What is import gv in python?

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

Try to install libgv-python with your package manager. On Ubuntu:

sudo apt-get install libgv-python

Answer 2

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.

Answer 3

This seems to be a common issue with python-graph, see the discussion at http://code.google.com/p/python-graph/issues/detail?id=15. gv is GraphViz and apparently something with the place or the bindings of this library is wrong. You might have to modify sys.path, but it might be even more troublesome on Windows.