Kent Johnson wrote:
Actually, its not all that difficult. Instead of removing characters from the list, just replace them with an empty string and return ''.join(string):Jacob S. wrote:
Try writing the code to do what lstrip actually does - its much harder. So the library includes the more difficult function and lets you code the easy ones.
def lstrip(string,chars=' ') string = list(string) t = 0 for x in string: if x in chars: string.remove(t) else: break t = t+1
Okay, so it's not that difficult,
Well, after fixing the obvious syntax error I tried print lstrip('abcd', 'abcd')
and got Traceback (most recent call last): File "D:\Personal\Tutor\LStrip.py", line 11, in ? print lstrip('abcd', 'abcd') File "D:\Personal\Tutor\LStrip.py", line 6, in lstrip string.remove(t) ValueError: list.remove(x): x not in list
so maybe it's not that easy either. Don't forget the unit tests! :-)
Kent
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>>> def lstrip(string,chars=' '):
string = list(string)
i = 0
for x in string:
if x in chars:
string[i] = ''
else:
break
i+=1
return ''.join(string)>>> lstrip('abcd','abcd')
''
>>> 'abcd'.lstrip('abcd')
''
>>> 'go on long log buddy'.lstrip('gonl ')
'buddy'
>>> lstrip('go on long log buddy', 'gonl ')
'buddy'
>>> 'go on long log buddy'.lstrip('gonl')
' on long log buddy'
>>> lstrip('go on long log buddy', 'gonl')
' on long log buddy'So its not a brute force thing so much as a change in how you look at it that makes it difficult.
-- Email: singingxduck AT gmail DOT com AIM: singingxduck Programming Python for the fun of it.
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