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Python identifies the file with the highest number as part of the filename

I have files with a number appended at the end, for example:

  file_01.csv
  file_02.csv
  file_03.csv

I'm looking for an easy way to identify the file with the largest number appended to it. Is there a moderately easy way to achieve this? ... I was thinking about importing all the filenames in a folder, extracting the last digits, converting to a number, and finding the maximum number, however this looks moderately difficult as I suppose it is a relatively general task.

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if the filenames are indeed formatted in such a good way, you can simply use max

:

>>> max(['file_01.csv', 'file_02.csv', 'file_03.csv'])
'file_03.csv'

but please note that:



>>> 'file_5.csv' > 'file_23.csv'
True
>>> 'my_file_01' > 'file_123'
True
>>> 'fyle_01' > 'file_42'
True

so you can add some kind of check to your function and / or use glob.glob

:

>>> max(glob.glob('/tmp/file_??'))
'/tmp/file_03'
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source 


import re
x=["file_01.csv","file_02.csv","file_03.csv"]
print max(x,key=lambda x:re.split(r"_|\.",x)[1])


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