008000;">#</span><span style="color: #008000;"> real signature unknown; restored from __doc__</span>
    <span style="color: #800000;">"""</span><span style="color: #800000;">
    #对序列进行操作（分别使用' '与':'作为分隔符）
    &gt;&gt;&gt; seq1 = ['hello','good','boy','doiido']
    &gt;&gt;&gt; print ' '.join(seq1)
    hello good boy doiido
    &gt;&gt;&gt; print ':'.join(seq1)
    hello:good:boy:doiido


    #对字符串进行操作

    &gt;&gt;&gt; seq2 = "hello good boy doiido"
    &gt;&gt;&gt; print ':'.join(seq2)
    h:e:l:l:o: :g:o:o:d: :b:o:y: :d:o:i:i:d:o


    #对元组进行操作

    &gt;&gt;&gt; seq3 = ('hello','good','boy','doiido')
    &gt;&gt;&gt; print ':'.join(seq3)
    hello:good:boy:doiido


    #对字典进行操作

    &gt;&gt;&gt; seq4 = {'hello':1,'good':2,'boy':3,'doiido':4}
    &gt;&gt;&gt; print ':'.join(seq4)
    boy:good:doiido:hello


    #合并目录

    &gt;&gt;&gt; import os
    &gt;&gt;&gt; os.path.join('/hello/','good/boy/','doiido')
    '/hello/good/boy/doiido'


    S.join(iterable) -&gt; str

    Return a string which is the concatenation of the strings in the
    iterable.  The separator between elements is S.
    </span><span style="color: #800000;">"""</span>
    <span style="color: #0000ff;">return</span> <span style="color: #800000;">""</span>

<span style="color: #0000ff;">def</span> ljust(self, width, fillchar=None): <span style="color: #008000;">#</span><span style="color: #008000;"> real signature unknown; restored from __doc__</span>
    <span style="color: #800000;">"""</span><span style="color: #800000;">
    S.ljust(width[, fillchar]) -&gt; str

    Return S left-justified in a Unicode string of length width. Padding is
    done using the specified fill character (default is a space).
    </span><span style="color: #800000;">"""</span>
    <span style="color: #0000ff;">return</span> <span style="color: #800000;">""</span>

<span style="color: #0000ff;">def</span> lower(self): <span style="color: #008000;">#</span><span style="color: #008000;"> real signature unknown; restored from __doc__</span>
    <span style="color: #800000;">"""</span><span style="color: #800000;">
    S.lower() -&gt; str

    Return a copy of the string S converted to lowercase.
    </span><span style="color: #800000;">"""</span>
    <span style="color: #0000ff;">return</span> <span style="color: #800000;">""</span>

<span style="color: #0000ff;">def</span> lstrip(self, chars=None): <span style="color: #008000;">#</span><span style="color: #008000;"> real signature unknown; restored from __doc__</span>
    <span style="color: #800000;">"""</span><span style="color: #800000;">
    S.lstrip([chars]) -&gt; str

    Return a copy of the string S with leading whitespace removed.
    If chars is given and not None, remove characters in chars instead.
    </span><span style="color: #800000;">"""</span>
    <span style="color: #0000ff;">return</span> <span style="color: #800000;">""</span>

<span style="color: #0000ff;">def</span> maketrans(self, *args, **kwargs): <span style="color: #008000;">#</span><span style="color: #008000;"> real signature unknown</span>
    <span style="color: #800000;">"""</span><span style="color: #800000;">
    Return a translation table usable for str.translate().

    If there is only one argument, it must be a dictionary mapping Unicode
    ordinals (integers) or characters to Unicode ordinals, strings or None.
    Character keys will be then converted to ordinals.
    If there are two arguments, they must be strings of equal length, and
    in the resulting dictionary, each character in x will be mapped to the
    character at the same position in y. If there is a third argument, it
    must be a string, whose characters will be mapped to None in the result.
    </span><span style="color: #800000;">"""</span>
    <span style="color: #0000ff;">pass</span>

<span style="color: #0000ff;">def</span> partition(self, sep): <span style="color: #008000;">#</span><span style="color: #008000;"> real signature unknown; restored from __doc__</span>
    <span style="color: #800000;">"""</span><span style="color: #800000;">
    以sep为分割，将S分成head,sep,tail三部分

