腾讯课堂——基础数据类型(tuple元祖)

初识元祖

标准类型

数字

字符串

列表

字典

元组

 

 

 

 

 

 

 

 　　定义：与列表类似，只不过［］改成（）

　　特性：

　　　　1.可存放多个值
　　　　2.不可变
　　　　3.按照从左到右的顺序定义元组元素，下标从0开始顺序访问，有序

元祖的创建

　　ages = (11, 22, 33, 44, 55)
　　或
　　ages = tuple((11, 22, 33, 44, 55))
　　顺序及下标图示

元祖的常用操作

　　索引

　　切片　　

　　循环

　　长度

　　包含

元祖的特性详解

　　1.可存放多个值

　　　　如果元祖中只有一个值

t = (1,)
t = (1)   #<==>t = 1

　　　　元祖中不仅可以存放数字、字符串，还可以存放更加复杂的数据类型

　　2.不可变 

　　　　元祖本身不可变，如果元祖中还包含其他可变元素，这些可变元素可以改变

元祖相关知识拾遗

　　字典中遇到的tuple

 　　1.字典的定义

　　　　元祖可以作为字典的key：

dic = {('alex','male'):'v1',('wusir','male'):'v2'}
print(dic)

 　　　　字典定义可以用到元祖：

person = dict((['name','苑昊'],['文周',18]))
person = dict((('name','苑昊'),('文周',18)))
print(person)

 　　2.字典的items方法，将字典中的每一项作为元祖返回

dic = {'k1':'v1','k2':'v2'}
print(dic.items())
#dict_items([('k1', 'v1'), ('k2', 'v2')])

　　　　再讲循环

dic = {'key1':'value1','key2':'value2'}
for key,value in dic.items():
    print(key,value)

 

元祖的工厂函数

class tuple(object):
    """
    tuple() -> empty tuple
    tuple(iterable) -> tuple initialized from iterable's items
If the argument is a tuple, the return value is the same object.

"""

def count(self, value): # real signature unknown; restored from doc

""" T.count(value) -> integer -- return number of occurrences of value """

return 0
def index(self, value, start=None, stop=None): # real signature unknown; restored from doc

"""

T.index(value, [start, [stop]]) -> integer -- return first index of value.

Raises ValueError if the value is not present.

"""

return 0
def add(self, *args, **kwargs): # real signature unknown

""" Return self+value. """

pass
def contains(self, *args, **kwargs): # real signature unknown

""" Return key in self. """

pass
def eq(self, *args, **kwargs): # real signature unknown

""" Return self==value. """

pass
def getattribute(self, *args, **kwargs): # real signature unknown

""" Return getattr(self, name). """

pass
def getitem(self, *args, **kwargs): # real signature unknown

""" Return self[key]. """

pass
def getnewargs(self, *args, **kwargs): # real signature unknown

pass
def ge(self, *args, **kwargs): # real signature unknown

""" Return self>=value. """

pass
def gt(self, *args, **kwargs): # real signature unknown

""" Return self>value. """

pass
def hash(self, *args, **kwargs): # real signature unknown

""" Return hash(self). """

pass
def init(self, seq=()): # known special case of tuple.init

"""

tuple() -> empty tuple

tuple(iterable) -> tuple initialized from iterable's items
If the argument is a tuple, the return value is the same object.

# (copied from class doc)

"""

pass
def iter(self, *args, **kwargs): # real signature unknown

""" Implement iter(self). """

pass
def len(self, *args, **kwargs): # real signature unknown

""" Return len(self). """

pass
def le(self, *args, **kwargs): # real signature unknown

""" Return self<=value. """

pass
def lt(self, *args, **kwargs): # real signature unknown

""" Return self<value. """

pass
def mul(self, args, **kwargs): # real signature unknown

""" Return selfvalue.n """

pass
@staticmethod # known case of new

def new(*args, **kwargs): # real signature unknown

""" Create and return a new object.  See help(type) for accurate signature. """

pass
def ne(self, *args, **kwargs): # real signature unknown

""" Return self!=value. """

pass
def repr(self, *args, **kwargs): # real signature unknown

""" Return repr(self). """

pass
def rmul(self, args, **kwargs): # real signature unknown

""" Return selfvalue. """

pass