ImportError Cannot import name 'warnings' from 'matplotlib.dates

Question

Alpaca backtrader plot issue: I ran into this import issue and found this article, so I applied the code, but same issue not resolved. any one can help please?

My installed matplotlib version is 3.3.1 backtrader 1.9.76.123 python 3.8.5

the entire code posted below:

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)

import alpaca_backtrader_api

import backtrader as bt

from datetime import datetime

#import matplotlib
ALPACA_API_KEY = "XXXXX"

ALPACA_SECRET_KEY = "XXXX"

ALPACA_PAPER = True

class SmaCross(bt.SignalStrategy):

def init(self):

sma1, sma2 = bt.ind.SMA(period=10), bt.ind.SMA(period=30)

crossover = bt.ind.CrossOver(sma1, sma2)

self.signal_add(bt.SIGNAL_LONG, crossover)

cerebro = bt.Cerebro()

cerebro.addstrategy(SmaCross)

store = alpaca_backtrader_api.AlpacaStore( key_id=ALPACA_API_KEY,secret_key=ALPACA_SECRET_KEY,paper=ALPACA_PAPER)

if not ALPACA_PAPER:
  
  broker = store.getbroker() # or just alpaca_backtrader_api.AlpacaBroker()
  
  cerebro.setbroker(broker)
  
  DataFactory = store.getdata # or use alpaca_backtrader_api.AlpacaData
  
  data0 = DataFactory(dataname='AAPL', historical=True, fromdate=datetime(2015, 1, 1), timeframe=bt.TimeFrame.Days)
  
  cerebro.adddata(data0)
  
  print('Starting Portfolio Value: %.2f' % cerebro.broker.getvalue())
  
  cerebro.run()
  
  print('Final Portfolio Value: %.2f' % cerebro.broker.getvalue())
  
  cerebro.plot()

score 91 · Answer 1 · edited Nov 15 '20 at 10:21

91

Downgrade to matplotlib 3.2.2 until the bug in backtrader is fixed.

Here is the fix pull request: https://github.com/mementum/backtrader/pull/418.

pip uninstall matplotlib  # or conda
pip install matplotlib==3.2.2

edited Nov 15 '20 at 10:21

laffuste

16,287
8
84
91

answered Sep 19 '20 at 23:58

cambunctious

8,391
5
34
53

3

Does this work with Python 3.9? In my case it didn't work, I can't install this version of matplotlib. – Kr1 Jan 18 '21 at 10:14
PackagesNotFoundError using conda (miniforge/osx-arm) – ManuelSchneid3r May 12 '21 at 06:55

score 23 · Answer 2 · answered Aug 20 '20 at 12:52

23

I suffered the same problem like you did, your link provided has the perfect solution. just get rid of warnings from locator.py

https://community.backtrader.com/topic/981/importerror-cannot-import-name-min_per_hour-when-trying-to-plot/8

answered Aug 20 '20 at 12:52

pepCoder

317
1
8

1

This is the only answer that worked with Python 3.9 and Mac OS X Catalina. Find locator.py on your system and delete the 'warnings' argument from the import statement. See the post by Ch4r0n at the link given above in this answer. – Randall Blake Jun 18 '21 at 04:29

score 12 · Answer 3 · answered May 28 '21 at 13:53

I couldn't install matplotlib==3.2.2 nor the patch without uninstalling backtrader first.

So, this worked for me in the end:

Uninstall backtrader:
```
pip uninstall backtrader
```

Install the patch provided in the above solution:

pip install git+https://github.com/mementum/backtrader.git@0fa63ef4a35dc53cc7320813f8b15480c8f85517#egg=backtrader

If necessary, install matplotlib again:
```
pip install matplotlib
```

score 10 · Answer 4 · edited Jun 07 '21 at 13:37

10

As pointed out above, the issue is addressed in this pull request and the patch is the latest commit to master, but there hasn't been a release since 2019-05.

You can install the patched version like so:

pip install git+https://github.com/mementum/backtrader.git@0fa63ef4a35dc53cc7320813f8b15480c8f85517#egg=backtrader

You could alternatively specify the required commit in requirements.txt like so:

-e git+https://github.com/mementum/backtrader.git@0fa63ef4a35dc53cc7320813f8b15480c8f85517#egg=backtrader

…then pip install -r requirements.txt

After installing with either method, you can confirm the versions installed with pip freeze:

...
backtrader==1.9.76.123
...