    S.partition(sep) -&gt; (head, sep, tail)

    Search for the separator sep in S, and return the part before it,
    the separator itself, and the part after it.  If the separator is not
    found, return S and two empty strings.
    </span><span style="color: #800000;">"""</span>
    <span style="color: #0000ff;">pass</span>

<span style="color: #0000ff;">def</span> replace(self, old, new, count=None): <span style="color: #008000;">#</span><span style="color: #008000;"> real signature unknown; restored from __doc__</span>
    <span style="color: #800000;">"""</span><span style="color: #800000;">
    S.replace(old, new[, count]) -&gt; str

    Return a copy of S with all occurrences of substring
    old replaced by new.  If the optional argument count is
    given, only the first count occurrences are replaced.
    </span><span style="color: #800000;">"""</span>
    <span style="color: #0000ff;">return</span> <span style="color: #800000;">""</span>

<span style="color: #0000ff;">def</span> rfind(self, sub, start=None, end=None): <span style="color: #008000;">#</span><span style="color: #008000;"> real signature unknown; restored from __doc__</span>
    <span style="color: #800000;">"""</span><span style="color: #800000;">
    S.rfind(sub[, start[, end]]) -&gt; int

    Return the highest index in S where substring sub is found,
    such that sub is contained within S[start:end].  Optional
    arguments start and end are interpreted as in slice notation.

    Return -1 on failure.
    </span><span style="color: #800000;">"""</span>
    <span style="color: #0000ff;">return</span><span style="color: #000000;"> 0

</span><span style="color: #0000ff;">def</span> rindex(self, sub, start=None, end=None): <span style="color: #008000;">#</span><span style="color: #008000;"> real signature unknown; restored from __doc__</span>
    <span style="color: #800000;">"""</span><span style="color: #800000;">
    S.rindex(sub[, start[, end]]) -&gt; int

    Like S.rfind() but raise ValueError when the substring is not found.
    </span><span style="color: #800000;">"""</span>
    <span style="color: #0000ff;">return</span><span style="color: #000000;"> 0

</span><span style="color: #0000ff;">def</span> rjust(self, width, fillchar=None): <span style="color: #008000;">#</span><span style="color: #008000;"> real signature unknown; restored from __doc__</span>
    <span style="color: #800000;">"""</span><span style="color: #800000;">
    S.rjust(width[, fillchar]) -&gt; str

    Return S right-justified in a string of length width. Padding is
    done using the specified fill character (default is a space).
    </span><span style="color: #800000;">"""</span>
    <span style="color: #0000ff;">return</span> <span style="color: #800000;">""</span>

<span style="color: #0000ff;">def</span> rpartition(self, sep): <span style="color: #008000;">#</span><span style="color: #008000;"> real signature unknown; restored from __doc__</span>
    <span style="color: #800000;">"""</span><span style="color: #800000;">
    S.rpartition(sep) -&gt; (head, sep, tail)

    Search for the separator sep in S, starting at the end of S, and return
    the part before it, the separator itself, and the part after it.  If the
    separator is not found, return two empty strings and S.
    </span><span style="color: #800000;">"""</span>
    <span style="color: #0000ff;">pass</span>

<span style="color: #0000ff;">def</span> rsplit(self, sep=None, maxsplit=-1): <span style="color: #008000;">#</span><span style="color: #008000;"> real signature unknown; restored from __doc__</span>
    <span style="color: #800000;">"""</span><span style="color: #800000;">
    S.rsplit(sep=None, maxsplit=-1) -&gt; list of strings

    Return a list of the words in S, using sep as the
    delimiter string, starting at the end of the string and
    working to the front.  If maxsplit is given, at most maxsplit
    splits are done. If sep is not specified, any whitespace string
    is a separator.
    </span><span style="color: #800000;">"""</span>
    <span style="color: #0000ff;">return</span><span style="color: #000000;"> []

</span><span style="color: #0000ff;">def</span> rstrip(self, chars=None): <span style="color: #008000;">#</span><span style="color: #008000;"> real signature unknown; restored from __doc__</span>
    <span style="color: #800000;">"""</span><span style="color: #800000;">
    S.rstrip([chars]) -&gt; str

    Return a copy of the string S with trailing whitespace removed.
    If chars is given and not None, remove characters in chars instead.
    </span><span style="color: #800000;">"""</span>
    <span style="color: #0000ff;">return</span> <span style="color: #800000;">""</span>

