if else condition issue

[buran]

no need to read the whole file in memory, just iterate over lines

in_file = 'file1.txt'
out_file = 'output.txt'
with open(in_file, "r") as f1, open(out_file, "w+") as f2:
    for line in f1:
        if line.startswith('comb'):
            pass # skip lines that start with 'comb'
        else:
            if line.startswith('result'):
                line = line[6:].lstrip() # remove result and strip whitespace from left-hand side
            f2.write(line)

now, with file2 there will be double blank lines (i.e. that is the blank lines before and after comb part). you will need to fix this if it is a problem. Also note that your blank lines in the example have single space (not actually empty lines).