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Python: Add support for PEP-798 #21695

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4b5ff0b
Python: Support unpacking in comprehensions in `tree-sitter-python`
tausbn Apr 10, 2026
97086c3
Python: Regenerate parser files
tausbn Apr 10, 2026
91d4cf6
Python: Update `python.tsg`
tausbn Apr 10, 2026
90b6461
Python: Also fix `(value, key)` bug in old parser
tausbn Apr 10, 2026
fc5b356
Python: Add parser test for comprehensions with unpacking
tausbn Apr 10, 2026
de900fc
Python: Add QL test for comprehensions with unpacking
tausbn Apr 10, 2026
15790aa
Python: Add change note
tausbn Apr 10, 2026
8b1ecf0
Python: Update test output
tausbn Apr 10, 2026
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2 changes: 1 addition & 1 deletion python/extractor/semmle/python/parser/ast.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1432,7 +1432,7 @@ def rewrite_comp(node):
elt = node.elt
del node.elt
else:
elt = ast.Tuple([node.value, node.key], LOAD)
elt = ast.Tuple([node.key, node.value], LOAD)
elt.lineno = node.key.lineno
elt.col_offset = node.key.col_offset
elt._end = node.value._end
Expand Down
285 changes: 285 additions & 0 deletions python/extractor/tests/parser/unpacking_in_comprehensions_new.expected
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Original file line number Diff line number Diff line change
@@ -0,0 +1,285 @@
Module: [4, 0] - [20, 0]
body: [
Expr: [4, 0] - [4, 15]
value:
ListComp: [4, 0] - [4, 15]
elt: None
generators: None
function:
Function: [4, 0] - [4, 15]
name: 'listcomp'
type_parameters: []
args: [
Name: [4, 0] - [4, 15]
variable: Variable('.0', None)
ctx: Param
]
vararg: None
kwonlyargs: None
kwarg: None
body: [
For: [4, 0] - [4, 15]
target:
Name: [4, 8] - [4, 9]
variable: Variable('x', None)
ctx: Store
iter:
Name: [4, 0] - [4, 15]
variable: Variable('.0', None)
ctx: Load
body: [
Expr: [4, 1] - [4, 3]
value:
YieldFrom: [4, 1] - [4, 3]
value:
Name: [4, 2] - [4, 3]
variable: Variable('x', None)
ctx: Load
]
orelse: None
]
iterable:
Name: [4, 13] - [4, 14]
variable: Variable('y', None)
ctx: Load
Expr: [7, 0] - [7, 15]
value:
SetComp: [7, 0] - [7, 15]
elt: None
generators: None
function:
Function: [7, 0] - [7, 15]
name: 'setcomp'
type_parameters: []
args: [
Name: [7, 0] - [7, 15]
variable: Variable('.0', None)
ctx: Param
]
vararg: None
kwonlyargs: None
kwarg: None
body: [
For: [7, 0] - [7, 15]
target:
Name: [7, 8] - [7, 9]
variable: Variable('x', None)
ctx: Store
iter:
Name: [7, 0] - [7, 15]
variable: Variable('.0', None)
ctx: Load
body: [
Expr: [7, 1] - [7, 3]
value:
YieldFrom: [7, 1] - [7, 3]
value:
Name: [7, 2] - [7, 3]
variable: Variable('x', None)
ctx: Load
]
orelse: None
]
iterable:
Name: [7, 13] - [7, 14]
variable: Variable('y', None)
ctx: Load
Expr: [10, 0] - [10, 20]
value:
DictComp: [10, 0] - [10, 20]
key: None
value: None
generators: None
function:
Function: [10, 0] - [10, 20]
name: 'dictcomp'
type_parameters: []
args: [
Name: [10, 0] - [10, 20]
variable: Variable('.0', None)
ctx: Param
]
vararg: None
kwonlyargs: None
kwarg: None
body: [
For: [10, 0] - [10, 20]
target:
Name: [10, 9] - [10, 10]
variable: Variable('d', None)
ctx: Store
iter:
Name: [10, 0] - [10, 20]
variable: Variable('.0', None)
ctx: Load
body: [
Expr: [10, 1] - [10, 4]
value:
YieldFrom: [10, 1] - [10, 4]
value:
Call: [10, 3] - [10, 4]
