Python tuple方法总结 

一、元组的简介

1.元组与列表一样，也是一种序列，但是唯一不同的元组是不能修改的

2.元组的元素不可修改，但是元组元素的元素是可以修改的

3.元组通过()括起来表示   （1,2,3）

4.元组可以使用没有包含内容的()，表示空

二、 元组的方法

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 self*value.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 self*value. """
pass

1．count(self, value)，返回对象value在列表中出现的次数

tuple1=(1,2,3,4,5,6,3,8,444,3,)
result=tuple1.count(3)
print(result)

输出3

2.  index(self, value, start=None, stop=None)，返回列表中匹配对象value的第一个列表项的索引，无匹配元素时产生异常

tuple1=(1,2,3,4,5,6,3,8,444,3,)
result=tuple1.index(3)
print(result)

输出2　　

tuple1=(1,2,3,4,5,6,3,8,444,3,)
tuple1.append(99)
print(tuple1)

输出报错