Question

I have a folder with a __init__.py

File __init__.py:

#!/usr/bin/python2
flags="test"

File main.py:

#!/usr/bin/python2
import foldername

def main():
    print foldername.flags

if __name__ == '__main__':
main()

Now, when I run ./main.py (from inside the folder), I get the error

ImportError: No module named foldername

Answer 1

Run from the parent folder for foldername:

    $ python -m foldername.main

If you rename main.py to __main__.py then you could run it as (since Python 2.7):

    $ python -m foldername

python -m adds implicitly current directory to your python path (sys.path).

Parent Folder/
└── foldername
    ├── __init__.py
    │   #    flags="test"
    └── __main__.py
        #    import foldername
        #   
        #    def main():
        #        print foldername.flags
        #   
        #    if __name__=="__main__":
        #        main()

If the parent directory for foldername is in your python path then you could run the above commands from any directory.