python move a file to a new folder after the file had been processed

Question

my current code does:

1. open .dat file, split them into smaller .dat files by group

newpath = r'C:\Users\DELL\Desktop\python split\462888'
if not os.path.exists(newpath):
    os.makedirs(newpath)

with open('462888//462888.dat', 'a', encoding='utf-8') as outfile:
    for filename in path.glob(f"*{extension}"):
        with open(filename, encoding='utf-8') as infile:
            for line in infile:
                if '4628 88' in line:
                    outfile.write(line)

what i want to do:

how do i move the opened .dat files into a new folder after it finished processing into smaller .dat files to avoid duplication.