New submission from Lysandros Nikolaou <lisandros...@gmail.com>:
A normal generator expression like (i for i in a) produces the following AST:
Module(
body=[
Expr(
value=GeneratorExp(
elt=Name(
id="i", ctx=Load(), lineno=1, col_offset=1, end_lineno=1,
end_col_offset=2
),
generators=[
comprehension(
target=Name(
id="i",
ctx=Store(),
lineno=1,
col_offset=7,
end_lineno=1,
end_col_offset=8,
),
iter=Name(
id="a",
ctx=Load(),
lineno=1,
col_offset=12,
end_lineno=1,
end_col_offset=13,
),
ifs=[],
is_async=0,
)
],
lineno=1,
*col_offset=0,*
end_lineno=1,
*end_col_offset=14,*
),
lineno=1,
col_offset=0,
end_lineno=1,
end_col_offset=14,
)
],
type_ignores=[],
)
But when calling a function with a generator expression as an argument,
something is off:
Module(
body=[
Expr(
value=Call(
func=Name(
id="f", ctx=Load(), lineno=1, col_offset=0, end_lineno=1,
end_col_offset=1
),
args=[
GeneratorExp(
elt=Name(
id="i",
ctx=Load(),
lineno=1,
col_offset=2,
end_lineno=1,
end_col_offset=3,
),
generators=[
comprehension(
target=Name(
id="i",
ctx=Store(),
lineno=1,
col_offset=8,
end_lineno=1,
end_col_offset=9,
),
iter=Name(
id="a",
ctx=Load(),
lineno=1,
col_offset=13,
end_lineno=1,
end_col_offset=14,
),
ifs=[],
is_async=0,
)
],
lineno=1,
*col_offset=1,*
end_lineno=1,
*end_col_offset=2,*
)
],
keywords=[],
lineno=1,
col_offset=0,
end_lineno=1,
end_col_offset=15,
),
lineno=1,
col_offset=0,
end_lineno=1,
end_col_offset=15,
)
],
type_ignores=[],
)
I'm not sure if this is intentional or not, because there is a call to
copy_location in Python/ast.c:3149. If this call to copy_location is removed,
the inconsistency goes away.
----------
components: Interpreter Core
messages: 359454
nosy: lys.nikolaou
priority: normal
severity: normal
status: open
title: Generator expression has wrong line/col info when inside a Call object
type: behavior
versions: Python 3.7, Python 3.8, Python 3.9
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue39235>
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