将变量从一个python脚本导入到另一个python脚本时出错

Question

I have a set of more than 10 variables defined in __main__ of one python script and they are needed to import into another python script to use their values inside different methods. I used from <pythonfile> import var1, var2 ...., var10 in the calling python script but it is giving me error like below:-

ImportError: cannot import name 'envName'

Sample structure of my A.py and B.py scripts are like this:- A.py

if __name__ == '__main__':
    var1 = "text1"
    var2 = "text2"
    var3 = "text3"
    B.methodA()

B.py

from A import var1, var2, var3

def methodA()
    print(var1)

This is something I am looking for. Basically I have like more than 10 variables to use in another script (both scripts are in same folder) so need some help to find out the best way to do it. I know the process above I am using could be very stupid and wrong.

Can anyone please help me? I am using python3.6 Also what is the best way to import and use these many variables from one python script into another python script?

Answer 1

Assuming you mean that by defining the variables "in __main__ " you mean you have something like:

if __name__ == '__main__':
    var1 = 'foo'

then you can't directly import var1 into another script. __name__ is only '__main__' if the file is being run directly. If you're importing it into another script __name__ is not '__main__' so the variables are never defined. Simply taking var1 = 'foo' out of if __name__ == '__main__' should solve your problem.