sum2.py

#!/usr/bin/env python3
# Copyright (c) 2008-11 Qtrac Ltd. All rights reserved.
# This program or module is free software: you can redistribute it and/or
# modify it under the terms of the GNU General Public License as published
# by the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version. It is provided for educational
# purposes and is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.

print("Type integers, each followed by Enter; or ^D or ^Z to finish")

total = 0
count = 0

while True:
    try:
        line = input()
        if line:
            number = int(line)
            total += number
            count += 1
    except ValueError as err:
        print(err)
        continue
    except EOFError:
        break

if count:
    print("count =", count, "total =", total, "mean =", total / count)