复制一套

Created: November-22, 2018

套装也有 copy 方法。你可以使用此方法执行浅表复制。

 placeholderCopy>>> s1 = {()}
>>> s2 = s1.copy()
>>> s1 is s2
False
>>> s2.add(3)
>>> s1
{[]}
>>> s2
{3,[]}