cannot import name 'warnings' from 'matplotlib.dates'

[Igor-san]

I did not find the Issues section in GitHub.

Python 3.8.3
Matplotlib 3.3.0

file "github.com\backtrader-master\backtrader\plot\locator.py", line 35, in <module>
    from matplotlib.dates import (HOURS_PER_DAY, MIN_PER_HOUR, SEC_PER_MIN,
ImportError: cannot import name 'warnings' from 'matplotlib.dates' (C:\Python38\lib\site-packages\matplotlib\dates.py)

But I changed the import line and it work for me

from matplotlib import warnings

[vladisld]

I think the PR was submitted fixing this exact issue:

https://github.com/mementum/backtrader/pull/418

[phat]

@Igor-san said in cannot import name 'warnings' from 'matplotlib.dates':

section

I reinstall the matplotlib with version 3.2.0 and everything is fine.

[Yuan Xin]

Matplotlib 3.3.x is not compatible with backtrader. Matplotlib 3.2.0 is fine.
Matplotlib 3.3.x cause strange problem, plot function will exhaust memory!
my dev env:
1, Mac OS
2, python 3.7.9
3, backtrader 1.9.76.123
4, Matplotlib 3.2.0
5, pycharm
6, datafeed: pandas dataframe