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bpo-40663: Correctly handle annotations with subscripts in ast_unparse.c (GH-20156)

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Batuhan Taskaya 2020-05-18 21:23:48 +03:00 committed by GitHub
parent e6578a226d
commit 2135e10dc7
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3 changed files with 17 additions and 1 deletions
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3
Lib/test/test_future.py
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@ -275,6 +275,9 @@ class AnnotationsFutureTestCase(unittest.TestCase):
eq("dict[str, int]")
eq("set[str,]")
eq("tuple[str, ...]")
eq("tuple[(str, *types)]")
eq("tuple[str, int, (str, int)]")
eq("tuple[(*int, str, str, (str, int))]")
eq("tuple[str, int, float, dict[str, int]]")
eq("slice[0]")
eq("slice[0:1]")

2
Misc/NEWS.d/next/Core and Builtins/2020-05-17-20-38-12.bpo-40663.u2aiZf.rst Normal file
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@ -0,0 +1,2 @@
Correctly generate annotations where parentheses are omitted but required
(e.g: ``Type[(str, int, *other))]``.

13
Python/ast_unparse.c
View File

@ -781,8 +781,19 @@ static int
append_ast_subscript(_PyUnicodeWriter *writer, expr_ty e)
{
APPEND_EXPR(e->v.Subscript.value, PR_ATOM);
int level = PR_TUPLE;
expr_ty slice = e->v.Subscript.slice;
if (slice->kind == Tuple_kind) {
for (Py_ssize_t i = 0; i < asdl_seq_LEN(slice->v.Tuple.elts); i++) {
expr_ty element = asdl_seq_GET(slice->v.Tuple.elts, i);
if (element->kind == Starred_kind) {
++level;
break;
}
}
}
APPEND_STR("[");
APPEND_EXPR(e->v.Subscript.slice, PR_TUPLE);
APPEND_EXPR(e->v.Subscript.slice, level);
APPEND_STR_FINISH("]");
}