[PATCH v3 00/13] qapi: static typing conversion, pt2

[John Snow]

Hi, this series adds static type hints to the QAPI module.
This is part two, and covers introspect.py.

Part 2: https://gitlab.com/jsnow/qemu/-/tree/python-qapi-cleanup-pt2
Everything: https://gitlab.com/jsnow/qemu/-/tree/python-qapi-cleanup-pt6

- Requires Python 3.6+
- Requires mypy 0.770 or newer (for type analysis only)
- Requires pylint 2.6.0 or newer (for lint checking only)

Type hints are added in patches that add *only* type hints and change no
other behavior. Any necessary changes to behavior to accommodate typing
are split out into their own tiny patches.

Every commit should pass with:
 - flake8 qapi/
 - pylint --rcfile=qapi/pylintrc qapi/
 - mypy --config-file=qapi/mypy.ini qapi/

V3:
 - Dropped all the R-Bs again...
 - Re-re-ordered to put type annotations last again.
 - Rebased on top of "pt1.5".
 - Ensured compliance with strict-optional typing.
 - Forgive me if I missed a specific critique;
   I probably just lost it in the shuffle.

V2:
 - Dropped all R-B from previous series; enough has changed.
 - pt2 is now introspect.py, expr.py is pushed to pt3.
 - Reworked again to have less confusing (?) type names
 - Added an assertion to prevent future accidental breakage

John Snow (13):
  qapi/introspect.py: assert schema is not None
  qapi/introspect.py: use _make_tree for features nodes
  qapi/introspect.py: add _gen_features helper
  qapi/introspect.py: guard against ifcond/comment misuse
  qapi/introspect.py: Unify return type of _make_tree()
  qapi/introspect.py: replace 'extra' dict with 'comment' argument
  qapi/introspect.py: Introduce preliminary tree typing
  qapi/introspect.py: create a typed 'Annotated' data strutcure
  qapi/introspect.py: improve _tree_to_qlit error message
  qapi/introspect.py: improve readability of _tree_to_qlit
  qapi/introspect.py: add type hint annotations
  qapi/instrospect.py: add introspect.json dummy types
  qapi/introspect.py: Add docstring to _tree_to_qlit

 scripts/qapi/introspect.py | 309 ++++++++++++++++++++++++++-----------
 scripts/qapi/mypy.ini      |   5 -
 scripts/qapi/schema.py     |   2 +-
 3 files changed, 219 insertions(+), 97 deletions(-)

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2.26.2