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bpo-35975: Support parsing earlier minor versions of Python 3 (GH-12086)

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This adds a `feature_version` flag to `ast.parse()` (documented) and `compile()` (hidden) that allow tweaking the parser to support older versions of the grammar. In particular if `feature_version` is 5 or 6, the hacks for the `async` and `await` keyword from PEP 492 are reinstated. (For 7 or higher, these are unconditionally treated as keywords, but they are still special tokens rather than `NAME` tokens that the parser driver recognizes.)



https://bugs.python.org/issue35975
This commit is contained in:
Guido van Rossum 2019-03-07 12:38:08 -08:00 • committed by Miss Islington (bot)
parent bf94cc7b49
commit 495da29225
29 changed files with 476 additions and 201 deletions
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2
Lib/test/test_parser.py
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@ -916,7 +916,7 @@ class STObjectTestCase(unittest.TestCase):
return (n + 3) & ~3
return 1 << (n - 1).bit_length()
basesize = support.calcobjsize('Pii')
basesize = support.calcobjsize('Piii')
nodesize = struct.calcsize('hP3iP0h2i')
def sizeofchildren(node):
if node is None: