[ python-Bugs-1071248 ] Documented grammar for List displays incorrect (testlist)

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Bugs item #1071248, was opened at 2004-11-22 12:26
Message generated for change (Comment added) made by kermode
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=105470&aid=1071248&group_id=5470

Category: Documentation
Group: Python 2.4
Status: Open
Resolution: None
Priority: 5
Submitted By: Lenard Lindstrom (kermode)
Assigned to: Jeremy Hylton (jhylton)
Summary: Documented grammar for List displays incorrect (testlist)

Initial Comment:
In section 5.2.4 of the Python Reference Manual for
Pythons 2.4 and 2.3 the definition

testlist ::= test ( "," test )* [ "," ]

should be

testlist ::= test [ ( "," test )+ [ "," ] ]

to conform with the definition of testlist_safe in the
Grammar definition file. In other words, a trailing
comma is not permitted if there is only one test in
testlist.


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>Comment By: Lenard Lindstrom (kermode)
Date: 2004-12-16 16:00

Message:
Logged In: YES 
user_id=663274

Python 2.4 (#60, Nov 30 2004, 11:49:19) [MSC v.1310 32 bit
(Intel)] on win32
Type "help", "copyright", "credits" or "license" for more
information.
>>> [x for x in 1,]
  File "<stdin>", line 1
    [x for x in 1,]
                  ^
SyntaxError: invalid syntax
>>> [x for x in 1,2,]
[1, 2]
>>> for x in 1,:
...     print x
...
1
>>>


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Comment By: engelbert gruber (grubert)
Date: 2004-12-15 00:50

Message:
Logged In: YES 
user_id=147070

but

>>> testlist = 1,
>>> testlist
(1,)

so testlist = 1 does not produce a list

testlist ::= one "," ( another "," )* [and [","]]

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