python, split string into array after second character

Question

I'm capturing a file with the following content:

*> <'Char><'Char><'space><'string>*

example: Original File

Fs .file1
 M /home/file2
?? /home/file3
M  /home/file4
 D /home/file5

I'm trying to get each line into a list and get always one array with 2 columns. I tried

line.split(' ')

but it is not working since an empty char might happen on the first or second position of each row.

so, I need to do this split after the second character, meaning the result of the above file will be:

['Fs','.file1']
[' M','./home/file2']
['??','./home/file3']
['M ','./home/file4']
[' D','./home/file5']

It would be also acceptable if the empty character on the firl array index is trimmed

['Fs','.file1']
['M','./home/file2']
['??','./home/file3']
['M ','./home/file4']
['D','./home/file5']

This question is off-topic because SO is not a code writing service — Bhargav Rao
– Bhargav Rao, Commented Jan 25, 2015 at 17:50
@BhargavRao, in fairness it is not overly obvious how to do it — Padraic Cunningham
– Padraic Cunningham, Commented Jan 25, 2015 at 17:58
@BhargavRao They did say they tried split(" ") and showed the input and expected output so I think it is a fair question, I don't think they expected the file part just how to split correctly which would not be that obvious to some people. — Padraic Cunningham
– Padraic Cunningham, Commented Jan 25, 2015 at 18:04

Padraic Cunningham · Accepted Answer · 2015-01-25 19:03:16Z

3

Use rsplit presuming the contents all look like you have in your question:

lines ="""Fs .file1
 M /home/file2
?? /home/file3
M  /home/file4
 D /home/file5"""

for line in lines.splitlines():
    # splitting once on " " starting from the right 
    # side keep all whitespace on the left elements
    print(line.rsplit(" ",1))

['Fs', '.file1']
[' M', '/home/file2']
['??', '/home/file3']
['M ', '/home/file4']
[' D', '/home/file5']

So simply use the following in your own code:

print [line.rstrip().rsplit(" ",1)for line in f]

Or as @jonClements suggests use line.rpartition(' ')[::2] to always make sure we get two elements per list:

print [line.rpartition(' ')[::2] for line in f]

edited Jan 25, 2015 at 19:03

answered Jan 25, 2015 at 17:54

Padraic Cunningham

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1 Comment

Jon Clements Over a year ago

To guarantee that you get two elements after the split (I imagine it's plausible to not have flags), then line.rpartition(' ')[::2] can be used...

Antti Haapala · Accepted Answer · 2015-01-25 18:44:09Z

1

If there are always 3 characters before the filename (fixed width) then do the simple way:

flags, filename = line[:2], line[3:]

There is no need to do fancy instead of the right thing.

answered Jan 25, 2015 at 18:44

Antti Haapala

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