Python : What is the purpose of a colon in an if statement?

Question

I have this piece of python code below.

def m(list):
    v = list[0]
    for e in list:
        if v < e:
            v = e
        return v

values = [[3, 4,         


        

Answer 1

Another way to write that code is like this, just for learning purposes:

    def max_nest_list(lst):
        max_numbers = []
        for sub_list in lst:
            max_num = sub_list[0]
            for num in sub_list[1:]:
                if num > max_num:
                     max_num = num
            max_numbers.append(max_num)
        return max_numbers

    values = [[3, 4, 5, 1], [33, 6, 1, 2]]
    for item in max_nest_list(values):
        print(item, end = " ")

    #Output
    5 33

Or even more concise:

    def max_nest_list2(lst):
        return [max(i) for i in lst]

    values = [[3, 4, 5, 1], [33, 6, 1, 2]]
    for item in max_nest_list(values):
        print(item, end = " ")