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| author | Guido van Rossum <guido@python.org> | 2019-03-07 12:38:08 -0800 |
|---|---|---|
| committer | Miss Islington (bot) <31488909+miss-islington@users.noreply.github.com> | 2019-03-07 12:38:08 -0800 |
| commit | 495da292255b92dd73758fdd0e4c7d27d82b1e57 (patch) | |
| tree | 1378cf049d2d125593fa970ea1e9a9f77604fab1 /Lib/ast.py | |
| parent | bf94cc7b496a379e1f604aa2e4080bb70ca4020e (diff) | |
| download | cpython-git-495da292255b92dd73758fdd0e4c7d27d82b1e57.tar.gz | |
bpo-35975: Support parsing earlier minor versions of Python 3 (GH-12086)
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
Diffstat (limited to 'Lib/ast.py')
| -rw-r--r-- | Lib/ast.py | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/Lib/ast.py b/Lib/ast.py index 470a74b3b5..64e7a2551f 100644 --- a/Lib/ast.py +++ b/Lib/ast.py @@ -27,7 +27,8 @@ from _ast import * -def parse(source, filename='<unknown>', mode='exec', *, type_comments=False): +def parse(source, filename='<unknown>', mode='exec', *, + type_comments=False, feature_version=-1): """ Parse the source into an AST node. Equivalent to compile(source, filename, mode, PyCF_ONLY_AST). @@ -36,7 +37,8 @@ def parse(source, filename='<unknown>', mode='exec', *, type_comments=False): flags = PyCF_ONLY_AST if type_comments: flags |= PyCF_TYPE_COMMENTS - return compile(source, filename, mode, flags) + return compile(source, filename, mode, flags, + feature_version=feature_version) def literal_eval(node_or_string): |