ModuleNotFoundError: No module named '_tkinter'

[j.t]

Hi everyone,

I am trying to use matplotlib and the Tkinter backend to visualise lidar data on a 2D cartesian graph.
However I am running into the issue:

import _tkinter # If this fails your Python may not be configured for Tk
ModuleNotFoundError: No module named '_tkinter'

I have installed tkinter onto my machine I am pretty sure but am still getting this issue. Would anyone have pointers on how to fix this? Thank you.

[axel.goedrich]

Hi,

did you install tkinter into your Isaac Sim python environment?

Here is the documentration for that: Python Environment Installation — Omniverse IsaacSim latest documentation (nvidia.com)

[toni.nv]

Hi @j.t

Here you can find some steps to install and use some of the matploltib backends

• TkAgg

  Install:

  sudo apt-get install python3-tk
  

  Matplotlib configuration:

  # to get the _tkinter path run the following command in a terminal:
  #   python3.10 -c "import _tkinter; print(_tkinter.__file__)"
  # and append the parent folder to sys.path
  import sys
  sys.path.append("/usr/lib/python3.10/lib-dynload")
  
  import matplotlib
  matplotlib.use("TkAgg")
  

• GTK4Agg / GTK4Cairo

  Install:

  sudo apt-get install libcairo2-dev libgirepository1.0-dev
  ./python.sh -m pip install --upgrade pip
  ./python.sh -m pip install pycairo PyGObject
  

  Matplotlib configuration:

  import matplotlib
  matplotlib.use("GTK4Agg")  # or GTK4Cairo
  

[j.t]

Hi!

Thank you for your help. However, I am still getting this error:

ImportError: /usr/lib/python2.7/lib-dynload/_tkinter.so: undefined symbol: Py_Py3kWarningFlag

[toni.nv]

Hi @j.t

Your log shows a version for Python2.7. Make sure you are installing the version for Python 3.10 (current Kit Python version is 3.10).

[j.t]

Hi Toni,

I am running Isaac Sim on a ubuntu machine. Does the sim use its own python environment or the python installed onto the machine?

Thank you,
Jeff

[toni.nv]

Hi @j.t

All Omniverse applications, including Issac Sim, have their own Python environment (located in the kit/python folder). You can read more about it in the following link: Python Environment Installation — Omniverse IsaacSim latest documentation