str实例

def capitalize(self)  首字母变大写
str1 = 'wanguyg'
result = str1.capitalize()
print(result)
>>>Wanguyg


def center(self, width, fillchar=None) 内容居中，width：总长度；fillchar：空白处填充内容，默认无
str1 = 'wanguyg'
result = str1.center(20,"*")
print(result)
>>>******wanguyg*******

def count(self, sub, start=None, end=None)
str1 = 'wanguyg'  子序列个数
sub = 'g'
result = str1.count(sub,4,20)
print(result)
>>>1


def encode(self, encoding=None, errors=None) 编码，针对unicode
str1 = 'wanguyg'
result = str1.encode(encoding='UTF-8',errors='strict')
print(result)
>>>b'wanguyg'

def endswith(self, suffix, start=None, end=None):是否以 xxx 结尾
str1 = 'wanguyg is super man'
suffix = 'man'
result = str1.endswith(suffix,0,10)
print(result)
>>>False


def expandtabs(self, tabsize=None)tabs在字符串表示中用\t表示,expandtabs（6），则表示6个占一位。可做一个类似表格的东西
str2 = 'wanguyg is best\thahhahaha';
print ("你好，大神 "+ str2.expandtabs(tabsize=64))
>>>你好,kk wanguyg is dddd                                                 hahhahaha

def find(self, sub, start=None, end=None)
寻找子序列位置，如果没找到，返回 -1,从开始往后找，找到第一个之后，获得其位置
str1 = 'wanguyg'
sub = 'g'
result = str1.find(sub,3,6)
print(result)
>>>3

def format(self, *args, **kwargs)# 格式化，将一个字符串的占位符替换为指定的值
test = 'i am {name},age {a}'
print(test)
v = test.format(name="alex",a=19)
print(v)
>>>i am {name},age {a}
>>>i am alex,age 19

def format_map() # 格式化，传入的值{"name":'alex','a':'19'}字典格式
test = 'i am {name},age {a}'
v2 = test.format_map({"name":'alex','a':'19'})
print(v2)
>>>i am alex,age 19def index(self, sub, start=None, end=None):#index找不到报错
str1 = 'wanguyg is verry nice'
sub = 'is'
result = str1.index(sub,1,10)
print(result)
>>>8

def isalnum(self) 是否只是包含字母和数字 ,都有则False，单独则True
str1 = 'hdfghm 765'
result = str1.isalnum()
print(result)
>>>False

def isalpha(self): 是否是字母
str1 = 'gf'
result = str1.isalpha()
print(result)
>>>True

def isidentifier()
#字母、数字、下划线、：标识符 def class
a = "def"
v = a.isidentifier()
print(v)
>>>True

def isdigit(self) 是否是数字
str1 = '345'
result = str1.isdigit()#更nb
result = str1.isdecimal()#10进制数
result = str1.isnumseric()
print(result)
>>>True

def islower(self): 是否小写
str1 = 'wRanguyg'
result = str1.islower()
print(result)
>>>False

def isprintable()(self):包含到不可显示的字符\t  \n等
str1 = '二'
v = str1.isprintable()
print(v)
>>>True

def isspace(self): 是否为空格字符
str1 = ' '
result = str1.isspace()
print(result)
>>>True

def istitle(self):
如果字符串中所有的单词拼写首字母是否为大写，且其他字母为小写则返回 True，否则返回 False.
str1 = 'Dfadsf Is Dfdjklf'
result = str1.istitle()
print(result)
>>>True

def isupper(self)
检测字符串中所有的字母是否都为大写
str1 = 'WANGQHDFSA'
result = str1.isupper()
print(result)
>>>True

def join(self, iterable) 将序列中的元素以指定的字符连接生成一个新的字符串。
str1 = '**'
seq = "ba","kd","fd"
result = str1.join(seq)
print(result)
>>>ba**kd**fd

def ljust(self, width, fillchar=None):
返回一个原字符串左对齐,并使用空格填充至指定长度的新字符串。如果指定的长度小于原字符串的长度则返回原字符串。
str1 = 'God is god fndjksafklasdjflkajdskl'
result = str1.ljust(40,'*')
print(result)
>>>God is god fndjksafklasdjflkajdskl******

def lower(self) 变小写
def islower()  是否是小写
def isupper()    是否是大写
def upper（）   变大写
str1 = 'FDSAFhjufds'
result = str1.lower()
print(result)
>>>fdsafhjufds

