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bug in str.startswith() and str.endswith()

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  bug in str.startswith() and str.endswith() Ethan Furman <ethan@stoneleaf.us> - 2011-05-26 16:27 -0700
    Re: bug in str.startswith() and str.endswith() Mel <mwilson@the-wire.com> - 2011-05-26 21:07 -0400
    Re: bug in str.startswith() and str.endswith() Roy Smith <roy@panix.com> - 2011-05-26 21:13 -0400
      Re: bug in str.startswith() and str.endswith() Stefan Behnel <stefan_ml@behnel.de> - 2011-05-27 06:47 +0200
        Re: bug in str.startswith() and str.endswith() Roy Smith <roy@panix.com> - 2011-05-27 09:48 -0400

#6348 — bug in str.startswith() and str.endswith()

I've tried this in 2.5 - 3.2:

--> 'this is a test'.startswith('this')
True
--> 'this is a test'.startswith('this', None, None)
Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
TypeError: slice indices must be integers or None or have an __index__ 
method

The 3.2 docs say this:

str.startswith(prefix[, start[, end]])
Return True if string starts with the prefix, otherwise return False. 
prefix can also be a tuple of prefixes to look for. With optional start, 
test string beginning at that position. With optional end, stop 
comparing string at that position

str.endswith(suffix[, start[, end]])
Return True if the string ends with the specified suffix, otherwise 
return False. suffix can also be a tuple of suffixes to look for. With 
optional start, test beginning at that position. With optional end, stop 
comparing at that position.

Any reason this is not a bug?

~Ethan~

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#6356

Ethan Furman wrote:

> I've tried this in 2.5 - 3.2:
> 
> --> 'this is a test'.startswith('this')
> True
> --> 'this is a test'.startswith('this', None, None)
> Traceback (most recent call last):
>    File "<stdin>", line 1, in <module>
> TypeError: slice indices must be integers or None or have an __index__
> method
> 
> The 3.2 docs say this:
> 
> str.startswith(prefix[, start[, end]])
> Return True if string starts with the prefix, otherwise return False.
> prefix can also be a tuple of prefixes to look for. With optional start,
> test string beginning at that position. With optional end, stop
> comparing string at that position
> 
> str.endswith(suffix[, start[, end]])
> Return True if the string ends with the specified suffix, otherwise
> return False. suffix can also be a tuple of suffixes to look for. With
> optional start, test beginning at that position. With optional end, stop
> comparing at that position.
> 
> Any reason this is not a bug?

It's a wart at the very least.  The same thing happened in Python2 with 
range and xrange; there seemed no way to explicitly pass "default" 
arguments.

	Mel.

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#6357

In article <mailman.2136.1306451668.9059.python-list@python.org>,
 Ethan Furman <ethan@stoneleaf.us> wrote:

> --> 'this is a test'.startswith('this')
> True
> --> 'this is a test'.startswith('this', None, None)
> Traceback (most recent call last):
>    File "<stdin>", line 1, in <module>
> TypeError: slice indices must be integers or None or have an __index__ 
> method
[...]
> Any reason this is not a bug?

+1 for it being a bug.

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#6370

Roy Smith, 27.05.2011 03:13:
>   Ethan Furman wrote:
>
>> -->  'this is a test'.startswith('this')
>> True
>> -->  'this is a test'.startswith('this', None, None)
>> Traceback (most recent call last):
>>     File "<stdin>", line 1, in<module>
>> TypeError: slice indices must be integers or None or have an __index__
>> method
> [...]
>> Any reason this is not a bug?
>
> +1 for it being a bug.

Meaning that the right thing to do at this point is to file a bug report.

Stefan

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#6389

In article <mailman.2144.1306471679.9059.python-list@python.org>,
 Stefan Behnel <stefan_ml@behnel.de> wrote:

> Roy Smith, 27.05.2011 03:13:
> >   Ethan Furman wrote:
> >
> >> -->  'this is a test'.startswith('this')
> >> True
> >> -->  'this is a test'.startswith('this', None, None)
> >> Traceback (most recent call last):
> >>     File "<stdin>", line 1, in<module>
> >> TypeError: slice indices must be integers or None or have an __index__
> >> method
> > [...]
> >> Any reason this is not a bug?
> >
> > +1 for it being a bug.
> 
> Meaning that the right thing to do at this point is to file a bug report.

And now we just need to figure out if it's a bug in the code or the 
documentation :-)

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