I find a bug in str.lstrip, when i call str.lstrip, i get this result.
tiny➜ ~ python Python 2.7.5+ (default, Feb 27 2014, 19:37:08) [GCC 4.8.1] on linux2 Type "help", "copyright", "credits" or "license" for more information.
a='device_info' a.lstrip('device')
'_info'
a.lstrip('device_')
'nfo'
tiny➜ ~ uname -a Linux tinymint 3.11.0-12-generic #19-Ubuntu SMP Wed Oct 9 16:20:46 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux tiny➜ ~
On Wed, Mar 11, 2015 at 4:27 AM, lou xiao lox.xiao@gmail.com wrote:
I find a bug in str.lstrip, when i call str.lstrip, i get this result.
tiny➜ ~ python Python 2.7.5+ (default, Feb 27 2014, 19:37:08) [GCC 4.8.1] on linux2 Type "help", "copyright", "credits" or "license" for more information.
a='device_info' a.lstrip('device')
'_info'
a.lstrip('device_')
'nfo'
tiny➜ ~ uname -a Linux tinymint 3.11.0-12-generic #19-Ubuntu SMP Wed Oct 9 16:20:46 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux tiny➜ ~
It's not a bug, because it isn't doing what you think it is. It strips a *set of characters*, not a prefix string.
https://docs.python.org/2/library/stdtypes.html#str.lstrip https://docs.python.org/3/library/stdtypes.html#str.lstrip
ChrisA
ths, i misunderstood the method
2015-03-11 1:33 GMT+08:00 Chris Angelico rosuav@gmail.com:
On Wed, Mar 11, 2015 at 4:27 AM, lou xiao lox.xiao@gmail.com wrote:
I find a bug in str.lstrip, when i call str.lstrip, i get this result.
tiny➜ ~ python Python 2.7.5+ (default, Feb 27 2014, 19:37:08) [GCC 4.8.1] on linux2 Type "help", "copyright", "credits" or "license" for more information.
a='device_info' a.lstrip('device')
'_info'
a.lstrip('device_')
'nfo'
tiny➜ ~ uname -a Linux tinymint 3.11.0-12-generic #19-Ubuntu SMP Wed Oct 9 16:20:46 UTC
2013
x86_64 x86_64 x86_64 GNU/Linux tiny➜ ~
It's not a bug, because it isn't doing what you think it is. It strips a *set of characters*, not a prefix string.
https://docs.python.org/2/library/stdtypes.html#str.lstrip https://docs.python.org/3/library/stdtypes.html#str.lstrip
ChrisA
On Tue, Mar 10, 2015 at 2:27 PM, lou xiao lox.xiao@gmail.com wrote:
tiny➜ ~ python Python 2.7.5+ (default, Feb 27 2014, 19:37:08) [GCC 4.8.1] on linux2 Type "help", "copyright", "credits" or "license" for more information.
a='device_info' a.lstrip('device')
'_info'
a.lstrip('device_')
'nfo'
On one hand, this is the "development of python itself" list; this issue was more aimed to the general python list, of you was sure that this is a real bug, to the issue tracker.
On the other hand, this is not a bug! If you pass a parameter to lstrip it will (quoted from its help) "remove characters in chars instead.", so the moment you pass "device_", it removes all those characers from the left... note that the 'i' is removed twice.
Regards,
* lou xiao lox.xiao@gmail.com [2015-03-11 01:27:21 +0800]:
I find a bug in str.lstrip, when i call str.lstrip, i get this result.
You're misunderstanding how str.strip works. It takes a set of characters and removes them all from the beginning:
>>> "abababcd".lstrip('ab') >>> 'cd'
Florian
lou xiao writes:
I find a bug in str.lstrip, when i call str.lstrip, i get this result.
a.lstrip('device_')
'nfo'
Try
a.lstrip('_ecived')
You'll see that you get the same result. I suspect that you misunderstand the meaning of the argument, which is not a sequence of characters, but a *set* of characters.
participants (5)
-
Chris Angelico -
Facundo Batista -
Florian Bruhin -
lou xiao -
Stephen J. Turnbull