<span style="color: #0000ff;">def</span> split(self, sep=None, maxsplit=-1): <span style="color: #008000;">#</span><span style="color: #008000;"> real signature unknown; restored from __doc__</span>
    <span style="color: #800000;">"""</span><span style="color: #800000;">
    以sep为分割，将S切分成列表，与partition的区别在于切分结果不包含sep，
    如果一个字符串中包含多个sep那么maxsplit为最多切分成几部分
    &gt;&gt;&gt; a='a,b c\nd\te'
    &gt;&gt;&gt; a.split()
    ['a,b', 'c', 'd', 'e']
    S.split(sep=None, maxsplit=-1) -&gt; list of strings

    Return a list of the words in S, using sep as the
    delimiter string.  If maxsplit is given, at most maxsplit
    splits are done. If sep is not specified or is None, any
    whitespace string is a separator and empty strings are
    removed from the result.
    </span><span style="color: #800000;">"""</span>
    <span style="color: #0000ff;">return</span><span style="color: #000000;"> []

</span><span style="color: #0000ff;">def</span> splitlines(self, keepends=None): <span style="color: #008000;">#</span><span style="color: #008000;"> real signature unknown; restored from __doc__</span>
    <span style="color: #800000;">"""</span><span style="color: #800000;">
    Python splitlines() 按照行('\r', '\r\n', \n')分隔，
    返回一个包含各行作为元素的列表，如果参数 keepends 为 False，不包含换行符，如        果为 True，则保留换行符。
    &gt;&gt;&gt; x
    'adsfasdf\nsadf\nasdf\nadf'
    &gt;&gt;&gt; x.splitlines()
    ['adsfasdf', 'sadf', 'asdf', 'adf']
    &gt;&gt;&gt; x.splitlines(True)
    ['adsfasdf\n', 'sadf\n', 'asdf\n', 'adf']

    S.splitlines([keepends]) -&gt; list of strings

    Return a list of the lines in S, breaking at line boundaries.
    Line breaks are not included in the resulting list unless keepends
    is given and true.
    </span><span style="color: #800000;">"""</span>
    <span style="color: #0000ff;">return</span><span style="color: #000000;"> []

</span><span style="color: #0000ff;">def</span> startswith(self, prefix, start=None, end=None): <span style="color: #008000;">#</span><span style="color: #008000;"> real signature unknown; restored from __doc__</span>
    <span style="color: #800000;">"""</span><span style="color: #800000;">
    S.startswith(prefix[, start[, end]]) -&gt; bool

    Return True if S starts with the specified prefix, False otherwise.
    With optional start, test S beginning at that position.
    With optional end, stop comparing S at that position.
    prefix can also be a tuple of strings to try.
    </span><span style="color: #800000;">"""</span>
    <span style="color: #0000ff;">return</span><span style="color: #000000;"> False

</span><span style="color: #0000ff;">def</span> strip(self, chars=None): <span style="color: #008000;">#</span><span style="color: #008000;"> real signature unknown; restored from __doc__</span>
    <span style="color: #800000;">"""</span><span style="color: #800000;">
    S.strip([chars]) -&gt; str

    Return a copy of the string S with leading and trailing
    whitespace removed.
    If chars is given and not None, remove characters in chars instead.
    </span><span style="color: #800000;">"""</span>
    <span style="color: #0000ff;">return</span> <span style="color: #800000;">""</span>

<span style="color: #0000ff;">def</span> swapcase(self): <span style="color: #008000;">#</span><span style="color: #008000;"> real signature unknown; restored from __doc__</span>
    <span style="color: #800000;">"""</span><span style="color: #800000;">
    大小写反转
    S.swapcase() -&gt; str

    Return a copy of S with uppercase characters converted to lowercase
    and vice versa.
    </span><span style="color: #800000;">"""</span>
    <span style="color: #0000ff;">return</span> <span style="color: #800000;">""</span>

<span style="color: #0000ff;">def</span> title(self): <span style="color: #008000;">#</span><span style="color: #008000;"> real signature unknown; restored from __doc__</span>
    <span style="color: #800000;">"""</span><span style="color: #800000;">
    S.title() -&gt; str