def lstrip(self, chars=None)   移除左侧空白，可移除换行，字符，能移除匹配到的子序列
def rstrip　　　　　　去除右边空白
def strip　　        去除两边空白

str1 = '         wanguyg    dfasf'
result = str1.lstrip()
print(str1)
print(result)

def partition(self, sep) 来根据指定的分隔符将字符串进行分割
str1 = 'wanguyg://hgjklas://fhskjadhfkj'
result = str1.partition('://')
print(result)
#
def replace(self, old, new, count=None):替换
str1 = 'wanguyg is good'
result = str1.replace('wang','haha')
print(result)

# def rfind(self, sub, start=None, end=None)从右往左找
sub = 'a'
str1 = 'wanguayg'
result = str1.rfind(sub,1,20)
print(result)

def rindex(self, sub, start=None, end=None)从右往左找
str1 = 'wanguyag'
sub = 'a'
result = str1.rindex(sub,1,20)
print(result)

def rjust(self, width, fillchar=None):
并使用空格填充至指定长度的新字符串左边。如果指定的长度小于原字符串的长度则返回原字符串。
str1 = 'wanguyg is fkdl'
result = str1.rjust(50)
print(result)

def rpartition(self, sep)从右到左通过特殊分隔符分割字符
sep = "://"
str1 = 'wanguyg://fdasfadsf://fdsafasd'
result = str1.rpartition(sep)
print(result)

def rsplit(self, sep=None, maxsplit=None) str转list
str1 = 'wanguyg isa'
result = str1.rsplit()
print(result)

def rstrip(self, chars=None
删除 string 字符串末尾的指定字符（默认为空格）.
str1 = "666 wanguy fadsf 666"
chars = '6'
result = str1.rstrip(chars)
print(result)

maketrans 和 translate一起用#对应做了替换
str1 = 'fasdfsadfasdf;fadsfsad;fadsfadsf'
m = str.maketrans("aeiou","12345")
new_j = str1.translate(m)
print(new_j)
>>>f1sdfs1df1sdf;f1dsfs1d;f1dsf1dsf

def split(self, sep=None, maxsplit=None)#用于分割
分割， maxsplit最多分割几次
str1 = 'wanguygfdasfaygsdfas'
sep = 'yg'
result = str1.split(sep,2)
print(result)
>>>['wangu', 'fdasfa', 'sdfas']

def splitlines(self, keepends=False) 根据换行分割
str1 = 'wan\n\nguy\ng'
result = str1.splitlines()
print(result)

def startswith(self, prefix, start=None, end=None): 是否起始
str1 = 'wanguyg is hfds'
prefix = 'wa'
result = str1.startswith(prefix)
print(result)

def strip(self, chars=None)  移除两段空白
str1 = '       wanguyg       '
str2 ='fdsafads'
result = str1.strip()+str2
print(result)

def swapcase(self):   大写变小写，小写变大写
str1 = 'wanguGGyg'
result = str1.swapcase()
print(result)

def title(self)  更改字符首字母为大写，设为标题格式
str1 = 'wanguyg ds'
result = str1.title()
print(result)

def translate(self, table) 3.5没测试出来!!!!
from string import maketrans
str1 = 'wanguyg'
str2 = '21342433'
trantab = maketrans(str1,str2)
str = 'this is string example...wow'
result = str1.translate(trantab,'xm')
print(result)

def upper(self): 小写转大写。大写还是大写
str1 = 'wangGuyg'
result = str1.upper()
print(result)

 def zfill(self, width)
方法返回指定长度的字符串，原字符串右对齐，前面填充0
str1 = 'wanguyg'
result = str1.zfill(20)
print(result)

d ef __add__(self, y) 附加字符
str1 = 'wanguyg'
result = str1.__add__('ffy')
print(result)

def __contains__(self, y)  判断是否有这个字符
str1 = 'wanguyg'
result = str1.__contains__('yg')
print(result)

def __eq__(self, y):判断两者是否相等
str1 = 'wanguyg'
result = str1.__eq__('wanguyg')
print(result)

__getattribute__ 没弄明白
str1 = 'wanguyg'
result = str1.__getattribute__()
print(result)
.
def __getitem__(self, y)  查询字典中的值
str1 = {'name':'wanguygdsds/dsadas'}
result = str1.__getitem__("name")
print(result)