标签：__ real Python self pass 元组 kwargs def
Tuple 数据类型
一、如何创建元组
>>> t = (1, 2, 3, 'root')
>>> t
(1, 2, 3, 'root')
二、元组和列表的区别
- list是一种有序的集合，可以随时添加和删除其中的元素。
- 元组也是一种有序列表，和list非常类似，不同点是tuple一旦定义了就不可修改，在一定意义上这也提高了代码的安全性，查询方法和list一样
>>> dir(a)
['append', 'clear', 'copy', 'count', 'extend', 'index', 'insert', 'pop', 'remove', 'reverse', 'sort']
>>> dir(t)
['count', 'index']
>>> type(a)
<class 'list'>
>>> type(t)
<class 'tuple'>
tuple 函数方法
class tuple(object):
"""
Built-in immutable sequence.
If no argument is given, the constructor returns an empty tuple.
If iterable is specified the tuple is initialized from iterable's items.
If the argument is a tuple, the return value is the same object.
"""
def count(self, *args, **kwargs): # real signature unknown
""" Return number of occurrences of value. """
pass
def index(self, *args, **kwargs): # real signature unknown
"""
Return first index of value.
Raises ValueError if the value is not present.
"""
pass
def __add__(self, *args, **kwargs): # real signature unknown
""" Return self+value. """
pass
def __class_getitem__(self, *args, **kwargs): # real signature unknown
""" See PEP 585 """
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__
"""
Built-in immutable sequence.
If no argument is given, the constructor returns an empty tuple.
If iterable is specified the tuple is 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 self*value. """
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 value*self. """
pass
三、元组如何转换为列表
>>> list(t)
[1, 2, 3, 'root']
四、可变的tuple
# 当元祖内部放一个列表的时候，这个元祖中的列表的值就可以变化了，实际上tuple并没有改变，变的是内部list的值
>>> m = (1, 'A', ['root', 'gm'])
>>> m
(1, 'A', ['root', 'gm'])
# 查看元组第３个元素的值
>>> m[2]
['root', 'gm']
# 其查询列表和元组的数据结构类似与C语言中的１维数组和２维数组
>>> m[2][1]
'gm'
# 修改原列表第２个元素的值
>>> m[2][1]='hlr'
# 查看元组m
>>> m
(1, 'A', ['root', 'hlr'])
标签：__,
real,
Python,
self,
pass,
元组,
kwargs,
def
From： https://www.cnblogs.com/evescn/p/17469853.html