#Set the directory where the file is available
os.chdir('C:\\Users\\pedroalejandro.tavar\\Desktop')

#infile is the data and outfile contains the output file name's
infile = "coma_file.txt"
outfile = "tab_file.txt"

with open(infile, "r") as infile1:
    with open(outfile, "w") as outfile1:
        for line in infile1:
            fields = line.strip().split(",")
            outfile1.write("\t".join(fields))
            outfile1.write("\n")