Question

I am having trouble importing python packages only when running python from cmdline/console. However, when using pydev, everything seems to work fine.

I have the following filesystem…

---MarketData
   ---Parser
      ---Parser.py
      ---__init__.py
   ---IO
      ---__init__.py
      ---MarketSocket.py

Currently, Parser and IO are defined as python packages (they have init.py files, although there is no code in the Parser.init.py file.

I am trying to run the following line of code in MarketSocket.py

from Parser import Parser

Which should import the module ‘Parser’ within the package ‘Parser’ however, I get the following error.

ImportError: No Module Named Parser

Any help would be appreciated! This should work according to similar issues on stackOverflow, but for some odd reason it isn’t.

Answer 1

MarketSocket.py is in the directory IO. Therefore it is not possible to find the package Parser.

The best way to resolve this, are relative imports: from ..Parser import Parser But they might not work, if you start the script like: python MarketSocket.py. To use this, you would also have to add an __init__.py to your MarketData directory.

If it doesn’t work extend the sys.path like this:

import sys
sys.path.append('../')

With this addition, Python searches also the paths you want.

If I were you I would also think about restructuring your project. In my opinion executables should be (most of the time) at the top of your working tree, which is also like Python works.