CalStatisticV1.py

#CalStatisticV1.py
#基本统计值计算
#获得技能包1：从控制台获取多个不确定数据的方法
def getNum(): 
	nums = []
	iNumStr = input("请输入数字（回车退出）: ")
	while iNumStr != "":
		nums.append(eval(iNumStr))
		iNumStr =  input("请输入数字（回车退出）: ")
	return nums

def mean(numbers):		#计算平均数
	s = 0.0 
	for num in numbers:
		s = s + num
	return s / len(numbers) #len(numbers)：一组数的总个数
	
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
	sorted(numbers)    #sorted(numbers)： 对列表进行排序
	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)))