    Return a titlecased version of S, i.e. words start with title case
    characters, all remaining cased characters have lower case.
    </span><span style="color: #800000;">"""</span>
    <span style="color: #0000ff;">return</span> <span style="color: #800000;">""</span>

<span style="color: #0000ff;">def</span> translate(self, table): <span style="color: #008000;">#</span><span style="color: #008000;"> real signature unknown; restored from __doc__</span>
    <span style="color: #800000;">"""</span><span style="color: #800000;">
    table=str.maketrans('alex','big SB')

    a='hello abc'
    print(a.translate(table))

    S.translate(table) -&gt; str

    Return a copy of the string S in which each character has been mapped
    through the given translation table. The table must implement
    lookup/indexing via __getitem__, for instance a dictionary or list,
    mapping Unicode ordinals to Unicode ordinals, strings, or None. If
    this operation raises LookupError, the character is left untouched.
    Characters mapped to None are deleted.
    </span><span style="color: #800000;">"""</span>
    <span style="color: #0000ff;">return</span> <span style="color: #800000;">""</span>

<span style="color: #0000ff;">def</span> upper(self): <span style="color: #008000;">#</span><span style="color: #008000;"> real signature unknown; restored from __doc__</span>
    <span style="color: #800000;">"""</span><span style="color: #800000;">
    S.upper() -&gt; str

    Return a copy of S converted to uppercase.
    </span><span style="color: #800000;">"""</span>
    <span style="color: #0000ff;">return</span> <span style="color: #800000;">""</span>

<span style="color: #0000ff;">def</span> zfill(self, width): <span style="color: #008000;">#</span><span style="color: #008000;"> real signature unknown; restored from __doc__</span>
    <span style="color: #800000;">"""</span><span style="color: #800000;">
    原来字符右对齐，不够用0补齐
    
    S.zfill(width) -&gt; str

    Pad a numeric string S with zeros on the left, to fill a field
    of the specified width. The string S is never truncated.
    </span><span style="color: #800000;">"""</span>
    <span style="color: #0000ff;">return</span> <span style="color: #800000;">""</span>

<span style="color: #0000ff;">def</span> <span style="color: #800080;">__add__</span>(self, *args, **kwargs): <span style="color: #008000;">#</span><span style="color: #008000;"> real signature unknown</span>
    <span style="color: #800000;">"""</span><span style="color: #800000;"> Return self+value. </span><span style="color: #800000;">"""</span>
    <span style="color: #0000ff;">pass</span>

<span style="color: #0000ff;">def</span> <span style="color: #800080;">__contains__</span>(self, *args, **kwargs): <span style="color: #008000;">#</span><span style="color: #008000;"> real signature unknown</span>
    <span style="color: #800000;">"""</span><span style="color: #800000;"> Return key in self. </span><span style="color: #800000;">"""</span>
    <span style="color: #0000ff;">pass</span>

<span style="color: #0000ff;">def</span> <span style="color: #800080;">__eq__</span>(self, *args, **kwargs): <span style="color: #008000;">#</span><span style="color: #008000;"> real signature unknown</span>
    <span style="color: #800000;">"""</span><span style="color: #800000;"> Return self==value. </span><span style="color: #800000;">"""</span>
    <span style="color: #0000ff;">pass</span>

<span style="color: #0000ff;">def</span> <span style="color: #800080;">__format__</span>(self, format_spec): <span style="color: #008000;">#</span><span style="color: #008000;"> real signature unknown; restored from __doc__</span>
    <span style="color: #800000;">"""</span><span style="color: #800000;">
    S.__format__(format_spec) -&gt; str

    Return a formatted version of S as described by format_spec.
    </span><span style="color: #800000;">"""</span>
    <span style="color: #0000ff;">return</span> <span style="color: #800000;">""</span>

<span style="color: #0000ff;">def</span> <span style="color: #800080;">__getattribute__</span>(self, *args, **kwargs): <span style="color: #008000;">#</span><span style="color: #008000;"> real signature unknown</span>
    <span style="color: #800000;">"""</span><span style="color: #800000;"> Return getattr(self, name). </span><span style="color: #800000;">"""</span>
    <span style="color: #0000ff;">pass</span>

