我有一个 Python 文件,其中包含以下几行:
import sys
global AdminConfig
global AdminApp
该脚本在 Jython 上运行。我理解在函数内部使用 global 关键字,但是在模块级别使用“global”关键字意味着什么?
global x
更改范围规则x
在当前范围内到模块级别,所以当x
已经在模块级别了,它没有任何作用。
澄清:
>>> def f(): # uses global xyz
... global xyz
... xyz = 23
...
>>> 'xyz' in globals()
False
>>> f()
>>> 'xyz' in globals()
True
while
>>> def f2():
... baz = 1337 # not global
...
>>> 'baz' in globals()
False
>>> f2() # baz will still be not in globals()
>>> 'baz' in globals()
False
but
>>> 'foobar' in globals()
False
>>> foobar = 42 # no need for global keyword here, we're on module level
>>> 'foobar' in globals()
True
and
>>> global x # makes no sense, because x is already global IN CURRENT SCOPE
>>> x=1
>>> def f3():
... x = 5 # this is local x, global property is not inherited or something
...
>>> f3() # won't change global x
>>> x # this is global x again
1
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