ImportError No module named - Python

Question

I have a python application with the following directory structure   src      ---- main      ---- util      ---- gen py                      ---- lib   In the package main  I have a python module named MyServer py which has an import statement like    from gen py lib import MyService   In order for this statement to work  I placed the following line at the beginning of MyServer py   import sys sys path append     gen py lib     When I run MyServer py in the terminal  I get the following error      ImportError  No module named gen py lib   What I am missing here

User · Answer

For the Python module import to work  you must have  src  in your path  not  gen py lib    When processing an import like import gen py lib  it looks for a module gen py  then looks for a submodule lib   As the module gen py won t be in     gen py lib   it ll be in        the path you added will do nothing to help the import process   Depending on where you re running it from  try adding the relative path to the  src  folder  Perhaps it s sys path append        You might also have success running the script while inside the src folder directly  via relative paths like python main MyServer py

User · Answer

Your modification of sys path assumes the current working directory is always in main   This is not the case  Instead  just add the parent directory to sys path   import sys import os path  sys path append os path join os path dirname   file            import gen py lib   Don t forget to include a file   init   py in gen py and lib - otherwise  they won t be recognized as Python modules

User · Answer

make sure to include   init   py  which makes Python know that those directories containpackages

User · Answer

This is if you are building a package and you are finding error in imports  I learnt it the hard way The answer isn t to add the package to python path or to do it programatically  what if your module gets installed and your command adds it again   thats a bad way    The right thing to do is  1  Use virtualenv pyvenv-3 4 or something similar 2  Activate the development mode -  python setup py develop

User · Answer

from   gen py lib import MyService   or  from main gen py lib import MyService   Make sure you have a  at least empty    init   py file on each directory

User · Answer

Make sure if root project directory is coming up in sys path output  If not  please add path of root project directory to sys path

[python] ImportError: No module named - Python

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