csv - Copying data to another column in Python/Pandas -

i have ip packet csv file i'm trying extract sequence numbers info field separate column has sequence numbers. sequence numbers substring in middle of info string. here raw code.. first create new column fo sequence numbers, check if info field contains seq number, split info field sequence number out. if print after 'seq = j.split...', correct values. how write csv file seq column?

file = pd.read_csv(file.csv)  file['seq'] = none in file['info']:     if 'seq' in i:         split = i.split(' ')         j in split:             if 'seq=' in j:                 seq = j.split('seq=',1)[1]                 file.loc[i,'seq'] = int(seq) 

example csv:

no. time        source      destination protocol    length  info   1   0.000000    sourceip    192.168.0.1 tcp         54      35165 > 80 [syn] seq=0 win=16384 len=0   2   0.000001    sourceip    192.168.0.1 tcp         54      14378 > 80 [syn] seq=0 win=16384 len=0   3   0.000003    sourceip    192.168.0.1 tcp         54      31944 > 80 [syn] seq=0 win=16384 len=0 

desired outcome:

no. time        source      destination protocol    length  info                                   seq   1   0.000000    sourceip    192.168.0.1 tcp         54      35165 > 80 [syn] seq=0 win=16384 len=0 0   2   0.000001    sourceip    192.168.0.1 tcp         54      14378 > 80 [syn] seq=0 win=16384 len=0 0   3   0.000003    sourceip    192.168.0.1 tcp         54      31944 > 80 [syn] seq=0 win=16384 len=0 0 

use str.extract

file['seq'] = file.info.str.extract('seq=(\d+)', expand=false).astype(float)