Hello,

I have been using scanpy to analyze some single cell data using google colab. 

Everything was working ok but all of a sudden I rerun the notebook and now when I try to import scanpy I get the error below. What could be causing this?

```
---------------------------------------------------------------------------
TypeError                                 
Traceback (most recent call last)
<ipython-input-12-04a6a9427c98> in <module>
      2 import numpy as np
      3 import pandas as pd
----> 4 import scanpy as sc
      5 import matplotlib.pyplot as plt
      6 get_ipython().run_line_magic('matplotlib', 'inline')

3 frames
/usr/local/lib/python3.8/dist-packages/scanpy/plotting/_utils.py in
<module>
     33 
     34 
---> 35 class _AxesSubplot(Axes, axes.SubplotBase, ABC):
     36     """Intersection between Axes and SubplotBase: Has methods of both"""
     37 

TypeError: metaclass conflict: the metaclass of a derived class must be a (non-strict) subclass of the metaclasses of all its bases
```

Thank you
Hey y'all a fellow from scverse replied to my question and resolved our issue. 

The issue seems to be that matplotlib version 3.7 is incompatible with scanpy version 1.9.1 

As such, to resolve this issue you need to do is install a version of matplotlib thats older than 3.7. I used version 3.6 and that completely eradicated the metaclass issue.  

    pip install 'matplotlib == 3.6'

For further reference see the Github page: 

https://github.com/scverse/scanpy/issues/2411 