如何计算 python 2.7 的平均值

Question

我正在尝试计算用户输入数字并在他决定时停止的平均值。我设法得到了总和，但是我不能将它除掉，因为我需要以某种方式在他停止输入之前得到输入的数量。到目前为止，这是我的代码：

print (" please enter all the numbers you want to calculate the avarage. After you enter all of them press 'f' to finish.")

s = 0

x = raw_input ('please enter the number')

while (num != 'f'):
    x = eval (x)
    s = s + x
    x = raw_input ('please enter the number')

print (' the average is'), s

就像你看到的那样，我设法得到了总和，但是我不知道如何得到输入的数量，然后将总和除以这个得到平均值。任何帮助将不胜感激

Answer 1

您只需要在 while 循环中添加一个计数器：

print (" please enter all the numbers you want to calculate the avarage. After you enter all of them press 'f' to finish.")

s = i = 0         #declare counter: i = 0

x = raw_input ('please enter the number')

while (x != 'f'):
    x = eval (x)
    s = s + x
    i+=1          #increment counter: i=i+1 or i+=1 (these 2 options are equivalent)
    x = raw_input ('please enter the number')

print (' the average is'), s/i    #divide the sum by counter

如何计算 python 2.7 的平均值

How to calculate average / mean on python 2.7

python-2.7

average