Delete elements from list based on substring in Python

Question

I have a huge list of strings where a couple of strings only differ in 2 or three characters like this:

ENSH-DFFEV1-5F
ENSH-DFFEV2-5F
ENSH-DFFEV3-5F
FVB.DFFVRV2-4T
FVB.DFFVRV3-4T

What I would like to do is to keep only those elements for which the number after the 'V' is the largest. From the above example I would like to have

ENSH-DFFEV3-5F
FVB.DFFVRV3-4T

Is there a simple way to do this in Python?

SO is not a code writing service. We help with specific code problems. Please read through the help centre. — stevieb
– stevieb, Commented Jun 29, 2017 at 18:46
Are these elements in the certain list? Or they are located in file? — ShellRox
– ShellRox, Commented Jun 29, 2017 at 18:51
also, if they are grouped, are they always increasing the number after V like in your example? — jacoblaw
– jacoblaw, Commented Jun 29, 2017 at 18:55
@jacoblaw Yes, they are always grouped together like this, increasing number after the V — FelB
– FelB, Commented Jun 29, 2017 at 19:33

Ghilas BELHADJ · Accepted Answer · 2017-06-29 18:55:31Z

1

@stevieb is right, but anyway, I did the effort for you.

s = """
ENSH-DFFEV1-5F
ENSH-DFFEV2-5F
ENSH-DFFEV3-5F
FVB.DFFVRV2-4T
FVB.DFFVRV3-4T
""".split()

def custom_filter(s):
    out = []
    current_max = -1
    for r in s:
        v = int(r.rsplit('-', 1)[0][-1]) # <- you should probably edit this line to fit your data structure 
        if v > current_max:
            current_max = v
            out = []
        if v == current_max:
            out += [r]
    return out

for e in custom_filter(s):
    print e

answered Jun 29, 2017 at 18:55

Ghilas BELHADJ

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