On 10 Jun 2005, at 20:38, Michael Chermside wrote:
> David Reitter writes:
>
>> Why does the following result in an IndexError?
>>
> [...]
>
> import re
> m = re.match('(?Pmaybe)?yes', "yes")
> m.group(1)
> m.group('maybe')
>
>> Traceback (most recent call last):
>> File
David Reitter writes:
> Why does the following result in an IndexError?
[...]
> >>> import re
> >>> m = re.match('(?Pmaybe)?yes', "yes")
> >>> m.group(1)
> >>> m.group('maybe')
> Traceback (most recent call last):
> File "", line 1, in ?
> IndexError: no such group
Because the name of the n
Peter Hansen wrote:
> [EMAIL PROTECTED] wrote:
>
>> Why does the following result in an IndexError?
>> I try to match an optional group, and then access it via its group
>> name. The group happens to not participate in the match, but is
>> obviously defined in the pattern.
>>
> m = re.match('(
david.reitter wrote:
> So I would expect None rather than an IndexError, which is (only?)
> supposed to occur "If a string argument is not used as a group name in
> the pattern".
That is exactly what does happen.
>
> I would expect named groups and numbered groups to be behave the same
> way.
>
[EMAIL PROTECTED] wrote:
> Why does the following result in an IndexError?
> I try to match an optional group, and then access it via its group
> name. The group happens to not participate in the match, but is
> obviously defined in the pattern.
>
m = re.match('(?Pmaybe)?yes', "yes")
Uh, don'
Why does the following result in an IndexError?
I try to match an optional group, and then access it via its group
name. The group happens to not participate in the match, but is
obviously defined in the pattern.
The documentation says that, at least for numbered groups, "If a group
is contained in
