3.14 only error with tkinter - "Can't find a usable init.tcl", "This probably means that Tcl wasn't installed properly." #913
Description
Summary
The following is throwing an error for me (Ubuntu 24.04.2 on WSL2) on Python 3.14.0 & Python 3.14.1
uv run --isolated -p 3.14.1 python -c 'import tkinter as tk; tk.Tk()'output:
Traceback (most recent call last):
File "<string>", line 1, in <module>
import tkinter as tk; tk.Tk()
~~~~~^^
File "/home/jack/.local/share/uv/python/cpython-3.14.1-linux-x86_64-gnu/lib/python3.14/tkinter/__init__.py", line 2479, in __init__
self.tk = _tkinter.create(screenName, baseName, className, interactive, wantobjects, useTk, sync, use)
~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
_tkinter.TclError: Can't find a usable init.tcl in the following directories:
/tools/deps/lib/tcl8.6 /home/jack/.cache/uv/builds-v0/.tmpdenXkW/lib/tcl8.6 /home/jack/.cache/uv/builds-v0/lib/tcl8.6 /home/jack/.cache/uv/builds-v0/.tmpdenXkW/library /home/jack/.cache/uv/builds-v0/library /home/jack/.cache/uv/builds-v0/tcl8.6.14/library /home/jack/.cache/uv/tcl8.6.14/library
This probably means that Tcl wasn't installed properly.
By contrast, other Python versions work without issue
uv run --isolated -p 3.13.10 python -c 'import tkinter as tk; tk.Tk()'I don't know anything about Tcl or tkinter but originally encountered this when trying to do something simple in matplotlib - eg.
uv run --isolated -p 3.14 -w matplotlib python -c 'import matplotlib.pyplot as plt; plt.subplots()' Platform
Linux 6.6.87.2-microsoft-standard-WSL2 x86_64 GNU/Linux (Ubuntu 24.04.2 on WSL)
Version
uv 0.9.15
Python version
Python 3.14.1 (cpython-3.14.1-linux-x86_64-gnu)