得到 AttributeError: 'module' 对象在从另一个文件导入全局变量时没有属性

Question

I have two python files like this:

# first.py
global x
if __name__ == "__main__":
    x = 'test_var'

and:

# second.py
import first
class XX(object):
    @staticmethod
    def print_x():
        print first.x

I run this script:

import second
second.XX.print_x()

And I get this error:

AttributeError: 'module' object has no attribute 'x'

Any idea what's going wrong?

Answer 1

The code in first.py never runs because it isn't your entry point and the code isn't directly called, meaning x is never defined. Use first.py as your entry point or put the declaration of x into a method that you call before trying to access it.