导入错误：无法从 Kivy Matplotlib 后端的

Question

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)

Answer 1

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的 (3.0.0)，它将无法工作。尝试使用 matplotlib==2.1.2（我目前在这个版本上，可以确认 weight_as_number 仍然存在）