A linter to check arguments in Python docstrings
Project description
pydoclint
A Python docstring linter to check whether a docstring's sections (arguments, returns, raises, ...) match the function signature or function implementation.
It runs really fast. In fact, it is at least 30,000 times faster than darglint (another linter of the same purposes which is no longer maintained).
Here is a comparison of running time on some famous Python projects:
pydoclint | darglint | |
---|---|---|
numpy | 0.08 sec | > 40 min (> 30,000x) |
scikit-learn | 0.09 sec | > 40 min (> 30,000x) |
Currently, pydoclint
only works when you write your docstrings in the numpy stlyle. Support for the Google style docstrings will be added soon.
Note: this linter and pydocstyle serves complementary purposes. It is recommended that you use both together.
1. Installation
pip install pydoclint
Note that pydoclint
only supports Python 3.8 and above.
2. Usage
2.1. As a standalone command line tool
pydoclint <FILE_OR_FOLDER>
Replace <FILE_OR_FOLDER>
with the file/folder names you want, such as .
.
2.2. As a flake8 plugin
Once you install pydoclint
you will have also installed flake8
. Then you can run:
flake8 --select=DOC <FILE_OR_FOLDER>
If you don't include --select=DOC
in your command, flake8
will also run other built-in flake8 linters on your code.
3. Style violation codes
pydoclint
currently has the following style violation codes:
3.1. DOC1xx
: Violations about input arguments
Code | Explanation |
---|---|
DOC101 |
Docstring contains fewer arguments than in function signature |
DOC102 |
Docstring contains more arguments than in function signature |
DOC103 |
Docstring arguments are different from function arguments. (Or did you miss the space between the argument name and the ":" in the docstring?) |
DOC104 |
Arguments are the same in the docstring and the function signature, but are in a different order. |
DOC105 |
Argument names match, but type hints do not match |
3.2. DOC2xx
: Violations about return argument(s)
Code | Explanation |
---|---|
DOC201 |
Function/method does not have a return section in docstring |
DOC202 |
Function/method has a return section in docstring, but there are no return statements or annotations |
3.3. DOC3xx
: Violations about class docstring and class constructor
Code | Explanation |
---|---|
DOC301 |
__init__() should not have a docstring; please combine it with the docstring of the class |
DOC302 |
The docstring for the class does not need a "Returns" sections |
3.4. DOC4xx
: Violations about "yield" statements
Code | Explanation |
---|---|
DOC401 |
Function/method returns a Generator, but the docstring does not have a "Yields" section |
DOC402 |
Function/method has "yield" statements, but the docstring does not have a "Yields" section |
DOC403 |
Function/method has a "Yields" section in the docstring, but there are no "yield" statements or a Generator return annotation |
3.5. DOC5xx
: Violations about "raise" statements
Code | Explanation |
---|---|
DOC501 |
Function/method has "raise" statements, but the docstring does not have a "Raises" section |
DOC502 |
Function/method has a "Raises" section in the docstring, but there are not "raise" statements in the body |
4. Configuration options
There are several configuration options available. They can be used invidually or together.
4.1. --check-type-hint
(shortform: -th
, default: True
)
If True
, the type hints in the docstring and in the Python code need to exactly match.
To turn this optoin on/off, do this:
pydoclint --check-type-hint=False <FILE_OR_FOLDER>
or
flake8 --check-type-hint=False <FILE_OR_FOLDER>
4.2. --check-arg-order
(shortform: -ao
, default: True
)
If True
, the input argument order in the docstring needs to match that in the function signature.
To turn this optoin on/off, do this:
pydoclint --check-arg-order=False <FILE_OR_FOLDER>
or
flake8 --check-arg-order=False <FILE_OR_FOLDER>
4.3. --skip-checking-short-docstrings
(shortform: -scsd
, default: True
)
If True
, pydoclint
won't check functions that have only a short description in their docstring.
To turn this optoin on/off, do this:
pydoclint --skip-checking-short-docstrings=False <FILE_OR_FOLDER>
or
flake8 --skip-checking-short-docstrings=False <FILE_OR_FOLDER>
4.4. --skip-checking-raises
(shortform: -scr
, default: False
)
If True
, pydoclint
won't report DOC501
or DOC502
if there are raise
statements in the function/method but there aren't any "raises" sections in the docstring (or vice versa).
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