import matplotlib.pyplot にエラーが返される:
(venv) $ python
>>> import matplotlib.pyplot as plt
Unable to init server: Could not connect: Connection refused
Unable to init server: Could not connect: Connection refused
(.:7348): Gdk-CRITICAL **: 16:12:36.744:
gdk_cursor_new_for_display: assertion 'GDK_IS_DISPLAY (display)' failed
(.:7348): Gdk-CRITICAL **: 16:12:36.750:
gdk_cursor_new_for_display: assertion 'GDK_IS_DISPLAY (display)' failed
>>>
matplotlib のチェックを兼ねて,upgrade をコマンドを試す:
(venv) $ pip install -U matplotlib
‥‥
Attempting uninstall: matplotlib
Found existing installation: matplotlib 3.0.2
Not uninstalling matplotlib at /usr/lib/python3/dist-packages,
outside environment /home/pi/venv
Can't uninstall 'matplotlib'. No files were found to uninstall.
Successfully installed matplotlib-3.4.1 pillow-8.2.0 pyparsing-2.4.7
改めて,import matplotlib.pyplot をする:
(venv) $ python
>>> import matplotlib.pyplot as plt
Matplotlib is building the font cache; this may take a moment.
>>>
"Matplotlib is building the font cache; this may take a moment." のメッセージが現れるのは初回だけで,次回からは無くなる:
(venv) $ python
>>> import matplotlib.pyplot as plt
>>>
|