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首页 > 解决方案 > ImportError: cannot import name 'weight_as_number' from 'matplotlib.font_manager' 错误在 Kivy Matplotlib 后端

python - ImportError: cannot import name 'weight_as_number' from 'matplotlib.font_manager' 错误在 Kivy Matplotlib 后端

问题描述

当我导入 garden.matplotlib 包时，我收到一条错误消息： ImportError: cannot import name 'weight_as_number' from 'matplotlib.font_manager'

我在命令提示符中使用 Python 逐步导入。我在 garden.matplotlib 导入行中发现错误。

系统：Windows 10、Python 3.7.0、Kivy 1.10.1

>>> import matplotlib
Backend TkAgg is interactive backend. Turning interactive mode on.

>>> matplotlib.use('module://kivy.garden.matplotlib.backend_kivy')

>>>from kivy.garden.matplotlib.backend_kivyagg import FigureCanvasKivyAgg

[INFO ] [Logger ] Record log in C:\Users\user.kivy\logs\kivy_18-10-03_7.txt
[INFO ] [Kivy ] v1.10.1
[INFO ] [Python ] v3.7.0 (v3.7.0:1bf9cc5093, Jun 27 2018, 04:06:47) [MSC v.1914 32 bit (Intel)]
Traceback (most recent call last):
File "", line 1, in
File "C:\Program Files\JetBrains\PyCharm Community Edition 2018.2\helpers\pydev_pydev_bundle\pydev_import_hook.py", line 20, in do_import
module = self.system_import(name, *args, **kwargs)
File "D:\Documents\venv\lib\site-packages\kivy\garden_init.py", line 100, in load_module
return self.load_module(fullname, moddir)
File "D:\Documents\venv\lib\site-packages\kivy\garden_init.py", line 104, in _load_module
('', '', imp.PKG_DIRECTORY))
File "C:\Python37-32\lib\imp.py", line 245, in load_module
return load_package(name, filename)
File "C:\Python37-32\lib\imp.py", line 217, in load_package
return load(spec)
File "C:\Users\user.kivy\garden\garden.matplotlib_init.py", line 1, in
from kivy.garden.matplotlib.backend_kivy import FigureCanvasKivy,
File "C:\Program Files\JetBrains\PyCharm Community Edition 2018.2\helpers\pydev_pydev_bundle\pydev_import_hook.py", line 20, in do_import
module = self._system_import(name, *args, **kwargs)
File "C:\Users\user.kivy\garden\garden.matplotlib\backend_kivy.py", line 257, in
from matplotlib.font_manager import weight_as_number
ImportError: cannot import name 'weight_as_number' from 'matplotlib.font_manager' (D:\Documents\venv\lib\site-packages\matplotlib\font_manager.py)

标签： pythonmatplotlibkivy

解决方案

Kivy 仅支持旧版本的 matplotlib。他们在 matplotlib==2.1.x 之后的某处删除了 weight_as_number 函数，因此如果您运行的是最新版本（3.0.0），它将无法正常工作。

尝试使用 matplotlib==2.1.2 （我目前在这个版本，可以确认 weight_as_number 仍然存在）

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