Fix ImportError: No Module Named in Python

pythonpython-import

I am very new to python, about one month, and am trying to figure out how the importing works in python. I was told that I can import any 'module' that has Python code in it. So I am trying to import a module just to try it out, but I keep getting an 'ImportError: No module named redue'. This is an example of the python shell:

>>> import os
>>> os.chdir('C:\Users\Cube\Documents\Python')
>>> for file in os.listdir(os.getcwd()):
     print file
pronounce.py
pronounce.pyc
readwrite.py
rectangle.py
reduc.py

>>> import reduc

Traceback (most recent call last):
   File "<pyshell#32>", line 1, in <module>
    import reduc
ImportError: No module named reduc

What am I doing wrong? I am I overlooking something, or was I just wrongly informed?

Best Answer

These files are not on sys.path. It should have been though.

If you want to access them from the interpreter, you will need to add the location to sys.path

>>> import sys
>>> print sys.path
>>> sys.path.append('C:\\Users\\Cube\\Documents\\Python')
>>> import reduc

You could also include the path in environment variable - PYTHONPATH

See the details on module search path here :

Also look at (PYTHONPATH) environment variable details here:

http://docs.python.org/using/cmdline.html#environment-variables

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Python ImportError – No Module Named

Based on your comments to orip's post, I guess this is what happened:

You edited __init__.py on windows.
The windows editor added something non-printing, perhaps a carriage-return (end-of-line in Windows is CR/LF; in unix it is LF only), or perhaps a CTRL-Z (windows end-of-file).
You used WinSCP to copy the file to your unix box.
WinSCP thought: "This has something that's not basic text; I'll put a .bin extension to indicate binary data."
The missing __init__.py (now called __init__.py.bin) means python doesn't understand toolkit as a package.
You create __init__.py in the appropriate directory and everything works... ?

Python ImportError – No Module Named Solution

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.

Best Answer

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Python ImportError – No Module Named

Python ImportError – No Module Named Solution

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