Add type annotations to your source code
Project description
typeright: Generate Python Type Annotations
Insert PEP 484 type annotations into your python source code.
Options
typeright currently supports 4 approaches (aka "fixers") for inserting annotations, listed below.
Multiple fixers can be used in tandem: if an annotation exists, or is newly added by a previous fixer, all subsequent fixers will skip the location. The one exception to this is the docstring fixer, which will overwrite existing annotations if they do not agree with the types found in the docstrings, if any. In other words, when enabled, the docstrings are considered the source of truth for types.
The fixers are listed below in the order that they are called.
Read types from a json file
json file options:
Read type info from a json file
--type-info FILE JSON input file
--max-line-drift N Maximum allowed line drift when inserting annotation (can be useful for custom codecs)
--uses-signature JSON input uses a signature format
-s, --only-simple Only annotate functions with trivial types
If you have a tool that is able to generate type information, you can output
it in a format compatible with typeright and it will insert them as annotations.
The most common case for this would be if you're using
PyAnnotate to inspect types at
runtime (this project is itself a fork of PyAnnotate, focused solely on annotation
generation). Another scenario might be generating type info based on doxygen
xml files for a C extension, and adding these to stubs created by mypy's stubgen
tool.
Generate types from a command
command options:
Generate type info by calling an external program
--command COMMAND, -c COMMAND
Command to generate JSON info for a call site
With this option, you can use the mypy daemon, dmypy
, to generate annotations.
This tool will analyze your code to determine likely types for a function
based on the types of objects passed to it throughout your code.
To use this, first start the mypy daemon:
dmypy run
Next, invoke typeright
and pass it the command to run:
typeright --command='dmypy suggest --json {filename}:{lineno}' path/
It will run the given command on any function in path/
that does not have annotations.
I prefer to also pass --no-any
to ensure high quality suggestions only.
Convert types from docstrings
docstring options:
Generate type info by parsing docstrings
--doc-format {auto,google,numpy,off,rest}
Specify the docstring convention used within files to be converted ('auto' automatically determines the format by inspecting each docstring but it is faster and more reliable to specify this explicitly)
--doc-default-return-type TYPE
Default type to use for undocumented return values (defaults to 'Any'
Maintaining types in docstrings can be desirable for a few reasons:
- Your project has existing docstrings with types that are already mostly correct
- You find it easier to maintain and comprehend types specified alongside the description of an argument
typeright can parse the three major docstring conventions to find type info: numpy, google and restructuredText
Regardless of the docstring convention you choose, the types declared within your
docstrings should following the guidelines in PEP 484,
especially use of the typing
module, where necessary.
Set all types to Any
One approach to typing an exiting project is to start by blanketing your code
with types, so that you can enable mypy --disallow-untyped-defs
straight out of the gate. This gets the boilerplate out of the way, and
"encourages" developers to add types to all new modules.
any options:
-a, --auto-any Annotate everything with 'Any'
Output format options
There are options to control how to generate the type annotations:
output format options:
--annotation-style {auto,py2,py3}
Choose annotation style, py2 for Python 2 with comments, py3 for Python 3 with annotation syntax. The default will be determined by the version of the current python interpreter
--py2-comment-style {auto,multi,single}
Choose comment style, multi adds a comment per argument, single produces one type comment for all arguments, and auto chooses between the two styles based on the number of arguments and length of comments
Other options
other options:
-p, --print-function Assume print is a function
-w, --write Write output files
-j N, --processes N Use N parallel processes (default no parallelism)
-v, --verbose More verbose output
-q, --quiet Don't show diffs
-o OUTPUT_DIR, --output-dir OUTPUT_DIR
Put output files in this directory instead of overwriting the input files
-W, --write-unchanged-files
Also write files even if no changes were required (useful with --output-dir); implies -w.
Configuration
typeright will read defaults from a configuration file named typeright.ini
,
or setup.cfg
in the current directory.
For example:
[typeright]
files = typeright
command = dmypy suggest --json --no-any {filename}:{lineno}
docstring_format = numpy
write = true
Installation
This should work for Python 2.7 as well as for Python 3.6 and higher.
pip install typeright
Using as a pre-commit hook
We use pre-commit to fixup code prior to committing or pushing.
To set it up, cd
to this repo and run:
pip install pre-commit
pre-commit install
To manually run pre-commit on staged files:
pre-commit run
To manually run pre-commit on all files:
pre-commit run -a
Testing
To run the unit tests, use pytest:
pytest
Acknowledgments
This project was forked from PyAnnotate, after some encouragement from Guido van Rossum, because PyAnnotate is no longer being actively maintained.
Here are the original acknowledgments:
- Tony Grue
- Sergei Vorobev
- Jukka Lehtosalo
- Guido van Rossum
Licence etc.
- License: Apache 2.0.
- Copyright attribution: Copyright (c) 2017 Dropbox, Inc, and Chad Dombrova 2020.
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