python determining name of the importing module

Question

How do you determine the name of the importing module within the module that is being imported. I have the partial solution, but not the complete one.

The code is: A.py

import B

if __name__ == '__main__':
    print 'This a test'

The B.py

import sys
import C
if sys.argv[0] == 'A':
    doSomething()

At this point, I'm all set because within module B, I know that name of the main that invoked the importing which in this case is A. However, within B, an import of C is requested, and it is in C that I want to know whether B imported C? How is this done?

Answer 1

sys.argv[0] is not a name of module when import was performed. This is name of executable file.

On the other side, inside Python module __name__ equals to a) module name if it's executed by importing, b) "__main__" if it was executed as script.

Module doesn't "know" who performed import (no "parent" attribute or something like this). Define your behavior with different functions and call them from different modules.