python - 错误 : from matplotlib import _png ImportError: cannot import name '_png' from 'matplotlib' (C:\\Garden\lib\site-packages\matplotlib\__init__. py)

Question

我想使用 garden.matplotlib.FigureCanvas，但我每次都会遇到同样的问题。我安装了 matplotlib、garden 和 kivy(单独)。所有库安装工作，除了 matplotlib.backend_kivyagg。
我从 kivy 下载了一个文件用于测试 ( https://github.com/kivy-garden/garden.matplotlib )。这里的错误:

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Traceback (most recent call last):
   File "C:/Users/alidi/OneDrive/Desktop/Garden/garden.matplotlib/garden.matplotlib-master/examples/test_backend.py", line 10, in <module>
     from kivy.garden.matplotlib.backend_kivyagg import FigureCanvas,\
   File "C:\Users\alidi\Desktop\Data_analysis_book_\Garden\lib\site-packages\kivy\garden\__init__.py", line 180, in load_module
     return self._load_module(fullname, moddir)
   File "C:\Users\alidi\Desktop\Data_analysis_book_\Garden\lib\site-packages\kivy\garden\__init__.py", line 183, in _load_module
     mod = imp.load_module(fullname, None, moddir,
   File "C:\Users\alidi\AppData\Local\Programs\Python\Python38-32\lib\imp.py", line 244, in load_module
     return load_package(name, filename)
   File "C:\Users\alidi\AppData\Local\Programs\Python\Python38-32\lib\imp.py", line 216, in load_package
     return _load(spec)
   File "C:\Users\alidi\.kivy\garden\garden.matplotlib\__init__.py", line 1, in <module>
     from kivy.garden.matplotlib.backend_kivy import FigureCanvasKivy,\
   File "C:\Users\alidi\.kivy\garden\garden.matplotlib\backend_kivy.py", line 256, in <module>
     from matplotlib import _png
 ImportError: cannot import name '_png' from 'matplotlib' (C:\Users\alidi\Desktop\Data_analysis_book_\Garden\lib\site-packages\matplotlib\__init__.py)

Process finished with exit code 1

Answer 1

在python 3.7, kivy==2.0.0, kivy-garden==0.1.4, matplotlib==3.4.1 有同样的问题。降级 matplotlib 解决了问题:

pip install matplotlib==3.1.1