判断是否包含重复值

def all_unique(lst):
    print(lst,len(lst))
    # [1, 2, 3, 4, 5, 6] 6
    # [1, 2, 2, 3, 4, 5] 6
    print(set(lst),len(set(lst)))
    # {1, 2, 3, 4, 5, 6} 6
    # {1, 2, 3, 4, 5} 5
    print(len(lst) == len(set(lst)))

x = [1, 2, 3, 4, 5, 6]
y = [1, 2, 2, 3, 4, 5]
all_unique(x)
# True
all_unique(y)
# False

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2020-05-03