python数据类型及其常用方法

1、整型 int

　　在32位机器上，整数的位数为32位，取值范围为-2**31～2**31-1，即-2147483648～2147483647
　　在64位系统上，整数的位数为64位，取值范围为-2**63～2**63-1，即-9223372036854775808～9223372036854775807

class set(object):
"""
set() -> new empty set object
set(iterable) -> new set object

Build an unordered collection of unique elements.
"""
def add(self, *args, **kwargs): # real signature unknown
"""
Add an element to a set，添加元素

This has no effect if the element is already present.
"""
pass

def clear(self, *args, **kwargs): # real signature unknown
""" Remove all elements from this set. 清除内容"""
pass

def copy(self, *args, **kwargs): # real signature unknown
""" Return a shallow copy of a set. 浅拷贝  """
pass

def difference(self, *args, **kwargs): # real signature unknown
"""
Return the difference of two or more sets as a new set. A中存在，B中不存在

(i.e. all elements that are in this set but not the others.)
"""
pass

def difference_update(self, *args, **kwargs): # real signature unknown
""" Remove all elements of another set from this set.  从当前集合中删除和B中相同的元素"""
pass

def discard(self, *args, **kwargs): # real signature unknown
"""
Remove an element from a set if it is a member.

If the element is not a member, do nothing. 移除指定元素，不存在不保错
"""
pass

def intersection(self, *args, **kwargs): # real signature unknown
"""
Return the intersection of two sets as a new set. 交集

(i.e. all elements that are in both sets.)
"""
pass

def intersection_update(self, *args, **kwargs): # real signature unknown
""" Update a set with the intersection of itself and another.  取交集并更更新到A中 """
pass

def isdisjoint(self, *args, **kwargs): # real signature unknown
""" Return True if two sets have a null intersection.  如果没有交集，返回True，否则返回False"""
pass

def issubset(self, *args, **kwargs): # real signature unknown
""" Report whether another set contains this set.  是否是子序列"""
pass

def issuperset(self, *args, **kwargs): # real signature unknown
""" Report whether this set contains another set. 是否是父序列"""
pass

def pop(self, *args, **kwargs): # real signature unknown
"""
Remove and return an arbitrary set element.
Raises KeyError if the set is empty. 移除元素
"""
pass

def remove(self, *args, **kwargs): # real signature unknown
"""
Remove an element from a set; it must be a member.

If the element is not a member, raise a KeyError. 移除指定元素，不存在保错
"""
pass

def symmetric_difference(self, *args, **kwargs): # real signature unknown
"""
Return the symmetric difference of two sets as a new set.  对称差集

(i.e. all elements that are in exactly one of the sets.)
"""
pass

def symmetric_difference_update(self, *args, **kwargs): # real signature unknown
""" Update a set with the symmetric difference of itself and another. 对称差集，并更新到a中 """
pass

def union(self, *args, **kwargs): # real signature unknown
"""
Return the union of sets as a new set.  并集

(i.e. all elements that are in either set.)
"""
pass

def update(self, *args, **kwargs): # real signature unknown
""" Update a set with the union of itself and others. 更新 """
pass

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