<span style="color: #0000ff;">def</span> <span style="color: #800080;">__getitem__</span>(self, *args, **kwargs): <span style="color: #008000;">#</span><span style="color: #008000;"> real signature unknown</span>
    <span style="color: #800000;">"""</span><span style="color: #800000;"> Return self[key]. </span><span style="color: #800000;">"""</span>
    <span style="color: #0000ff;">pass</span>

<span style="color: #0000ff;">def</span> <span style="color: #800080;">__getnewargs__</span>(self, *args, **kwargs): <span style="color: #008000;">#</span><span style="color: #008000;"> real signature unknown</span>
    <span style="color: #0000ff;">pass</span>

<span style="color: #0000ff;">def</span> <span style="color: #800080;">__ge__</span>(self, *args, **kwargs): <span style="color: #008000;">#</span><span style="color: #008000;"> real signature unknown</span>
    <span style="color: #800000;">"""</span><span style="color: #800000;"> Return self&gt;=value. </span><span style="color: #800000;">"""</span>
    <span style="color: #0000ff;">pass</span>

<span style="color: #0000ff;">def</span> <span style="color: #800080;">__gt__</span>(self, *args, **kwargs): <span style="color: #008000;">#</span><span style="color: #008000;"> real signature unknown</span>
    <span style="color: #800000;">"""</span><span style="color: #800000;"> Return self&gt;value. </span><span style="color: #800000;">"""</span>
    <span style="color: #0000ff;">pass</span>

<span style="color: #0000ff;">def</span> <span style="color: #800080;">__hash__</span>(self, *args, **kwargs): <span style="color: #008000;">#</span><span style="color: #008000;"> real signature unknown</span>
    <span style="color: #800000;">"""</span><span style="color: #800000;"> Return hash(self). </span><span style="color: #800000;">"""</span>
    <span style="color: #0000ff;">pass</span>

<span style="color: #0000ff;">def</span> <span style="color: #800080;">__init__</span>(self, value=<span style="color: #800000;">''</span>, encoding=None, errors=<span style="color: #800000;">'</span><span style="color: #800000;">strict</span><span style="color: #800000;">'</span>): <span style="color: #008000;">#</span><span style="color: #008000;"> known special case of str.__init__</span>
    <span style="color: #800000;">"""</span><span style="color: #800000;">
    str(object='') -&gt; str
    str(bytes_or_buffer[, encoding[, errors]]) -&gt; str

    Create a new string object from the given object. If encoding or
    errors is specified, then the object must expose a data buffer
    that will be decoded using the given encoding and error handler.
    Otherwise, returns the result of object.__str__() (if defined)
    or repr(object).
    encoding defaults to sys.getdefaultencoding().
    errors defaults to 'strict'.
    # (copied from class doc)
    </span><span style="color: #800000;">"""</span>
    <span style="color: #0000ff;">pass</span>

<span style="color: #0000ff;">def</span> <span style="color: #800080;">__iter__</span>(self, *args, **kwargs): <span style="color: #008000;">#</span><span style="color: #008000;"> real signature unknown</span>
    <span style="color: #800000;">"""</span><span style="color: #800000;"> Implement iter(self). </span><span style="color: #800000;">"""</span>
    <span style="color: #0000ff;">pass</span>

<span style="color: #0000ff;">def</span> <span style="color: #800080;">__len__</span>(self, *args, **kwargs): <span style="color: #008000;">#</span><span style="color: #008000;"> real signature unknown</span>
    <span style="color: #800000;">"""</span><span style="color: #800000;"> Return len(self). </span><span style="color: #800000;">"""</span>
    <span style="color: #0000ff;">pass</span>

<span style="color: #0000ff;">def</span> <span style="color: #800080;">__le__</span>(self, *args, **kwargs): <span style="color: #008000;">#</span><span style="color: #008000;"> real signature unknown</span>
    <span style="color: #800000;">"""</span><span style="color: #800000;"> Return self&lt;=value. </span><span style="color: #800000;">"""</span>
    <span style="color: #0000ff;">pass</span>

<span style="color: #0000ff;">def</span> <span style="color: #800080;">__lt__</span>(self, *args, **kwargs): <span style="color: #008000;">#</span><span style="color: #008000;"> real signature unknown</span>
    <span style="color: #800000;">"""</span><span style="color: #800000;"> Return self&lt;value. </span><span style="color: #800000;">"""</span>
    <span style="color: #0000ff;">pass</span>

