Bugs item #1531016, was opened at 2006-07-29 20:21
Message generated for change (Comment added) made by sean_gillespie
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Category: Parser/Compiler
Group: Python 2.4
Status: Open
Resolution: None
Priority: 2
Private: No
Submitted By: Roman Suzi (rnd0110)
Assigned to: Nobody/Anonymous (nobody)
Summary: Comma not allowed at the end of argument list for **argument
Initial Comment:
This tells it all:
>>> str('sdfd', **a,)
File "<stdin>", line 1
str('sdfd', **a,)
^
SyntaxError: invalid syntax
>>> str('sdfd', *a,)
File "<stdin>", line 1
str('sdfd', *a,)
^
SyntaxError: invalid syntax
While the docs tell otherwise:
http://docs.python.org/ref/calls.html
While having arguments after ** doesn't make sense,
comma after ANY kinds of arguments seem to be more
consistent.
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Comment By: Sean Gillespie (sean_gillespie)
Date: 2007-03-16 14:42
Message:
Logged In: YES
user_id=1744567
Originator: NO
This behavior seems as intended. According to the docs
(http://docs.python.org/ref/calls.html):
A trailing comma may be present after the positional and keyword arguments
but does not affect the semantics.
[snip]
Formal parameters using the syntax "*identifier" or "**identifier" cannot
be used as positional argument slots or as keyword argument names.
I'm having trouble with what this actually means. However, the relevant
section in the Grammar looks like this:
arglist: (argument ',')* (argument [',']| '*' test [',' '**' test] | '**'
test )
It looks like this logic was explicitly coded.
If this is determined to be a bug, we can just add [','] after the test in
both cases.
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