Python集合的常用方法

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=",")

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