为了清楚起见,您需要验证元组 (1, 2) 是在 s 是吗?利用Python对可读性的灵活性可以帮助您理解为什么括号的数量是必要的。

set( # first paren is for calling the function set
    ( # second paren creates the object of items set should look at
        (1,2), # is an item in the set 
    )
    )

# output same as
set(((1,2), (1,2), (1,2)))

# output same as
t = ((1,2), (1,2), (1,2))
set(t)

# output same as
t = (1,2)
t = (t, t, t)
set(t)

# output same as
t = (1, 2)
set([t]*5)

set() 查找中的所有项 self 是的。如果您希望得到比设置变量更可读的解决方案。