A python problem, and solution

Write a program that maps a list of words into a list of integers representing the lengths of the corresponding words.


class Solution:

    def len1(self, list1):
        list2=[]
        for item in list1:
            list2.append(len(item))
        return(list2)


kk=Solution()

print(kk.len1(['aaa','erty','aaa','aaaar']))