python - 导入错误: cannot import name 'weight_as_number' from 'matplotlib.font_manager' ERROR on Kivy Matplotlib backend

Question

当我导入 Garden.matplotlib 包时，我收到一条错误消息:ImportError:无法从“matplotlib.font_manager”导入名称“weight_as_number”

我在命令提示符中使用Python来逐步导入。我在 Garden.matplotlib 导入行中发现一个错误。

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)

Answer 1

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

尝试使用matplotlib==2.1.2(我目前使用的是这个版本，并且可以确认weight_as_number仍然存在)