Ubuntu Manpage: stubgen - Generate draft type hint stubs for Python modules

NAME

       stubgen - Generate draft type hint stubs for Python modules

SYNOPSIS

       stubgen [-h] [-py2] [-m MODULE] [-p PACKAGE] [OPTIONS...] [FILES...]

DESCRIPTION

       Mypy  is  a  static  type  checker  for  Python 3 and Python 2.7. Mypy includes the stubgen tool that can
       automatically generate stub files (.pyi files) for Python modules and C extension modules.

       A stub file (see PEP 484) contains only type hints for the public  interface  of  a  module,  with  empty
       function  bodies. Mypy can use a stub file instead of the real implementation to provide type information
       for the module. They are useful for third-party modules whose authors have not yet added type hints  (and
       when no stubs are available in typeshed) and C extension modules (which mypy can’t directly process).

       Stubgen  generates draft stubs. The auto-generated stub files often require some manual updates, and most
       types will default to Any. The stubs will be much more useful if you add more precise  type  annotations,
       at least for the most commonly used functionality.

OPTIONS

NOTE:
The command-line flags may change between releases.

Specifying what to stub
You can give stubgen paths of the source files for which you want to generate stubs:

$ stubgen foo.py bar.py

This generates stubs out/foo.pyi and out/bar.pyi. The default output directory out can be overridden with
:option:`-o DIR <-o>`
.

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You can also pass directories, and stubgen will recursively search them for any .py files and
generate stubs for all of them:

$ stubgen my_pkg_dir

Alternatively, you can give module or package names using the -m or -p options:

$ stubgen -m foo -m bar -p my_pkg_dir

Details of the options:

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.. option:: -m MODULE, --module MODULE

Generate a stub file for the given module. This flag may be repeated
multiple times.

Stubgen *will not* recursively generate stubs for any submodules of
the provided module.

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.. option:: -p PACKAGE, --package PACKAGE

Generate stubs for the given package. This flag maybe repeated
multiple times.

Stubgen *will* recursively generate stubs for all submodules of
the provided package. This flag is identical to :option:`--module` apart from
this behavior.

NOTE:
You can't mix paths and
:option:`-m`
/
:option:`-p`
options in the same stubgen invocation.

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Stubgen applies heuristics to avoid generating stubs for submodules that include tests or vendored
third-party packages.

Specifying how to generate stubs
By default stubgen will try to import the target modules and packages. This allows stubgen to use
runtime introspection to generate stubs for C extension modules and to improve the quality of the
generated stubs. By default, stubgen will also use mypy to perform light-weight semantic analysis of any
Python modules. Use the following flags to alter the default behavior:

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.. option:: --no-import

Don't try to import modules. Instead only use mypy's normal search mechanism to find
sources. This does not support C extension modules. This flag also disables
runtime introspection functionality, which mypy uses to find the value of
``__all__``. As result the set of exported imported names in stubs may be
incomplete. This flag is generally only useful when importing a module causes
unwanted side effects, such as the running of tests. Stubgen tries to skip test
modules even without this option, but this does not always work.

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.. option:: --parse-only

Don't perform semantic analysis of source files. This may generate
worse stubs -- in particular, some module, class, and function aliases may
be represented as variables with the ``Any`` type. This is generally only
useful if semantic analysis causes a critical mypy error.

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.. option:: --doc-dir PATH

Try to infer better signatures by parsing .rst documentation in ``PATH``.
This may result in better stubs, but currently it only works for C extension
modules.

Additional flags
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.. option:: --py2

Run stubgen in Python 2 mode (the default is Python 3 mode).

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.. option:: --ignore-errors

If an exception was raised during stub generation, continue to process any
remaining modules instead of immediately failing with an error.

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.. option:: --include-private

Include definitions that are considered private in stubs (with names such
as ``_foo`` with single leading underscore and no trailing underscores).

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.. option:: --export-less

Don't export all names imported from other modules within the same package.
Instead, only export imported names that are not referenced in the module
that contains the import.

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.. option:: --search-path PATH

Specify module search directories, separated by colons (only used if
:option:`--no-import` is given).

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.. option:: --python-executable PATH

Use Python interpreter at ``PATH`` for importing modules and runtime
introspection. This has no effect with :option:`--no-import`, and this only works
in Python 2 mode. In Python 3 mode the Python interpreter used to run stubgen
will always be used.

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.. option:: -o PATH, --output PATH

Change the output directory. By default the stubs are written in the
``./out`` directory. The output directory will be created if it doesn't
exist. Existing stubs in the output directory will be overwritten without
warning.

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.. option:: -v, --verbose

Produce more verbose output.

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.. option:: -q, --quiet

Produce less verbose output.

ENVIRONMENT

       MYPYPATH
              Additional module search path entries. The format is the same as the shell's $PATH:  one  or  more
              directory pathnames separated by colons.

AUTHOR