Python append a string with if/else?

Question

I want to create list of result string based on if-else result, but currently only a 1-value string can be seen when running the loop.

Example:

for ips in npat:
    ipnet = ips.strip()
    print ("Processing ..... ", ipnet)
    fgen = "grep " +ipnet+ " /mnt/hgfs/IRR/fgen.txt"
    f2pat = re.findall(ipnet,fgen)
    print ("\nCommand: ",fgen)
    os.system(fgen)
    print ("\n NEW NPATH: ",f2pat)

    flist = []
    if ipnet in f2pat:
        flist.append("Grep Found")
        print ("Result ", flist)
    else:
        flist.append("Grep NotFound")
        print ("Result: ",flist)

flist -> ['Grep Found']...Only 1 value is in the list in spite of ther should be multiple values. May I know your ideas?

Thanks.

Have you tried moving flist = [] outside / above your for ips in npat loop? — jedwards
– jedwards, Commented Feb 16, 2019 at 23:29

stormfield · Accepted Answer · 2019-02-17 01:54:41Z

4

it seems that flist = [] gets reintiallized in the loop. Move that variable alone above your for loop. Hence the code becomes :

flist = []
for ips in npat:
    ipnet = ips.strip()
    print ("Processing ..... ", ipnet)
    fgen = "grep " +ipnet+ " /mnt/hgfs/IRR/fgen.txt"
    f2pat = re.findall(ipnet,fgen)
    print ("\nCommand: ",fgen)
    os.system(fgen)
    print ("\n NEW NPATH: ",f2pat)


    if ipnet in f2pat:
        flist.append("Grep Found")
        print ("Result ", flist)
    else:
        flist.append("Grep NotFound")
        print ("Result: ",flist)

Credits to jedwards comment

answered Feb 17, 2019 at 1:54

stormfield

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