已安装模块但找不到 Brew 安装的共享库

Question

I need to install a module pyzbar which depends on another called zbar. According to the pypi link I first need to install zbar via

brew install zbar

then install the pyzbar

pip install pyzbar

Having done of that when trying to run a code based on importing specific part of the module, it gives an error.

from pyzbar.pyzbar import decode

The error is ImportError: Unable to find zbar shared library

How to check where exactly is the issue coming from and how to resolve it?

Here are steps I took after checking comments: 1- Tried finding libzbar file and some how link that to the path so that the pyzbar file zbar_library.py can find that. The libzbar files were in this location /opt/homebrew/Cellar/zbar/0.23.90 installed by homebrew and not in usr/local/lib (which surprisingly no such directory exists on my mac). The way I added the location of zbar lib file to path was by

export DYLD_LIBRARY_PATH=/opt/homebrew/lib

in the terminal while I'm in the conda environment on which my python is running. Now when trying to run python while importing pyzbar it finds something and no longer give the "no shared lib found" error, but gives the following errors:

  File "/Users/username/miniconda3/envs/my_env/lib/python3.7/site-packages/pyzbar/zbar_library.py", line 66, in load
    libzbar = cdll.LoadLibrary(path)
  File "/Users/username/miniconda3/envs/my_env/lib/python3.7/ctypes/__init__.py", line 442, in LoadLibrary
    return self._dlltype(name)
  File "/Users/username/miniconda3/envs/my_env/lib/python3.7/ctypes/__init__.py", line 364, in __init__
    self._handle = _dlopen(self._name, mode)
OSError: dlopen(/opt/homebrew/lib/libzbar.dylib, 6): no suitable image found.  Did find:
    /opt/homebrew/lib/libzbar.dylib: mach-o, but wrong architecture
    /opt/homebrew/Cellar/zbar/0.23.90/lib/libzbar.0.dylib: mach-o, but wrong architecture
    /opt/homebrew/lib/libzbar.dylib: mach-o, but wrong architecture
    /opt/homebrew/Cellar/zbar/0.23.90/lib/libzbar.0.dylib: mach-o, but wrong architecture

Answer 1

You may have multiple python/pip versions that caused such issue. To be sure about this, you can try

python3.9 -m pip install pyzbar

python3.9
from pyzbar.pyzbar import decode

If there are still any errors on import, please include a list of all installed pip packages by doing

pip freeze --all

Answer 2

Probably your operating system has two versions of python even if you have configured the path correctly your system installs the library in the default python and not in the version you want.

The default directory after installing python depends on your system.

You can install directly specifying which version will receive the library:

python3.9 -m pip install "package"
python3.7 -m pip install "package"
python2.7 -m pip install "package"

It is always recommended to use a version manager, virtual environment that separates the versions and can be used individually

reference install package