如注释中所述，Python中的 global 表示模块级别.

As stated in the comments, global in Python means module level.

这样做:

a = 1

对 a 的作用与以下完全相同:

Has the exact same effect on a as:

def f():
    global a
    a = 1
f()

在这两种情况下，变量都不在模块之间共享.

And in both cases the variable is not shared across modules.

如果要在模块之间共享变量，请检查此.

If you want to share a variable across modules, check this.