from glob import glob
import mailbox
import email
import os
import time

def main():
    fn = r"test.mailbox"
    start = time.time()
    frm = open(fn, 'r').read(5)
    print("Begins with /%s/" % frm)
    if frm == "From ":
        print("Processing ...")
        f = os.path.abspath(fn)
        mbox = mailbox.mbox(f, email.message_from_file)
        for msg in mbox:
            print(msg["message-id"])
        msg_as_string = msg.as_string()
        print(type(msg_as_string), len(msg_as_string))
        s = open(f, 'rb').read()
        print(type(s), len(s))
    print("Duration", time.time()-start)

if __name__ == "__main__":
    main()