Matplotlib lower bound causes issues in google colab

[adamgayoso]

scanpy/pyproject.toml

Line 57 in d26be44

"matplotlib>=3.4",

Colab has 3.2.2 installed and installing scanpy requires restarting the runtime. I also can't find a great reason why 3.4 was chosen

#2212

based on this 3.2.2 should be fine?

[flying-sheep]

#2733 bumps the minimum version up to 3.6 and adds two good reasons why that exact minimum version requirement is chosen:

1. matplotlib’s maintenance schedule drops support for 3.5 in a little bit
2. we use a feature from 3.5

If some piece of infrastructure doesn’t allow bumping versions of client libraries, that piece of infrastructure needs improvement. Jupyter allows distinct environments for kernels and the server for a reason. So while colab should be able to pin and use whatever they need on the server, there’s zero reason why colab should dictate any version of anything other than ipykernel for the user environment.

[ivirshup]

Default matplotlib in colab seems to be 3.7 now also