python求平均数、方差、中位数的例子
CalStatistics.py
def getNum(): #获取用户不定长度的输入
nums = []
iNumStr = input("请输入数字(回车退出):")
while iNumStr != "":
nums.append(eval(iNumStr))
iNumStr = input("请输入数学(回车退出):")
return nums
def mean(numbers): #计算平均值
s = 0.0
for num in numbers:
s = s + num
return s/len(numbers)
def dev(numbers, mean): #计算方差
sdev = 0.0
for num in numbers:
sdev = sdev + (num - mean)**2
return pow(sdev / (len(numbers)-1), 0.5)
def median(numbers): #计算中位数
numbers = sorted(numbers) #sorted(numbers)
size = len(numbers)
if size % 2 == 0:
med = (numbers[size//2 - 1] + numbers[size//2])/2
else:
med = numbers[size//2]
return med
n = getNum()
m = mean(n)
print("平均值:{},方差:{:.2},中位数:{}.".format(m, dev(n,m), median(n)))
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