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 你在代码中的for循环之外做了平均值和求和。 我只是将它们移动到for循环中。 对于每次迭代，总和和平均值都会改变，因此它们必须在for循环中。 
 
print ("To stop entering numbers and calculate average, press CTRL+D")
print ("Enter numbers:")
i = 0 
sum = 0 
average = 0.0 
for line in sys.stdin:
    print (i, "\t", line.strip())
    i = i + 1 
    sum +=  int(line.strip())
    average = sum/i
print("The average of the numbers you entered is", round (average, 1),".")
 
 打印总和，平均值可以在for循环之外完成。 
 这是正确的方法 

You were doing average and sum outside the for loop in your code. I just moved them into the for loop. For every iteration , the sum and average both will change, so they have to be in the for loop.
 
print ("To stop entering numbers and calculate average, press CTRL+D")
print ("Enter numbers:")
i = 0 
sum = 0 
average = 0.0 
for line in sys.stdin:
    print (i, "\t", line.strip())
    i = i + 1 
    sum +=  int(line.strip())
    average = sum/i
print("The average of the numbers you entered is", round (average, 1),".")
 
Printing the sum, average values can be done outside the for loop.
 This is the correct method