python - Evaluating the next line in a For Loop while in the current iteration -

here trying do: trying solve issue has wrapping in text file.

i want open txt file, read line , if line contains want contain, check next line see if not contain in first line. if not, add line first line.

    import re      stuff = open("my file")      line in stuff:         if re.search("from ", line):             first = line             print first             if re.search('from ', handle.next()):                continue             else: first = first + handle.next()          else: continue 

i have looked quite few things , cannot seem find answer. please help!

i try this, invalid triples of "from " , not elegant @ all.

lines = open("file", 'r').readlines() lines2 = open("file2", 'w')      counter_list=[] last_from = 0 counter, line in enumerate(lines):     if "from " in line , counter != last_from +1:        last_from = counter        current_count = counter     if current_count+1 == counter:        if "from " in line:            counter_list.append(current_count+1)  counter, line in enumerate(lines):     if counter in counter_list:         lines2.write(line)     else:         lines2.write(line, '\n') 

than can check lines2 if helped.

you revert order of lines, check in next line not in previous. solve problem in 1 loop.