Import pyzbar error

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1

hey, trying to use
from pyzbar import pyzbar
on my code, but getting an exception.
Looked it up and ended up adding
libzbar-cffi
to the requirements file, but now i get a different issue:

ERROR: Failed building wheel for libzbar-cffi

when trying to run with the new addition to the requirements, anyone know what can i do to fix the original problem? the error with from pyzbar import pyzbar is:

File "/home/appuser/venv/lib/python3.7/site-packages/streamlit/scriptrunner/script_runner.py", line 475, in _run_script
    exec(code, module.__dict__)File "/app/streamlit-example/streamlit_app.py", line 14, in <module>
    from pyzbar import pyzbarFile "/home/appuser/venv/lib/python3.7/site-packages/pyzbar/pyzbar.py", line 7, in <module>
    from .wrapper import (File "/home/appuser/venv/lib/python3.7/site-packages/pyzbar/wrapper.py", line 155, in <module>
    c_uint_p,    # minorFile "/home/appuser/venv/lib/python3.7/site-packages/pyzbar/wrapper.py", line 148, in zbar_function
    return prototype((fname, load_libzbar()))File "/home/appuser/venv/lib/python3.7/site-packages/pyzbar/wrapper.py", line 127, in load_libzbar
    libzbar, dependencies = zbar_library.load()File "/home/appuser/venv/lib/python3.7/site-packages/pyzbar/zbar_library.py", line 65, in load
    raise ImportError('Unable to find zbar shared library')
2

Hi @avia, welcome to the Streamlit community!

Per the pzbar documentation, it appears the right library is libzbar0 for the packages.txt file. Can you try that instead?

Best,
Randy

3

Hey @randyzwitch , thanks!

I never realized what is that packages.txt file, is it streamlit related? would love some directions on how to use it

4

It’s part of the Streamlit Cloud specification for apps that need system-level dependencies:

Best,
Randy

5

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