I keep getting an error when trying to plot with matplotlib

Question

I am using a plotting function that utilizes matplotlib and all of a sudden, it has stopped working and is returning the following error.

from matplotlib.dates import (HOURS_PER_DAY, MIN_PER_HOUR, SEC_PER_MIN,
ImportError: cannot import name 'warnings' from 'matplotlib.dates'

Is there a known fix for this?

Thanks

You are going to have a difficult time finding help if you tell us the error happened "all of a sudden" instead of showing the code. — M-Wi
– M-Wi, Commented Jul 20, 2020 at 16:08

FFF · Accepted Answer · 2020-07-20 21:24:41Z

5

Let me guess ... You are using backtrader and had this issue while using it. The error you have is :

File "/xxx/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'

The root cause of the error is that at line 35 of above mentionned file (locator.py) there is an attempt to import "warnings" from matplotlib.dates :

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)

But if you look at the doc or the code, you will find that there is no warnings in matplotlib.dates. Digging in this file history on github, one can find that a line :

import warnings

have been removed on 7 sept 2019, this is probably the reason of the issue you noticed. In Backtrader, there is a pull request awaiting for this issue : https://github.com/mementum/backtrader/pull/418

You can either apply the fix yourself to the code if you forked it, or wait for the PR to be merged

edited Jul 20, 2020 at 21:24

answered Jul 20, 2020 at 18:40

FFF

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9 Comments

Ryan Reid Over a year ago

Exactly. Thanks for the info

Ryan Reid Over a year ago

any idea how long it usually takes for something like this to be merged? Thanks

FFF Over a year ago

Well, no. It's complicated : the only maintainer of backtrader apply only fix, and on an very irregular basis. Some users are thinking of forking & making a new version (backtrader2) You can find discussion about this here : community.backtrader.com/topic/2553/backtrader-s-future You can find discussion to the issue you experience here : community.backtrader.com/topic/2784/…

FFF Over a year ago

Seems that if you want to fix this issue somehow quickly, you would have to do it yourself, on your computer, in file "backtrader/plot/locator.py" - line 39 : remove ", warnings". - line 30 : under "import datetime" add a new line with "import warnings"

squeegene Over a year ago

Hi guys, Just for posterity, I had this issue as well and reverted to matplotlib 3.1.1 (by doing pip uninstall matplotlib and pip install matplotlib=3.1.1 and it worked!! As for the _tkinter issue, that is separate from this specific matplotlib issue - you need to install the tkinter package - see stackoverflow.com/questions/48504746/…

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Erni Souza · Accepted Answer · 2021-03-16 01:18:39Z

1

I had the same issue... Am using python-3.6.13, conda-4.9.2, backtrader-1.9.76.123.dist-info.

It seems matplotlib version I was using (matplotlib-3.3.4) were the issue, even importing warnings (import warnings) did not resolve.

The solution for me was:
pip uninstall matplotlib
pip install matplotlib==3.2.2

Hope to help, thank you!

answered Mar 16, 2021 at 1:18

Erni Souza

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