Executing python script from command line: error with imports

Question

I have written a small script in Python with Eclipse, and it works when executed from Eclipse. But it doesn't work from command line:

>python test.py argument1 argument2
from src import Tests, ImportError: No module named src

The script is stored with the following folders:

ScriptFolder
.input
.report
.src
..test.py
..Tests
...Test1.py
...Test2.py
..TestUtils
...FileUtils.py

And this is the way I'm doing the imports at test.py:

from src import Tests
from TestUtils import FileUtils

About the init.py files, the one which shares folder with test.py is empty, and the one into Tests folder has this content:

import Test1
import Test2

And the init.py file into TestUtils has this content:

import FileUtils

The problem is that, if I change the line from src import Tests to just import Tests I'm getting error in Eclipse: Unresolved imports: Tests. found at src.Tests

How can I make it work for both Eclipse and command line?

DhruvPathak · Accepted Answer · 2013-02-25 08:24:48Z

3

sys.path.append(path_to_src_directory)

This will add a path to default paths where python looks for modules. Since, currently the path to your src directory is not known to python, it gives No module named src error. Also, your src directory does not seem to have an __init__.py file.

answered Feb 25, 2013 at 8:24

DhruvPathak

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4 Comments

Roman Rdgz Over a year ago

I don't understand why I need init.py file into root folder. Anyway, I am also importing TestConstants.py, which is into root folder, and works. I am importing FileUtils.py from TestUtils, and works. But it is not possible to import Tests. Why is that python knows where to look for those files and not the Test files? And how may I use the sys.path.append call? I guess an absolute path would not be a good praxis so, how can I use it in a relative way?

Daniel Roseman Over a year ago

"I don't understand why I need __init__.py" ... "Why is that Python knows where to look for those files and not the Test files" The second question is the answer to the first.

Roman Rdgz Over a year ago

@DanielRoseman But I understand its purpose into Tests folder, importing every py file into that folder, so then you can import all of them with just importing 'Tests'. But I don't understand its purpose into root file. In fact, if I edit root's init.py file and write import Tests, the problem remains

aychedee Over a year ago

You have a path problem, like DhruvPathak is telling you. You would be wise to read the documentation on modules: docs.python.org/2/tutorial/modules.html "The __init__.py files are required to make Python treat the directories as containing packages; this is done to prevent directories with a common name, such as string, from unintentionally hiding valid modules that occur later on the module search path. In the simplest case, __init__.py can just be an empty file, but it can also execute initialization code for the package or set the __all__ variable, described later."

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