2. Consider a dictionary called course_enrolment. The dictionary uses strings as its keys In this case the strings are simply the course codes (eg. 'comp1005', math1000', etc) The values of the dictionary are integers that represent the total number of students enrolled in a given class. Write a function called total_enrolment that takes such a dictionary as its single input parameter. The function will iterate over the dictionary and return the total number of students enrolled in all classes