第十五节，基本数据类型，元组tuple

元组和列表的区别

　　元组和列表几乎是一样的

　　不一样的地方就是元组创建后元组的元素不可以修改，比如（添加，拓展，移除等修改功能，但是元组里的元素的元素是可以修改的）

基本操作：
　　索引
　　切片
　　循环
　　长度
　　包含

 

创建元组

#!/usr/bin/env python
# -*- coding:utf-8 -*-
a = ("lyh", "guixiu", "xioum")
#或者
b = tuple(("lyh", "guixiu", "xioum"))

 

tuple转换元组
"""(转换成元组，需要转换的可迭代数据变量) 注意：能转换成元组的必须是可迭代的，也就是可以被for循环的"""
字符串，字典，列表 > 都可以转换成元组，转换成元组都是可以被for循环的，for循环每次循环到的数据就是元组的一个元素

#!/usr/bin/env python
# -*- coding:utf-8 -*-
a = "小鸡炖蘑菇"
b = tuple(a)
print(b)
#输出 ('小', '鸡', '炖', '蘑', '菇')

 

索引

　　格式：元组变量加[索引下标] 的方式

#!/usr/bin/env python
# -*- coding:utf-8 -*-
a = ("lyh", "guixiu", "xioum")
print(a[1])
#打印出 guixiu 打印出元素下标为1的元素

切片
　　格式：元组变量加[起始下标：结束下标]

#!/usr/bin/env python
# -*- coding:utf-8 -*-
a = ("lyh", "guixiu", "xioum")
print(a[0:3])
#打印出 ('lyh', 'guixiu', 'xioum') 打印出元素下标0到3的元素

　　len(p_object)

　　"""(统计元组里的元素数量)"""

#!/usr/bin/env python
# -*- coding:utf-8 -*-
a = ("lyh", "guixiu", "xioum")
print(len(a))
#打印出 3 统计出元组里有3个元素

　　while循环

#!/usr/bin/env python
# -*- coding:utf-8 -*-
#while循环
a = ("lyh", "guixiu", "xioum")
b = 0
while b < len(a):
    print(a[b])
    b += 1
#循环出元组里的所有元素

　　for循环

#!/usr/bin/env python
# -*- coding:utf-8 -*-
#for循环
a = ("lyh", "guixiu", "xioum")
for b in a: #b为自定义循环变量
    print(b)
#循环出元组里的所有元素

　　count(self, value)

　　"""(计算元素在元组里出现的次数)"""要计算的元素

#!/usr/bin/env python
# -*- coding:utf-8 -*-
a = ("lyh", "guixiu", "xioum")
print(a.count("guixiu"))
#打印出 1 guixiu元素在元组里出现一次

　　index(self, value, start=None, stop=None)

　　"""(获取指定元素在元组里的索引位置)"""要查找的元素，起始位置，结束位置

#!/usr/bin/env python
# -*- coding:utf-8 -*-
a = ("lyh", "guixiu", "xioum")
print(a.index("guixiu"))
#打印出 1 guixiu元素在元组里的索引位置是1，默认从0开始计算

lass 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, y): # real signature unknown; restored from __doc__
        """ x.__add__(y) <==> x+y """
        pass

    def __contains__(self, y): # real signature unknown; restored from __doc__
        """ x.__contains__(y) <==> y in x """
        pass

    def __eq__(self, y): # real signature unknown; restored from __doc__
        """ x.__eq__(y) <==> x==y """
        pass

    def __getattribute__(self, name): # real signature unknown; restored from __doc__
        """ x.__getattribute__('name') <==> x.name """
        pass

    def __getitem__(self, y): # real signature unknown; restored from __doc__
        """ x.__getitem__(y) <==> x[y] """
        pass

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

    def __getslice__(self, i, j): # real signature unknown; restored from __doc__
        """
        x.__getslice__(i, j) <==> x[i:j]
                   
                   Use of negative indices is not supported.
        """
        pass

    def __ge__(self, y): # real signature unknown; restored from __doc__
        """ x.__ge__(y) <==> x>=y """
        pass

    def __gt__(self, y): # real signature unknown; restored from __doc__
        """ x.__gt__(y) <==> x>y """
        pass

    def __hash__(self): # real signature unknown; restored from __doc__
        """ x.__hash__() <==> hash(x) """
        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): # real signature unknown; restored from __doc__
        """ x.__iter__() <==> iter(x) """
        pass

    def __len__(self): # real signature unknown; restored from __doc__
        """ x.__len__() <==> len(x) """
        pass

    def __le__(self, y): # real signature unknown; restored from __doc__
        """ x.__le__(y) <==> x<=y """
        pass

    def __lt__(self, y): # real signature unknown; restored from __doc__
        """ x.__lt__(y) <==> x<y """
        pass

    def __mul__(self, n): # real signature unknown; restored from __doc__
        """ x.__mul__(n) <==> x*n """
        pass

    @staticmethod # known case of __new__
    def __new__(S, *more): # real signature unknown; restored from __doc__
        """ T.__new__(S, ...) -> a new object with type S, a subtype of T """
        pass

    def __ne__(self, y): # real signature unknown; restored from __doc__
        """ x.__ne__(y) <==> x!=y """
        pass

    def __repr__(self): # real signature unknown; restored from __doc__
        """ x.__repr__() <==> repr(x) """
        pass

    def __rmul__(self, n): # real signature unknown; restored from __doc__
        """ x.__rmul__(n) <==> n*x """
        pass

    def __sizeof__(self): # real signature unknown; restored from __doc__
        """ T.__sizeof__() -- size of T in memory, in bytes """
        pass

 

元组里的元素的元素追加
元组的元素是不可修改和和追加的，也就是元组的子级不可修改，元组的元素的元素也就是孙级是可以修改的

#!/usr/bin/env python
# -*- coding:utf-8 -*-
#元组里的元素的元素追加
#元组的元素是不可修改和和追加的，也就是元组的子级不可修改，元组的元素的元素也就是孙级是可以修改的
#追加方式
#列1
a = (11,22,["guixiu",{"k1":"k2"}])
b = {"k3":"k4"}
a[2][1].update(b)#索引到元组里字典时，将b元组最佳进去
print(a)
#输出  (11, 22, ['guixiu', {'k1': 'k2', 'k3': 'k4'}])

#列2
a = (11,22,["guixiu",{"k1":"k2"}])
c = a[2][1]#索引到元组里的字典
c["k3"] = "k4"
print(a)
#输出  (11, 22, ['guixiu', {'k1': 'k2', 'k3': 'k4'}])

 

元组的功能

转换列表
索引
切片
for循环
长度
反转
排序
索引位置
统计元素个数