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Docker – Disable python package imports depending on available libraries

In my python-based project I am using several functions from PySide6. These functions require libraries such as libGl.so and libglib.so. This is not a problem when using the package as a standalone-package.

When packaging it into a docker-image and using python:3.12 or similar base images, I however have to add

RUN apt-get update && apt-get install ffmpeg libsm6 libxext6 libegl-dev -y

during build-time, to add these packages. As I try to keep my resulting image as small as possible, I would like to avoid this step.

Is there any way of using something similar as (e.g.) preprocessor routines in C++, to selectively disable imports depending on availability of libraries? I am aware of that this might also disable other functions, but for the purpose of this question this is not relevant, as I don’t use these functions anyway in the volume-context.

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2

Answers


  1. 0

    You could use following structure, to import only available packages:

    try:
    import some_module
except ImportError:
    some_module = None

if some_module:
    pass
else:
    pass
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  2. 0

    you can conditionally import modules based on the availability of external libraries by using a try-except block

    try:
    from PySide6 import <your_library>
except ImportError:
    pass

    This way, the import will only happen if the required libraries are available

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