<span style="color: #0000ff;">def</span> <span style="color: #800080;">__mod__</span>(self, *args, **kwargs): <span style="color: #008000;">#</span><span style="color: #008000;"> real signature unknown</span>
    <span style="color: #800000;">"""</span><span style="color: #800000;"> Return self%value. </span><span style="color: #800000;">"""</span>
    <span style="color: #0000ff;">pass</span>

<span style="color: #0000ff;">def</span> <span style="color: #800080;">__mul__</span>(self, *args, **kwargs): <span style="color: #008000;">#</span><span style="color: #008000;"> real signature unknown</span>
    <span style="color: #800000;">"""</span><span style="color: #800000;"> Return self*value.n </span><span style="color: #800000;">"""</span>
    <span style="color: #0000ff;">pass</span><span style="color: #000000;">

@staticmethod </span><span style="color: #008000;">#</span><span style="color: #008000;"> known case of __new__</span>
<span style="color: #0000ff;">def</span> <span style="color: #800080;">__new__</span>(*args, **kwargs): <span style="color: #008000;">#</span><span style="color: #008000;"> real signature unknown</span>
    <span style="color: #800000;">"""</span><span style="color: #800000;"> Create and return a new object.  See help(type) for accurate signature. </span><span style="color: #800000;">"""</span>
    <span style="color: #0000ff;">pass</span>

<span style="color: #0000ff;">def</span> <span style="color: #800080;">__ne__</span>(self, *args, **kwargs): <span style="color: #008000;">#</span><span style="color: #008000;"> real signature unknown</span>
    <span style="color: #800000;">"""</span><span style="color: #800000;"> Return self!=value. </span><span style="color: #800000;">"""</span>
    <span style="color: #0000ff;">pass</span>

<span style="color: #0000ff;">def</span> <span style="color: #800080;">__repr__</span>(self, *args, **kwargs): <span style="color: #008000;">#</span><span style="color: #008000;"> real signature unknown</span>
    <span style="color: #800000;">"""</span><span style="color: #800000;"> Return repr(self). </span><span style="color: #800000;">"""</span>
    <span style="color: #0000ff;">pass</span>

<span style="color: #0000ff;">def</span> <span style="color: #800080;">__rmod__</span>(self, *args, **kwargs): <span style="color: #008000;">#</span><span style="color: #008000;"> real signature unknown</span>
    <span style="color: #800000;">"""</span><span style="color: #800000;"> Return value%self. </span><span style="color: #800000;">"""</span>
    <span style="color: #0000ff;">pass</span>

<span style="color: #0000ff;">def</span> <span style="color: #800080;">__rmul__</span>(self, *args, **kwargs): <span style="color: #008000;">#</span><span style="color: #008000;"> real signature unknown</span>
    <span style="color: #800000;">"""</span><span style="color: #800000;"> Return self*value. </span><span style="color: #800000;">"""</span>
    <span style="color: #0000ff;">pass</span>

<span style="color: #0000ff;">def</span> <span style="color: #800080;">__sizeof__</span>(self): <span style="color: #008000;">#</span><span style="color: #008000;"> real signature unknown; restored from __doc__</span>
    <span style="color: #800000;">"""</span><span style="color: #800000;"> S.__sizeof__() -&gt; size of S in memory, in bytes </span><span style="color: #800000;">"""</span>
    <span style="color: #0000ff;">pass</span>

<span style="color: #0000ff;">def</span> <span style="color: #800080;">__str__</span>(self, *args, **kwargs): <span style="color: #008000;">#</span><span style="color: #008000;"> real signature unknown</span>
    <span style="color: #800000;">"""</span><span style="color: #800000;"> Return str(self). </span><span style="color: #800000;">"""</span>
    <span style="color: #0000ff;">pass</span></pre>

字符串工厂函数

posted @ 2019-09-16 18:22 若如初见_you 阅读(2596) 评论(0) 编辑收藏举报

若如初见_you

基本数据类型（数字&字符串）

1.python中的数据类型

2.标准数据类型

2.1 数字

2.1.1 整形

2.1.2 bool型

2.1.3 float型

2.1.4 comple型

2.1.5 数字相关内建函数

2.2 字符串

2.2.1 定义与特性

2.2.2 字符串的创建与常用操作

2.2.3 str字符串工厂函数

公告

　2.1 数字