Python package to enforce optional dependencies
Project description
Necessary
Python package that can be used to enforce optional dependencies are installed when a module is imported. Necessary stads for "Now Ensures Correct Existence of Select Software, or Add Resource Yourself!"
Necessary is available on PyPI, and can be installed with the following command:
pip install necessary
How to Use
Simply use necessary.necessary
to get a context manager import a module.
from necessary import necessary
with necessary('torch'):
# this will raise a nicely written error if
# torch is not installed
import torch
If you want to just soft fail when a necessary module is not available (that is, have necessary return False
), use soft
:
try:
# assuming torch is not installed
necessary('torch')
except ImportError:
out = necessary('torch', soft=True)
assert out is False
If you want to request a minimum version, use min_version
:
with necessary(('torch', '1.12.0')):
# this will raise an error if
# torch is not installed or if
# the installed version is less than 0.12.0
import torch
You can also check multiple packages in the same necessary
call:
with necessary([('torch', '1.12.0'), 'numpy']):
# this will raise an error if torch >= 1.12.0 or numpy are not installed
import torch
import numpy
Finally, we can customize the message that is raised if a necessary module is not installed; use {module_name}
and {module_version}
to insert the module name and version respectively.
with necessary('torch', message='I am missing {module_name}/{module_version}'):
import torch
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