set 集合、ユニークなキーを保管する

 set 集合、ユニークなキーを保管する

keys = set()

keys.add("test1")

keys.add("test2")

keys.add("test2")

keys.add("test1")

print(keys)

if "test1" in keys:

    print("test1 is in keys")

print("num of keys = " + str(len(keys)))

↓結果

{'test1', 'test2'}

test1 is in keys

num of keys = 2

keys= set([1,2,4,6])

keys.add(1)

print(keys)

print("num of keys = " + str(len(keys)))

↓結果

{1, 2, 4, 6}

num of keys = 4