Install error: ImportError: No module named ldtp

[richelbilderbeek]

As can be seen from a Travis CI build log, importing ldtp fails:

python minimal.py

gives:

Traceback (most recent call last):
  File "minimal.py", line 3, in <module>
    from ldtp import *
ImportError: No module named ldtp

First line in minimal.py is from ldtp import * (it is a script suggested by @nagappan at #35).

This is the compete reproduction of it (from the .travis.yml script):

# Install prerequisites
sudo apt-get install python-twisted-web
sudo apt-get install python-wnck
# Build LDTP
python setup.py build
sudo python setup.py install
# Build and run examples
cd examples
python minimal.py

It guess someone with some Python knowledge can easily see what went wrong.

[nagappan]

This means ldtp is not installed in path, check /usr/local/lib/python folder (I think)

[richelbilderbeek]

Does this mean that setup.py does not install LDTP correctly? As these are the lines that should install LDTP:

# Build LDTP
python setup.py build
sudo python setup.py install

[stuaxo]

Are you sure that when it runs "python", are you sure it is the same instance of python that ldtp is installed to ?

Try using the full path to the python interpreter, since the first one in the path may not be the same one.

[stuaxo]

You can output see python is being called by adding this somewhere in your travis script

echo `which python`

You could also try adding this to minimal.py:

import sys
print(sys.executable)

[richelbilderbeek]

Thanks for your help!

I've added your suggestions and obtained a new build log.

Note that the two different ways to find out which is the Python executable give different results:

Way	Result
which python	/opt/pyenv/shims/python
print(sys.executable)	/usr/bin/python

Still, the error is now:

$ python minimal.py
/usr/bin/python
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/local/lib/python2.7/dist-packages/ldtpd/__init__.py", line 38, in <module>
    from xmlrpc_daemon import XMLRPCLdtpd
  File "/usr/local/lib/python2.7/dist-packages/ldtpd/xmlrpc_daemon.py", line 25, in <module>
    import core
  File "/usr/local/lib/python2.7/dist-packages/ldtpd/core.py", line 24, in <module>
    from pyatspi import findDescendant, Registry
ImportError: No module named pyatspi

I hope one day your team will get the minimal example working on Travis, as it would be helpful to users (like me) trying out a package 👍

If you have more suggestions, I'll be happy to help!

[stuaxo]

It looks like you may have yet another python installed in /usr/local.

I would specify the full path to python and pip when you use them to avoid ambiguity.

Without doing this you might get different copies especially when using sudo.

[richelbilderbeek]

I've used usr/local/python instead of just python. From the build log, I now get:

/usr/bin/python
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/local/lib/python2.7/dist-packages/ldtpd/__init__.py", line 38, in <module>
    from xmlrpc_daemon import XMLRPCLdtpd
  File "/usr/local/lib/python2.7/dist-packages/ldtpd/xmlrpc_daemon.py", line 25, in <module>
    import core
  File "/usr/local/lib/python2.7/dist-packages/ldtpd/core.py", line 24, in <module>
    from pyatspi import findDescendant, Registry
ImportError: No module named pyatspi

I assume that stops even getting to importing ldtp...

[stuaxo]

OK, so you're going to need to make pyatspi is installed and accessible from the python in /usr/local

[richelbilderbeek]

Yes, I understand.

I give up. If I cannot get such a simple example running working on Travis, I will abandon ldtp until someone does succeed. I hope this Issue log helps him/her to do so.

Closing the Issue...

[stuaxo]

Yeah - I found it very hard to get it working, it seems like the it's a very old library and built as such.
I also gave up as I was only playing with it on a whim.

Like other libraries that came out before virtualenv existed it doesn't work well with it (or at all without a lot of effort), the code style looks very like C translated into python.

The best thing that could happen is to make a new library with the same license, and pythonic code style, using ldtp for reference to build it.

[richelbilderbeek]

Well, I found it easy to get ldtp to work locally (kudos to the ldtp maintainers). I just fail to get it to run on Travis. Due to that, I cannot use it in my continuous integration test suites.

@stuaxo: thanks for the help 👍

[stuaxo]

The things I mentioned are mostly down do the age of the package, its good it's still available and there aren't many things that can do a similar job.