$ ls -l
-rw-rw-r--  1 dotancohen dotancohen   97 Nov  1 16:52 foo.py

$ ls -l pypackage/
-rwxrwxr-x 1 dotancohen dotancohen 104 Nov  1 16:50 abc.py
-rwxrwxr-x 1 dotancohen dotancohen   0 Nov  1 16:50 __init__.py

$ cat pypackage/__init__.py
$ cat pypackage/abc.py
#!/usr/bin/python

def main():
        print("ABC Main!")
        return True

if __name__ == '__main__':
        main()

$ cat foo.py
#!/usr/bin/python

import sys
sys.path.insert(0, './pypackage')

from abc import main
main()

$ python foo.py
Traceback (most recent call last):
  File "foo.py", line 7, in <module>
    from abc import main
ImportError: cannot import name main