Question

I installed easy_install under windows, and installed pygraph but the commad import gv in the example taken from here doesn’t work:

What is gv lib? what import gv does?

I get this error :

Traceback (most recent call last):
  File "C:\Python27\graph.py", line 11, in <module>
    import gv
ImportError: No module named gv

All the other imports works fine

Answer 1

This could have multiple problem sources:

1. While installing, something went wrong and the module couldn’t be installed.
2. You haven’t set your Python Path correctly.
3. @second example: The module pygraph.readwrite could exists, but it’s possible that it hasn’t got a submodule called dot.

Of course there are sure other possibile problems, but I think this would be the most likely.

Edit: Have a look at this. Looks like it’s the same problem as yours.

For the second problem eventually this discussion may also help.