Pandas recipe doesn't work

[tugsag]

Versions

• Python: 3.7.5
• OS: android
• Kivy: 2.0.0 master
• Cython: 0.29.21
• OpenJDK: 8

Description

I'm trying to include pandas via the requirements in buildozer.spec file. The apk builds ok, but when I try to run it on my device, I get the error: ImportError: dlopen failed: cannot locate symbol "_ZTVSt12length_error" referenced by "/data/data/org.test.matplotlib_testapp/files/app/_python_bundle/site-packages/pandas/_libs/window/aggregations.so"...

The curious thing is that this is supposedly addressed in the build recipe, but I still get the same error when trying to import pandas in my main.py file.

buildozer.spec

This is what the requirements line looks like in the spec file
requirements = python3==3.7.5,kivy==2.0.0,hostpython3==3.7.9,numpy,pandas

Command:

buildozer android debug

Logs

ImportError: dlopen failed: cannot locate symbol  "_ZTVSt12length_error" referenced by "/data/data/org.test.matplotlib_testapp/files/app/_python_bundle/site-packages/pandas/_libs/window/aggregations.so"..

[tshirtman]

I just forked my lottie demo repository to add pandas in the requirements, the package built and run on my phone, displaying a DataFrame.

https://github.com/tshirtman/p4a_pandas_test/actions/runs/579782702

you can grab the apk there and look at the code and configuration in the repository if it helps.

[RobertFlatt]

That comment in the recipe indicates libandroid.so was possibly not found.
That lib is part of the NDK.
No idea why that would be.

[tshirtman]

Apparently one needs to use p4a.branch=develop for pandas.

[HACKER-BYTE-HUE]

😄

[Revoluti0n]

I solved this using python lists to manage data instead of pandas module.. don't know if it's the best solution but its working now

[tugsag]

Yep, using develop branch fixed the issues. Thank you!

[tugsag]

It was working for a while, but using develop branch suddenly stopped working with the same dlopen failed issue. IDK why that would be. Everything else is the same

[yukhnovskiy]

@tugsag, have you solved a problem? Having same when running apk file built with kivy on Android 11 Sasmung S10e

[Revoluti0n]

@yukhnovskiy my app is working and stable so far using python native lists instead of pandas to manage data, same phone and also built with kivy

[yukhnovskiy]

@Revoluti0n thanks its possible way but not desired one, as a lot of refactoring is needed in my current project. Is there any workaround using pandas?

[yukhnovskiy]

btw here: https://github.com/kivy/python-for-android/blob/develop/pythonforandroid/recipes/pandas/__init__.py
was some sollution, but seems it stopped working.

[yukhnovskiy]

Changing in recipe.py "need_stl_shared = True" solved issue for me. And pandas works fine.

[Revoluti0n]

@yukhnovskiy good job, thanks for sharing