Python plz

You have a list of students' names and their grades (in exams taken in PTSL course) in the form of word-colon- number (i.e. 'Student_name:Grade'). You need to complete the following Python function which will find the sum of all grades of each student and will return a dictionary where the key is the student name and its value is the total sum. For example, if the list is. L'Ahmad.15', Alt:20. 'Sara:16, Ahmad:12", Ali:30] The function will return the following dictionary: [Ahmad':27. 'Ali:50'Sarat:16) def checkstudentsum(std_list)