[Tutor] improve the code

[lina]

On Wed, Nov 2, 2011 at 12:14 AM, Peter Otten <__peter__ at web.de> wrote:
> lina wrote:
>
>>> sorted(new_dictionary.items())
>>
>> Thanks, it works, but there is still a minor question,
>>
>> can I sort based on the general numerical value?
>>
>> namely not:
>> :
>> :
>> 83ILE 1
>> 84ALA 2
>> 8SER 0
>> 9GLY 0
>> :
>> :
>>
>> rather 8 9 ...83 84,
>>
>> Thanks,
>
> You need a custom key function for that one:
>
>>>> import re
>>>> def gnv(s):
> ...     parts = re.split(r"(\d+)", s)
> ...     parts[1::2] = map(int, parts[1::2])
> ...     return parts
> ...
>>>> items = [("83ILE", 1), ("84ALA", 2), ("8SER", 0), ("9GLY", 0)]
>>>> sorted(items, key=lambda pair: (gnv(pair[0]), pair[1]))
> [('8SER', 0), ('9GLY', 0), ('83ILE', 1), ('84ALA', 2)]


Thanks, I can follow the procedure and get the exact results, but
still don't understand this part

parts = re.split(r'"(\d+)",s)

r"(\d+)", sorry,

>>> items
[('83ILE', 1), ('84ALA', 2), ('8SER', 0), ('9GLY', 0)]


>>> parts = re.split(r"(\d+)",items)
Traceback (most recent call last):
  File "<pyshell#78>", line 1, in <module>
    parts = re.split(r"(\d+)",items)
  File "/usr/lib/python3.2/re.py", line 183, in split
    return _compile(pattern, flags).split(string, maxsplit)
TypeError: expected string or buffer

Thanks,
>
>
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