译自What Are Python 'Sets' and How Do You Use Them?，作者 Jack Wallen。Python 集合（Set）是一种可迭代、可变且不可重复的数据类型。此数据类型非常方便。例如，你需要存储员工 ID 的信息。你肯定不希望这些 ID 在应用程序中重复，因为这可能会导致问题。例如，你有以下员工 ID：001002003004…你可以将特定...
python内置函数系列之set(一)(持续更新) 查看python中set介绍(ctrl + 鼠标左键): 有如下介绍: """ set() -> new empty set object set(iterable) -> new set object Build an unordered collection of unique elements. """ 1. 2. 3. 4. 5. 6. 由此可知: set函数返回值: 一个set object (集合...
s2中没有的元素,并保存到一个新的集合defdifference(self, *args, **kwargs):#real signature unknown"""Return the difference of two or more sets as a new set.
| Return the symmetric difference of two sets as a new set. | | (i.e. all elements that are in exactly one of the sets.) | | symmetric_difference_update(...) | Update a set with the symmetric difference of itself and another. | | union(...) | Return the union of sets as a...
""" pass def intersection(self, *args, **kwargs): # real signature unknown """ 取交集,新创建一个set """ """ Return the intersection of two or more sets as a new set. (i.e. elements that are common to all of the sets.) """ pass def intersection_update(self, *args, **kwar...
Python has a set of built-in methods that you can use on sets.MethodShortcutDescription add() Adds an element to the set clear() Removes all the elements from the set copy() Returns a copy of the set difference() - Returns a set containing the difference between two or more sets ...
python 集合 set python的set和其他语言类似, 是一个无序不重复元素集, 基本功能包括关系测试和消除重复元素. sets 支持 x in set, len(set),和 for x in set。作为一个无序的集合,sets不记录元素位置或者插入点。因此,sets不支持 indexing, slicing, 或其它类序列(sequence-like)的操作。
Return the union of sets as a new set.(all elements that are in either set.) 2 语法:S.union(set1,set2...) 3 实例展示: 4 >>> S1 = set('spiritman') 5 >>> print S1 6 set(['a', 'i', 'm', 'n', 'p', 's', 'r', 't']) 7...
map(function_to_apply, list_of_inputs) 大多数时候,我们要把列表中所有元素一个个地传递给一个函数,并收集输出。比方说: items = [1, 2, 3, 4, 5] squared = [] for i in items: squared.append(i**2) Map可以让我们用一种简单而漂亮得多的方式来实现。就是这样: ...
x =set(('apple','banana','cherry')) Try it Yourself » Definition and Usage Theset()function creates a set object. The items in a set list are unordered, so it will appear in random order. Read more about sets in the chapterPython Sets. ...