Import error when old version of tqdm is installed

[grst]

When an old version of tqdm (< 4.29.1) is installed, scanpy cannot be imported.

conda create -n test_scanpy_tqdm scanpy=1.5.1 tqdm=4.19.4
conda activate test_scanpy_tqdm
python -c "import scanpy as sc" 

Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/home/sturm/anaconda3/envs/test_scanpy_tqdm/lib/python3.8/site-packages/scanpy/__init__.py", line 39, in <module>
    from . import datasets, logging, queries, external, get
  File "/home/sturm/anaconda3/envs/test_scanpy_tqdm/lib/python3.8/site-packages/scanpy/datasets/__init__.py", line 3, in <module>
    from ._datasets import (
  File "/home/sturm/anaconda3/envs/test_scanpy_tqdm/lib/python3.8/site-packages/scanpy/datasets/_datasets.py", line 8, in <module>
    from tqdm.auto import tqdm
ModuleNotFoundError: No module named 'tqdm.auto'

Suggested solution

Either

• merge Use tqdm instead of tqdm.auto when downloading datasets #1130 (which has the additional benefit that the ipywidgets extension does not have to be installed when running in jupyterlab) or
• require a minimal version of tqdm>=4.29.1.