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

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