sum.py

#!/usr/bin/env python3

print("Type integers, each followed by Enter; or just enter 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)