leetcode-寻找两个正序数组的中位数

a=[1,2,9]
b=[4,5]


def middle(a,b):
    c=a+b
    c.sort()
    if len(c)%2==1:
        return c[int(len(c)/2)]
    else:
        return 0.5*( c[int(len(c)/2)-1]+ c[int(len(c)/2)])
    
print(middle(a,b))