YouCompleteMe/Python can complete for built-in libs, but not site-packages

Question

I just installed ycm, everything looks good, but I found small problem. The problem is as following:

import os    # os is built-in library
os.          # ycm helps to complete members of the class.
import numpy # numpy is not built-in library, where its location is site-packages. 
numpy.       # nothing happened. ycm shows 'pattern not found' message.

I think, this would be a simple problem. But I could not find the solution yet. I think, there is some configuration file in which I can define 'search path' for my project.

It would be grateful if I can find a way to solve it.

Best,

Je-Hoon Song

Answer 1

I had the same issue with module 'mpmath' and fixed it in the following manner: First I retrieved the path where the module was located:

%python3
>>>import mpmath
>>>print(mpmath.__file__)
/usr/lib/python3.4/site-packages/mpmath/__init__.py

Here I found the path of all my "installed" python3 packages to be:

/usr/lib/python3.4/site-packages/

I then simply added to my PYTHONPATH environment variable this path:

%export PYTHONPATH=/usr/lib/python3.4/site-packages/

Then when I used vim sample.py typing import mpmath and following it up with mpmath. YCM showed me all the autocompletions for the mpmath module.

Hope this helps.

Answer 2

I use anaconda python to be my python interpreter in ycm to solve this. First I modified my vimrc according to full pythong setting in vim. Then I change g:ycm_python_interpreter_path by

let g:ycm_python_interpreter_path = '/usr/local/anaconda3/bin/python3.8'

In this way I didn't change the system environment variables.

Addtional Info 1: I think the main problem is that, my Python interpreter for YCM is my system python (/usr/local/opt/[email protected]/bin/python3.9 ), which only has limited locally built libraries. So using the libraries comes with anaconda (/usr/local/anaconda3/bin/python3.8 ) can solve.

Additional Info 2: By reading :YcmDebugInfo, the main different after edited g:ycm_python_interpreter_path is that:

-- Python completer debug information:
--   Python interpreter: /usr/local/opt/[email protected]/bin/python3.9
--   Python path: ['/usr/local/Cellar/[email protected]/3.9.6/Frameworks/Python.framework/Versions/3.9/lib/python39.zip', '/usr/local/Cellar/[email protected]/3.9.6/Frameworks/Python.framework/Versions/3.9/lib/python3.9', '/usr/local/Cellar/[email protected]/3.9.6/Frameworks/Python.framework/Versions/3.9/lib/python3.9/lib-dynload', '/usr/local/lib/python3.9/site-packages']
--   Python version: 3.9.6

change to

-- Python completer debug information:
--   Python interpreter: /usr/local/anaconda3/bin/python3.8
--   Python path: ['/usr/local/anaconda3/lib/python38.zip', '/usr/local/anaconda3/lib/python3.8', '/usr/local/anaconda3/lib/python3.8/lib-dynload', '/usr/local/anaconda3/lib/python3.8/site-packages', '/usr/local/anaconda3/lib/python3.8/site-packages/aeosa', '/usr/local/anaconda3/lib/python3.8/site-packages/locket-0.2.1-py3.8.egg']
--   Python version: 3.8.8

Additional Info 3: about how to read list of locally installed pyton modules use https://stackoverflow.com/a/740018/11226687 e.g. in my case

$ /usr/local/opt/[email protected]/bin/python3.9
>>> help('modules')
# only return limitted modules
$ /usr/local/anaconda3/bin/python3
>>> help('modules')
# list out all the modules included in Anaconda, including numpy/matplotlib/scipy ect