my_set={1,2,3}# 创建一个非空的Setiflen(my_set)==0:print("Set is empty")else:print("Set is not empty") 1. 2. 3. 4. 5. 输出结果: Set is not empty 1. 示例3:判断Set是否为空 my_set={"apple","banana","cherry"}# 创建一个非空的Setiflen(my_set)==0:print("Set is emp...
直接使用if语句判断Set是否为空。 使用len()函数获取Set的长度,如果长度为0,则表示Set为空。 接下来,我们将通过示例代码来演示如何判定一个Set是否为空。 # 创建一个空的Setempty_set=set()# 方法一:使用if语句判断Set是否为空ifnotempty_set:print("Set is empty")# 方法二:使用len()函数获取Set的长度if...
Remove and return an arbitrary set element. Raises KeyError if the set is empty. 移除元素 """ pass defremove(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,...
Remove and return an arbitrary set element. arbitrary [ˈɑ:bɪtrəri] 任意的 Raises KeyError if the set is empty. 删除集合中任意的一个元素() 如果集合为空,报错 TypeError: pop expected at least 1 arguments, got 0 s = {1,2,3,4,5,6,"s"} s.pop()print(s) C:\python35\pytho...
Raises KeyError if the set is empty. """ pass def remove(self, *args, **kwargs): # real signature unknown """ 移除 """ """ Remove an element from a set; it must be a member. If the element is not a member, raise a KeyError. """ pass def symmetric_difference(self, *args,...
pop(...) method of builtins.set instance Remove and return an arbitrary(随机的) set element. Raises KeyError if the set is empty. In [27]: s.pop() Out[27]: 3 In [28]: s.pop() Out[28]: 4 In [29]: s.clear() In [30]: s ...
Raises KeyError if the set is empty. """ def remove(self, *args, **kwargs): # 移除指定元素,不存在会报错。 """ Remove an element from a set; it must be a member. If the element is not a member, raise a KeyError. """
my_set = set() if len(my_set) == 0: print("集合为空") else: print("集合不为空") 这样同样会输出"集合为空"。 自定义数据结构的空值校验 如果使用自定义的数据结构,可以通过定义相应的方法来进行空值校验。例如,如果有一个自定义的类表示学生信息,可以定义一个方法来检查学生信息是否为空: class...
('Set of coroutines/Futures is empty.') if return_when not in (FIRST_COMPLETED, FIRST_EXCEPTION, ALL_COMPLETED): raise ValueError(f'Invalid return_when value: {return_when}') if loop is None: loop = events.get_event_loop() fs = {ensure_future(f, loop=loop) for f in set(fs)} ...
添加到原集合中，格式为：setname.update(others)两种增加几何元素的方法，对可变集合有效，例如：>>> sample_set1 = {1, 2, 3, 4, 5}>>> sample_set1.add(6) #使用add方法添加元素到集合>>> print ("after being added, the set is: ", sample_set1)after being added, the set is: {1, 2...