Griffe

Signatures for entire Python programs. Extract the structure, the frame, the skeleton of your project, to generate API documentation or find breaking changes in your API.

Griffe, pronounced "grif" (/ɡʁif/), is a french word that means "claw", but also "signature" in a familiar way. "On reconnaît bien là sa griffe."

Installation

With pip:

pip install griffe

With pipx:

python3.7 -m pip install --user pipx
pipx install griffe

Usage

On the command line, pass the names of packages to the griffe dump command:

$ griffe dump httpx fastapi
{
  "httpx": {
    "name": "httpx",
    ...
  },
  "fastapi": {
    "name": "fastapi",
    ...
  }
}

See the Dumping data section for more examples.

Or pass a relative path to the griffe check command:

$ griffe check mypackage --verbose
mypackage/mymodule.py:10: MyClass.mymethod(myparam):
Parameter kind was changed:
  Old: positional or keyword
  New: keyword-only

For src layouts:

$ griffe check --search src mypackage --verbose
src/mypackage/mymodule.py:10: MyClass.mymethod(myparam):
Parameter kind was changed:
  Old: positional or keyword
  New: keyword-only

See the API breakage section for more examples.

With Python, loading a package:

import griffe

fastapi = griffe.load("fastapi")

Finding breaking changes:

import griffe

previous = griffe.load_git("mypackage", ref="0.2.0")
current = griffe.load("mypackage")

for breakage in griffe.find_breaking_changes(previous, current):
    ...

See the Loading data section for more examples.

Todo

• Visitor/Inspector:
  • Merging inherited members into class. Needs to be able to post-process classes, and to compute their MRO (C3Linearization, see docspec/pydocspec issues).
• Extensions
  • Post-processing extensions
  • Third-party libraries we could provide support for:
    • Django support
    • Marshmallow support
    • Pydantic support
• Docstrings parsers
  • epydoc
  • New Markdown-based format? For graceful degradation
• Serializer:
  • Flat JSON
  • JSON schema
• API diff:
  • Mechanism to cache APIs? Should users version them, or store them somewhere (docs)?
  • Ability to return warnings (things that are not backward-compatibility-friendly)
  • List of things to consider for warnings
    • Multiple positional-or-keyword parameters
    • Public imports in public modules
    • Private things made public through imports/assignments
    • Too many public things? Generally annoying. Configuration?
  • Ability to compare two APIs to return breaking changes
  • List of things to consider for breaking changes
    • Changed position of positional only parameter
    • Changed position of positional or keyword parameter
    • Changed type of parameter
    • Changed type of public module attribute
    • Changed return type of a public function/method
    • Added parameter without a default value
    • Removed keyword-only parameter without a default value, without **kwargs to swallow it
    • Removed positional-only parameter without a default value, without *args to swallow it
    • Removed positional-or_keyword argument without a default value, without *args and **kwargs to swallow it
    • Removed public module/class/function/method/attribute
    • All of the previous even when parent is private (could be publicly imported or assigned somewhere), and later be smarter: public assign/import makes private things public!
    • Inheritance: removed, added or changed base that changes MRO