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bpo-42381: Allow walrus in set literals and set comprehensions (GH-23332)

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Currently walruses are not allowerd in set literals and set comprehensions:

>>> {y := 4, 4**2, 3**3}
  File "<stdin>", line 1
    {y := 4, 4**2, 3**3}
       ^
SyntaxError: invalid syntax

but they should be allowed as well per PEP 572
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Pablo Galindo 2020-11-17 01:17:12 +00:00 • committed by GitHub
parent a57b3d30f6
commit b0aba1fcdc
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4 changed files with 1680 additions and 1790 deletions
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@ -311,7 +311,6 @@ block[asdl_stmt_seq*] (memo):
| simple_stmt
| invalid_block
expressions_list[asdl_expr_seq*]: a[asdl_expr_seq*]=','.star_expression+ [','] { a }
star_expressions[expr_ty]:
| a=star_expression b=(',' c=star_expression { c })+ [','] {
_Py_Tuple(CHECK(asdl_expr_seq*, _PyPegen_seq_insert_in_front(p, a, b)), Load, EXTRA) }
@ -519,9 +518,9 @@ group[expr_ty]:
genexp[expr_ty]:
| '(' a=named_expression ~ b=for_if_clauses ')' { _Py_GeneratorExp(a, b, EXTRA) }
| invalid_comprehension
set[expr_ty]: '{' a=expressions_list '}' { _Py_Set(a, EXTRA) }
set[expr_ty]: '{' a=star_named_expressions '}' { _Py_Set(a, EXTRA) }
setcomp[expr_ty]:
| '{' a=expression ~ b=for_if_clauses '}' { _Py_SetComp(a, b, EXTRA) }
| '{' a=named_expression ~ b=for_if_clauses '}' { _Py_SetComp(a, b, EXTRA) }
| invalid_comprehension
dict[expr_ty]:
| '{' a=[double_starred_kvpairs] '}' {