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Nov 19, 2009, 4:36 PM
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[issue7364] Traceback contains incorrect line number for duplicate argument in lambda definition
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New submission from James Lingard <jchl [at] aristanetworks>:
The following python file:
lambda a, a: 0
when executed gives the following backtrace:
File "/tmp/test.py", line 0
SyntaxError: duplicate argument 'a' in function definition
Note that the line number is 0, not 1. (It's always 0, regardless of
the position in the file).
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Note that this doesn't happen for other similar errors in lambda
functions, for example the file:
lambda a=0, a: 0
leads to the following error message:
File "/tmp/test.py", line 1
lambda a=0, a: 0
SyntaxError: non-default argument follows default argument
and it also doesn't happen for the same error in a 'def':
def f(a, a): pass
leads to the following error message:
File "/tmp/test.py", line 1
def f(a, a): pass
SyntaxError: duplicate argument 'a' in function definition
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Tested on Python 2.6 (r26:66714, Jun 8 2009, 16:07:29).
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components: Interpreter Core
messages: 95518
nosy: james.lingard
severity: normal
status: open
title: Traceback contains incorrect line number for duplicate argument in lambda definition
type: behavior
versions: Python 2.6
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Python tracker <report [at] bugs>
<http://bugs.python.org/issue7364>
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