func:
Attribute: [10, 3] - [10, 4]
value:
Name: [10, 3] - [10, 4]
variable: Variable('d', None)
ctx: Load
attr: 'items'
ctx: Load
positional_args: []
named_args: []
]
orelse: None
]
iterable:
Name: [10, 14] - [10, 19]
variable: Variable('dicts', None)
ctx: Load
Expr: [13, 0] - [13, 15]
value:
GeneratorExp: [13, 1] - [13, 14]
elt: None
generators: None
function:
Function: [13, 1] - [13, 14]
name: 'genexpr'
type_parameters: []
args: [
Name: [13, 1] - [13, 14]
variable: Variable('.0', None)
ctx: Param
]
vararg: None
kwonlyargs: None
kwarg: None
body: [
For: [13, 1] - [13, 14]
target:
Name: [13, 8] - [13, 9]
variable: Variable('x', None)
ctx: Store
iter:
Name: [13, 1] - [13, 14]
variable: Variable('.0', None)
ctx: Load
body: [
Expr: [13, 1] - [13, 3]
value:
YieldFrom: [13, 1] - [13, 3]
value:
Name: [13, 2] - [13, 3]
variable: Variable('x', None)
ctx: Load
]
orelse: None
]
iterable:
Name: [13, 13] - [13, 14]
variable: Variable('y', None)
ctx: Load
parenthesised: True
Expr: [16, 0] - [16, 20]
value:
ListComp: [16, 0] - [16, 20]
elt: None
generators: None
function:
Function: [16, 0] - [16, 20]
name: 'listcomp'
type_parameters: []
args: [
Name: [16, 0] - [16, 20]
variable: Variable('.0', None)
ctx: Param
]
vararg: None
kwonlyargs: None
kwarg: None
body: [
For: [16, 0] - [16, 20]
target:
Name: [16, 8] - [16, 9]
variable: Variable('x', None)
ctx: Store
iter:
Name: [16, 0] - [16, 20]
variable: Variable('.0', None)
ctx: Load
body: [
If: [16, 18] - [16, 19]
test:
Name: [16, 18] - [16, 19]
variable: Variable('x', None)
ctx: Load
body: [
Expr: [16, 1] - [16, 3]
value:
YieldFrom: [16, 1] - [16, 3]
value:
Name: [16, 2] - [16, 3]
variable: Variable('x', None)
ctx: Load
]
orelse: None
]
orelse: None
]
iterable:
Name: [16, 13] - [16, 14]
variable: Variable('y', None)
ctx: Load
Expr: [19, 0] - [19, 26]
value:
ListComp: [19, 0] - [19, 26]
elt: None
generators: None
function:
Function: [19, 0] - [19, 26]
name: 'listcomp'
type_parameters: []
args: [
Name: [19, 0] - [19, 26]
variable: Variable('.0', None)
ctx: Param
]
vararg: None
kwonlyargs: None
kwarg: None
body: [
For: [19, 0] - [19, 26]
target:
Name: [19, 8] - [19, 9]
variable: Variable('y', None)
ctx: Store
iter:
Name: [19, 0] - [19, 26]
variable: Variable('.0', None)
ctx: Load
body: [
For: [19, 0] - [19, 26]
target:
Name: [19, 19] - [19, 20]
variable: Variable('x', None)
ctx: Store
iter:
Name: [19, 24] - [19, 25]
variable: Variable('y', None)
ctx: Load
body: [
Expr: [19, 1] - [19, 3]
value:
YieldFrom: [19, 1] - [19, 3]
value:
Name: [19, 2] - [19, 3]
variable: Variable('x', None)
ctx: Load
]
orelse: None
]
orelse: None
]
iterable:
Name: [19, 13] - [19, 14]
variable: Variable('z', None)
ctx: Load
]
19 changes: 19 additions & 0 deletions python/extractor/tests/parser/unpacking_in_comprehensions_new.py
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Original file line number Diff line number Diff line change
@@ -0,0 +1,19 @@
# PEP 798: Unpacking in comprehensions

# Star unpacking in list comprehension
[*x for x in y]

# Star unpacking in set comprehension
{*x for x in y}

# Double-star unpacking in dict comprehension
{**d for d in dicts}

# Star unpacking in generator expression
(*x for x in y)

# With conditions
[*x for x in y if x]

# Multiple for clauses
[*x for y in z for x in y]
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