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➜ ~