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Comments on Automatically install all packages needed
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Automatically install all packages needed
When running various Python scripts, I often need to do this annoying dance:
$ python script.py
...
ModuleNotFoundError: No module named 'foo'
$ pip install foo
$ python script.py
...
ModuleNotFoundError: No module named 'bar'
$ pip install bar
$ python script.py
...
ModuleNotFoundError: No module named 'baz'
$ pip install baz
$ python script.py
(correct output from script)
Yes, I know this can be solved by creating a requirements.txt file, packaging the script, etc. But I'm asking about cases where that ship has sailed. All I have is a script that optimistically imports stuff.
Python already knows what package it's supposed to be, since it's named in the ModuleNotFoundError. Is there a way to tell Python to react by attempting a pip install on that, rather than raising an exception?
I am aware that:
-
ModuleNotFoundErrormay raise not just for missing packages, but also modules (eg.foo.py) in the same directory. I'm happy with a solution that blindly assumes it's always PyPi packages. -
Some packages use a different name for
pip installandimport. I'm happy with a solution that fails or installs the wrong package in this case. - It is dangerous to blindly install packages from PyPi. I'm okay with the risks.
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The following users marked this post as Works for me:
| User | Comment | Date |
|---|---|---|
| matthewsnyder | (no comment) | Jun 20, 2023 at 15:00 |
You can use pipreqs
- It will automate the generation of a requirements file.
- This can spare you the annoying dance without necessarily mixing environment setup and script execution.
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