python 2.7 - How to remove the duplicate lines retaining first occurences -


let's input text file "input_msg.txt" file contains follwing records..

jan 1 02:32:40 hello welcome python world
jan 1 02:32:40 hello welcome python world
mar 31 23:31:55 learn python
mar 31 23:31:55 learn python smart
mar 31 23:31:56 python scripting language
jan 1 00:00:01 hello welcome python world
jan 1 00:00:02 hello welcome python world
mar 31 23:31:55 learn python
mar 31 23:31:56 python scripting language

the expected output file ( let's outputfile.txt ) should contain below records...

jan 1 02:32:40 hello welcome python world
jan 1 02:32:40 hello welcome python world
mar 31 23:31:55 learn python
mar 31 23:31:55 learn python smart
mar 31 23:31:56 python scripting language
jan 1 00:00:01 hello welcome python world
jan 1 00:00:02 hello welcome python world

note: need records (including duplicate) starting "jan 1()" , don't need duplicate records not starting "jan 1()"

i have tried following program duplicate records getting deleted.

def remove_duplicate_lines(inputfile, outputfile):      open(inputfile) fin, open(outputfile, 'w') out:       lines = (line.rstrip() line in fin)       unique_lines = ordereddict.fromkeys( (line line in lines if line) )       out.writelines("\n".join(unique_lines.iterkeys()))  return 0

oputput of program below:

jan 1 02:32:40 hello welcome python world
mar 31 23:31:55 learn python
mar 31 23:31:55 learn python smart
mar 31 23:31:56 python scripting language
jan 1 00:00:01 hello welcome python world

your appreciated!!!

try this.

inputfile = open("in.txt", "r") log = [] line in inputfile:     if line in log , line[0:5] != "jan 1":         pass     else:         log.append(line) inputfile.close()  outfile = open("out.txt", "w")  item in log:     outfile.write(item) outfile.close()

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