Python find max in list of lists and elements with undefined number of values : I have a big list of list. I am trying to find max and min in it. Previous questions on this consists lists with strings and this question is differen.t

    big_list = [[1,2,3],4,[5,6,0,5,7,8],0,[2,1,4,5],[9,1,-2]]

My code: 

    max =  max(list(map(max,boxs_list)))

Present output: 

    TypeError: 'numpy.float64' object is not iterable


