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

wildajet

MacOS big Sur
python 3.9.2
matplotlib 3.3.4
backtrader 1.9.76.123

Change /usr/local/lib/python3.9/site-packages/backtrader/plot/locator.py

from:
from matplotlib.dates import (HOURS_PER_DAY, MIN_PER_HOUR, SEC_PER_MIN,
MONTHS_PER_YEAR, DAYS_PER_WEEK,
SEC_PER_HOUR, SEC_PER_DAY,
num2date, rrulewrapper, YearLocator,
MicrosecondLocator, warnings)

to:
from matplotlib import warnings
from matplotlib.dates import (HOURS_PER_DAY, MIN_PER_HOUR, SEC_PER_MIN,
MONTHS_PER_YEAR, DAYS_PER_WEEK,
SEC_PER_HOUR, SEC_PER_DAY,
num2date, rrulewrapper, YearLocator,
MicrosecondLocator)