print("Type integers, each followed\
 by Enter; or just Enter to finish")
while True:
    line = input("integer: ")
    if line:
        try:
            number = int(line)
        except ValueError as err:
            print(err)
            continue
    else:
        break

print("Type integers, each followed",
      "by Enter; or just Enter to finish")
while True:
    line = raw_input("integer: ")
    if not line:
        break
    try:
        number = int(line)
    except ValueError as err:
        print(err)