kivy-garden.matplotlib "cannot import name '_png' from 'matplotlib'"

[nooninm]

All five files below fail the same way. I discovered it following along in a Samuel POS course.
.kivy\garden\garden.matplotlib
backend_kivy.py
backend_kivyagg.py

.kivy\garden\garden.matplotlib\examples
test_backend.py
test_events.py
test_plt.py

All five files give the same error. Namely,
ImportError: cannot import name '_png' from 'matplotlib'

I have Python 3.8 and also a venv with 3.6.8. Same results.

[nooninm]

My video course seems to not need _png, so my solution for now is to simply comment out the line trying to import it. In my case it is line 256 of garden.matplotlib\backend_kivy.py like so:
#from matplotlib import _png

[dev-param]

did not work
same error here

[Mnikley]

Same error since upgrading to Kivy 2.0.0 and matplotlib 3.3.3

[fuddyduddy]

My video course seems to not need _png, so my solution for now is to simply comment out the line trying to import it. In my case it is line 256 of garden.matplotlib\backend_kivy.py like so:
#from matplotlib import _png

Tried this fix, but raised another problem.
My python version is 3.8.3,
Kivy version is 1.11.1 and
matplotlib 3.3.1
ImportError: cannot import name 'FigureCanvansKivyAgg' from 'kivy.garden.matplotlib.backend_kivyagg' (C:\Users\user\.kivy\garden\garden.matplotlib\backend_kivyagg.py)
Not yet tried the degrade matplotlib method, i hope this bug can be fixed soon.

[v15shm]

I am facing the same issue
certifi==2020.12.5
chardet==4.0.0
cycler==0.10.0
docutils==0.16
idna==2.10
Kivy==2.0.0
kivy-deps.angle==0.3.0
kivy-deps.glew==0.3.0
kivy-deps.gstreamer==0.3.1
kivy-deps.sdl2==0.3.1
Kivy-Garden==0.1.4
kiwisolver==1.3.1
matplotlib==3.3.3
numpy==1.19.5
pandas==1.2.0
Pillow==8.1.0
Pygments==2.7.4
pymongo==3.11.2
pyparsing==2.4.7
pypiwin32==223
python-dateutil==2.8.1
pytz==2020.5
pywin32==300
requests==2.25.1
six==1.15.0
urllib3==1.26.2

[badubies]

bump

[ChromaticIsobar]

I did a little bit of tests, this seems to affect usage with matplotlib versions >=3.3.0.
You could try downgrading your matplotlib versions until maintainers don't address this issue

pip install -U "matplotlib<3.3.0"

[ChromaticIsobar]

Also, this seems a duplicate of issues #58 and #67
Although this issue's title better captures what's the problem

[SalvishGoomanee]

from kivy.garden.matplotlib.backend_kivyagg import FigureCanvasKivyAgg

Everything was installed properly and I have no errors being picked up in the PyCharm IDE.
However upon running just the my .py file which includes the above. I get the error:

ImportError: cannot import name '_png' from 'matplotlib'

I have matplotlib version = latest, I tried to downgrade to version = 3.1.3 but it could not get install on my machine. I don't know why.

The downgrading option is really not optimal as I need latest version of mpl for other applications.

Thank you for suggesting some ways out of this!

[SalvishGoomanee]

UPDATE:

Commenting out from matplotlib import _png and from from matplotlib import _path as suggested in #58 (and #67) allows one to run a script with the line from kivy.garden.matplotlib.backend_kivyagg import FigureCanvasKivyAgg.

However upon testing it with a simple program like the one in the answer in https://stackoverflow.com/questions/44905416/how-to-get-started-use-matplotlib-in-kivy.

I get a bunch of errors:

line 623, in __getitem__ return dict.__getitem__(self, key) KeyError: 'datapath'

I hope this is clear and hope to get some advice on this! Many thanks!

UPDATE bis: So downgraded to 3.2.2 as @ChromaticIsobar suggested and it works but the depreciation isn't optimal so any other options, would be great! :)

[djiometsa]

I have a problem importing the _png from matplotlib while working with python and kivy.
After entering : from kivy.garden.matplotlib.backend_kivyagg import FigureCanvasKivyAgg in python file and running it, i receive the following Import Error. Please does some one have an idea how to solve the problem?

ImportError: cannot import name 'png' from 'matplotlib' (C:\Users\djiometsa-jiotio\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.8_qbz5n2kfra8p0\LocalCache\local-packages\Python38\site-packages\matplotlib_init.py)

I have the following versions of modules installed:
Kivy==2.0.0
kivy-deps.angle==0.3.0
kivy-deps.glew==0.3.0
kivy-deps.sdl2==0.3.1
Kivy-Garden==0.1.4
kivy-garden.graph==0.4.0
kiwisolver==1.3.2
matplotlib==3.2.2

Thanks for your proposals

[Mnikley]

@djiometsa what i did was the following:

1. navigate to C:\Users\USERNAME.kivy\garden\garden.matplotlib
2. Copy backend_kivy.py and backend_kivyagg.py to your local repository
3. Comment the following import in backend_kivy.py: # from matplotlib import _png
4. Import the kivy backend via your local, copied and commented .py files (e.g. from backend_kivy import FigureCanvasKivy)

i cant test it right now but this should get you on the right track for a temporary fix

[djiometsa]

It is still not working for me. After i did the fourth instruction, i had another Importerror

4. from backend_kivy import FigureCanvasKivy

ImportError: cannot import name 'FigureCanvasKivy' from partially initialized module 'backend_kivy' (most likely due to a circular import)

[Mnikley]

For me this works. Minimal reproducible example:

from kivy.uix.label import Label
from kivy.uix.boxlayout import BoxLayout
from kivy.app import App
from backend_kivy import FigureCanvasKivy

class TestApp(App):
    def build(self):
        root = BoxLayout(orientation='vertical')
        lbl = Label(text="[b]Some FigureCanvasKivy attributes:[/b]\n" + "\n".join(dir(FigureCanvasKivy)[-20:]), markup=True)
        root.add_widget(lbl)
        return root

if __name__ == '__main__':
    TestApp().run()

Source files as .zip

[SBS-EREHM]

For me this works. Minimal reproducible example:

from kivy.uix.label import Label
from kivy.uix.boxlayout import BoxLayout
from kivy.app import App
from backend_kivy import FigureCanvasKivy

Holy Crap, Batman (I mean @Mnikley). That works!

WTF with matplotlib _png?

And why is Kivy rated as #1 in "The 6 Best Python GUI Frameworks for Developers"?

[gustavofelicidade]

Guys, downgrading to 3.2.2 works for me