自学Python2.3-基本数据类型-元组tuple(object) 方法

  • Z时代
  • 2024-01-10
  • 分类：综合

python

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

tuple源码

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

python;gutter:true;">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

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