poython中求列表的最大值、最小值、求和和平均值

1、

>>> a = [20,10,50,40,30]
>>> max = a[0]
>>> for i in a:
    if i > max:
        max = i

        
>>> print(max)
50
>>> min = a[0]
>>> for i in a:
    if i < min:
        min = i

        
>>> print(min)
10
>>> sum = 0
>>> for i in a:
    sum += i

    
>>> print(sum)
150
>>> 
>>> print(sum/len(a))
30.0
del max
del min

2、

>>> a = [20,50,30,10,60,40]
>>> max(a)   ##最大值
60
>>> min(a)  ## 最小值
10
>>> sum(a)   ## 求和
210
>>> sum(a)/len(a)  ## 求平均值
35.0