How to order a python list of "string" numbers by its value

Question

I have this list of files:

1.jpg, 2.jpg, ..., 10.jpg, ...

If I do a python os.listdir(".") i have all files listed but in alphabetical order like this:

[1.jpg, 10.jpg, 11.jpg, ..., 2.jpg, 20.jpg....]

But I want them ordered by its numerical value

[1.jpg, 2.jpg ,...10 ,11 ,12... ]

How do I reorder the list to have this done?

tx

see also http://stackoverflow.com/questions/4836710/does-python-have-a-built-in-function-for-string-natural-sort, http://stackoverflow.com/questions/2545532/python-analog-of-natsort-function-sort-a-list-using-a-natural-order-algorithm, http://stackoverflow.com/questions/11150239/python-natural-sorting, http://stackoverflow.com/questions/6849047/naturally-sort-a-list-of-alpha-numeric-tuples-by-the-tuples-first-element-in-py and 1999+ similar questions. — georg, Oct 30 '12 at 19:29

score 6 · Accepted Answer · answered Oct 30 '12 at 18:25

6

In [51]: lis=["1.jpg","10.jpg","11.jpg","2.jpg","20.jpg"]

In [52]: sorted(lis,key=lambda x:int(x.split(".")[0]))
Out[52]: ['1.jpg', '2.jpg', '10.jpg', '11.jpg', '20.jpg']

answered Oct 30 '12 at 18:25

Ashwini Chaudhary

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I think you might as well just copy paste from the other answer :) – Burhan Khalid Oct 30 '12 at 18:27
@BurhanKhalid yes the time difference between both answers is hardly 1 min. :) – Ashwini Chaudhary Oct 30 '12 at 18:34
@butelo glad that helped. you can accept the answer if it worked for you. – Ashwini Chaudhary Oct 30 '12 at 18:36
of course, the system forces me to wait some minutes. I'll accept your answer ASAP – butelo Oct 30 '12 at 18:37

How to order a python list of "string" numbers by its value

1 Answers1