python骚操作之...

python中的Ellipsis对象。写作:…

中文解释:省略

该对象bool测试是为真

用途：

1.用来省略代码，作用类似于pass的一种替代方案.

from collections.abc import Iterable
def changelist(key):
    if isinstance(key, Iterable) and len(key) == 3 and key[1] is Ellipsis:
        return range(key[0], key[-1] + 1)

def will_do_something():
    ...

SelectorEventLoop = ...
l=[1,...,80]
make = changelist(l)
print(list(make))

输出

[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80]