Package requirements checker, plugin for flake8
This module provides a plug-in for flake8, which checks/validates package import requirements. It reports missing and/or not used project direct dependencies.
This plug-in adds new flake8 warnings:
- I900: Package is not listed as a requirement.
- I901: Package is require but not used.
In order to collect project’s dependencies, this checker evaluates Python code from the setup.py file stored in the project’s root directory. Code evaluation is done with the eval() function. As a fall-back method, this checker also tries to load dependencies from the requirements.txt file.
At this point it is very important to be aware of the consequences of the above approach. One might inject malicious code into the setup.py file, which will be executed by this checker. Hence, this checker shall NEVER be use to check code from an unknown source! However, in most cases, one validates code from a known source (e.g. own code) and one will run script stored in the setup.py file anyway. The worst case scenario is, that this checker will execute the equivalent of the python setup.py, which shall be idempotent (it’s a horribly designed setup.py file if it’s not).
If you have noticed some side effects during the flake8 check and your setup.py file is written in a standard way (e.g. pypa-sampleproject), please fill out a bug report.
You can install, upgrade, or uninstall flake8-requirements with these commands:
$ pip install flake8-requirements $ pip install --upgrade flake8-requirements $ pip uninstall flake8-requirements
For projects with custom (private) dependencies, one can provide mapping between project name and provided modules. Such a mapping can be set on the command line during the flake8 invocation with the --known-modules option or alternatively in the [flake8] section of the configuration file, e.g. setup.cfg. The syntax of the custom mapping looks like follows:
If some local project lacks “name” attribute in the setup.py file (it is highly discouraged not to provide the “name” attribute, though), one can omit the project name in the mapping and do as follows:
Real life example:
$ cat setup.cfg [flake8] max-line-length = 100 known-modules = my-lib:[mylib.drm,mylib.encryption]
If you use the -r flag in your requirements.txt file with more than one level of recursion (in other words, one file includes another, the included file includes yet another, and so on), add the --requirements-max-depth option to flake8 (for example, --requirements-max-depth=3 to allow three levels of recursion).
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