[Python] Error while using matplotlib: "AttributeError: module 'gi' has no attribute...

I'm on Fedora 41, with a virtualenv with Python 3.12.7 (matplotlib==3.9.2). The following code:

import matplotlib.pyplot as plt
plt.figure(figsize=(10, 7))


or just

import gi
gi.require_version("Gtk", "4.0")


produce the error "AttributeError: module 'gi' has no attribute 'require_version'". When I try to install PyGObject with pip, I get the following error:

$ pip install PyGObject
...
Getting requirements to build wheel ... done
Preparing metadata (pyproject.toml) ... error
error: subprocess-exited-with-error

× Preparing metadata (pyproject.toml) did not run successfully.
│ exit code: 1
╰─> [48 lines of output]

...
Compiler for C supports arguments -fvisibility=hidden: YES
Found pkg-config: YES (/usr/bin/pkg-config) 2.3.0
Run-time dependency cairo found: YES 1.18.0
Run-time dependency python found: NO (tried pkgconfig, pkgconfig and sysconfig)

../cairo/meson.build:51:15: ERROR: Python dependency not found


same error with pip install cairo

I tried MANY solutions given by some similar posts:

$ pkg-config --modversion gtk4
4.16.5


$ pip uninstall gi
WARNING: Skipping gi as it is not installed.


$ pip install PyGTK
Preparing metadata (setup.py) ... error
error: subprocess-exited-with-error

× python setup.py egg_info did not run successfully.
│ exit code: 1
╰─> [4 lines of output]
********************************************************************
* Building PyGTK using distutils is only supported on windows. *
* To build PyGTK in a supported way, read the INSTALL file. *
********************************************************************
[end of output]


$ sudo dnf install python3-gi
Updating and loading repositories:
Repositories loaded.
Failed to resolve the transaction:
No match for argument: python3-gi


$ sudo dnf install python3-gobject
Updating and loading repositories:
Repositories loaded.
The package 'python3-gobject-3.48.2-3.fc41.x86_64' is already installed.


same for python3-gobject-base and gobject-introspection.

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