Python集合的常用方法
注释很详细
collection={1,2,"apple","orange","cat"} # 查看一个数是否在集合中 in print("Tom 是否在集合中:","Tome" in collection) print("apple 是否在集合中:","apple" in collection) # 集合初始化时用set() pets={}是代表初始化了一个字典集 pets=set() # 集合添加元素用add()方法,删除元素用discard() pets.add("dog") pets.add("cat") pets.add("bird") pets.add("zebra") print(pets) pets.discard("zebra") print(pets) # 集合的 与 或 非 print("并集:",pets | collection ) print("交集:",pets & collection) print("异或:",pets - collection) # 将一个字典集的keys转为集合,用set(字典集名) dict1={"cat":1,"dog":2,"bird":3} print(set(dict1)) # 向一个集合中添加另一个集合用update()方法 collection.update([12,13,14]) print(collection)
for i in set("apple"): print(i,end=",") print() for j in "apple": print(j,end=",")
输出结果”
E:\Program_Files\PythonAll\workspace\MyLearnProject\venv\Scripts\python.exe E:/Program_Files/PythonAll/workspace/MyLearnProject/pythonCode/collection/collectionFunc.py Tom 是否在集合中: False apple 是否在集合中: True {'dog', 'cat', 'bird', 'zebra'} {'dog', 'cat', 'bird'} 并集: {1, 2, 'bird', 'apple', 'orange', 'dog', 'cat'} 交集: {'cat'} 异或: {'dog', 'bird'} {'dog', 'cat', 'bird'} {1, 2, 12, 13, 14, 'apple', 'cat', 'orange'} l,p,e,a, a,p,p,l,e, Process finished with exit code 0