Parallel file reading in python

I have been trying to read a large file and writing to another file at the same time after processing the data from the input file, the file is pretty huge around 4-8 GB, is there a way to parallelise the process to save the time

The original program is:

with open(infile,"r") as filein:
with open(writefile,"w") as filewrite: 
    with open(errorfile,"w") as fileerror:
        line=filein.readline()
        count=0
        filewrite.write("Time,Request,IP,MAC\n")
        while line:
            count+=1
            line=filein.readline()
            #print "{}: {}".format(count,line.strip()) testing content
            if requestp.search(line):
                filewrite.write(line.strip()[:15]+",")
                filewrite.write(requestp.search(line).group()+",")
                if IP.search(line):
                    filewrite.write(IP.search(line).group())
                filewrite.write(",")
                if MACp.search(line):
                    filewrite.write(MACp.search(line).group())
                filewrite.write("\n")
            else:
                fileerror.write(line)

But this takes too much time to process such a file and I have 100's of such files, I've tried using Ipyparellel to parallilise the code but have not met with success yet, is there a way to do this.