how can I import python module tkinter in gitpod

Question

I can't import pyton module tkinter in my gitpod workspace.

My .gitpod.Dockerfile contains:

FROM gitpod/workspace-full-vnc
USER root
RUN apt update && apt install -y python-tk python3-tk tk-dev

but when I run my project I get

Traceback (most recent call last):
  File "basic-screen-changer.py", line 1, in <module>
    import tkinter as tk
  File "/home/gitpod/.pyenv/versions/3.8.6/lib/python3.8/tkinter/__init__.py", line 36, in <module>
    import _tkinter # If this fails your Python may not be configured for Tk
ModuleNotFoundError: No module named '_tkinter'

python --version shows me Python 3.8.6.
Installed packaged are:

itpod /workspace/pydiag $ dpkg -l |grep ^ii |tr -s ' ' |cut -d ' ' -f2,3 |egrep '^python.*tk|^tk'
python-tk 2.7.18-1
python3-tk:amd64 3.8.5-1~20.04.1
tk 8.6.9+1
tk-dev:amd64 8.6.9+1
tk8.6 8.6.10-1
tk8.6-blt2.5 2.5.3+dfsg-4
tk8.6-dev:amd64 8.6.10-1

Answer 1

That problem occurs because the workspace-full-vnc image uses pyenv and the module path is different (source). To use python modules, you need to install them using python2 or python3 -m pip install ....