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bpo-42202: Store func annotations as a tuple (GH-23316)

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Reduce memory footprint and improve performance of loading modules having many func annotations.

  >>> sys.getsizeof({"a":"int","b":"int","return":"int"})
  232
  >>> sys.getsizeof(("a","int","b","int","return","int"))
  88

The tuple is converted into dict on the fly when `func.__annotations__` is accessed first.

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
Co-authored-by: Inada Naoki <songofacandy@gmail.com>
This commit is contained in:
Yurii Karabas 2020-11-25 12:43:18 +02:00 • committed by GitHub
parent 85c84920f5
commit 7301979b23
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8 changed files with 174 additions and 155 deletions
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Lib/importlib/_bootstrap_external.py
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@ -311,6 +311,7 @@ _code_type = type(_write_atomic.__code__)
# Python 3.9a2 3425 (simplify bytecodes for **value unpacking)
# Python 3.10a1 3430 (Make 'annotations' future by default)
# Python 3.10a1 3431 (New line number table format -- PEP 626)
# Python 3.10a2 3432 (Function annotation for MAKE_FUNCTION is changed from dict to tuple bpo-42202)
#
# MAGIC must change whenever the bytecode emitted by the compiler may no
@ -320,7 +321,7 @@ _code_type = type(_write_atomic.__code__)
# Whenever MAGIC_NUMBER is changed, the ranges in the magic_values array
# in PC/launcher.c must also be updated.
MAGIC_NUMBER = (3431).to_bytes(2, 'little') + b'\r\n'
MAGIC_NUMBER = (3432).to_bytes(2, 'little') + b'\r\n'
_RAW_MAGIC_NUMBER = int.from_bytes(MAGIC_NUMBER, 'little') # For import.c
_PYCACHE = '__pycache__'