How to install from git

edited Jun 07 '21 at 13:37

Joël Brigate

237
2
13

answered Mar 30 '21 at 13:20

ptim

14,902
10
83
103

This worked for me with python 3.9 as well. The option to add to the requirements .txt is a good tip – Tristan Isfeld Apr 12 '21 at 23:12
This is so weird. I have the exact same version of backtrader installed, yet it's still giving me the same error. – LeggoMaEggo Sep 21 '21 at 02:32

score 5 · Answer 5 · edited Jan 06 '21 at 20:29

5

Mac Big Sur for me it only worked if: Downgrade python3.9 to python 3.8 then I downgraded matplotlib==3.2.2

edited Jan 06 '21 at 20:29

Dharman

30,962
25
85
135

answered Jan 06 '21 at 20:23

UVN Vlad

51
1
2

score 4 · Answer 6 · answered Jul 02 '21 at 16:17

4

For both python 3.8.x and 3.9.x, I solved the problem by using specific version of matplotlib==3.2.2

pip install matplotlib==3.2.2

By default, I used matplotlib==3.4.x version and the problem occured.

answered Jul 02 '21 at 16:17

Seyed Hasan Mousavi

305
2
13

score 3 · Answer 7 · answered Jun 18 '22 at 06:44

All of the above answers are fine. The problem is not with Matplotlib though. The Backtrader library hasn't kept up with the Matplotlib updates. You can do the off-label Backtrader update suggested by Joel Brigate above...or you can make a simple mod to locator.py file (backtrader.plot):

Just change:

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)

You'll note that the warnings import now comes directly out of matplotlib rather than matplotlib.dates. This is the offending issue within locator.py.

score 2 · Answer 8 · answered Jul 31 '22 at 01:20

2

Here is my solution:

python -m pip uninstall matplotlib
python -m pip uninstall backtrader
python -m pip install backtrader
python -m pip install matplotlib==3.2.2

Enjoy!

answered Jul 31 '22 at 01:20

hlStack

21
2

score 1 · Answer 9 · answered Dec 11 '21 at 21:42

I could not install matplotlib==3.2.2 with python 3.9 .

Here is how did I fix this issue:

$ pip uninstall backtrader
$ pip install git+https://github.com/mementum/backtrader.git@0fa63ef4a35dc53cc7320813f8b15480c8f85517#egg=backtrader

Reference: Github: Fix ImportError from matplotlib.dates #418

score 0 · Answer 10 · edited Jun 07 '21 at 09:18

0

@laffuste solution of downgrading to version 3.2.2 of matplotlib solved the issue for me. PR to fix the issue is still open, you can also follow this forum for more info on the problem:

edited Jun 07 '21 at 09:18

Joël Brigate

237
2
13

answered Dec 30 '20 at 05:18

Joseph McAllister

1

score 0 · Answer 11 · answered Mar 15 '21 at 00:55

0

Mac Big Sur. I did the same: python 3.8.5, uninstall matplotlib, install matplotlib==3.2.2

I'm new at this so I first tried the easy way, through anaconda.org, but could not find version 3.2.2. Then tried it from the Jupyter notebook with conda install... didn't work. I finally did it straight through terminal, which worked fine.

answered Mar 15 '21 at 00:55

Miguel_D

11
2

Please provide the exact terminal commands you used. Remember to format as code. – user2901351 Mar 15 '21 at 12:25
1

pip install matplotlib==3.2.2 – Miguel_D Mar 17 '21 at 20:12

score 0 · Answer 12 · answered Mar 22 '23 at 04:16

0

I was able to install matplotlib==3.2.2 after installing freetype in a Mac with Apple silicon CPU.

brew install freetype
# then
pip install matplotlib==3.2.2 
# finally
pip install backtrader

answered Mar 22 '23 at 04:16

NicolasKittsteiner

4,280
1
20
17

ImportError Cannot import name 'warnings' from 'matplotlib.dates

12 Answers12

Linked

Related