Question

Question 12 (20 points) Write a function named inverse that takes a single parameter, a dictionary. In this key is a student, represented by a string. The value of each key is a list of courses, each represented by a string, in which the student is enrolled. dictionary each The function inverse should compute and return a dictionary in which each key is a course and the associated value is a list of students enrolled in that course For example, the following would be correct input and output. >>> student-courses {'Elise':[],' Nelson, :['cs100','MATH = print(inverse(student courses) ) 'cs100: ['Nelsontin' "MATH111': ['NelsonJ) Question 13 (20 points) Write a function named fileStats. The function fileStats takes two parameters 1. inFile, a string that is the name of an input file 2. outFile, a string that is the name of an output file The function fileStats should read and analyze each line of the input file and write two statistics, separated by a space, about the line to a corresponding line of the output file. The two statistics for each line are 1. the number of words 2. the number of digits (digits are the characters in positive integers: 0, 1,2..) For example, if the file monthStats.txt contains the following lines February has 28 days or 29 in a leap year January and March have 31 days April has 30 days Then the function call filestats ('monthStats.txt', 'monthStatsout.txt') should produce an output file monthStatsOut.txt with the following content 104 6 2 4 2

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Answer 1

student_courses = {'Elise' : [],
'Nelson' : ['CS100','MATH111'],
'Justin' : ['CS100']}
print(student_courses)
print()

saved Python 3.6.1 (default, Dec 2015, 13:05:11) [GCC 4.8.2] on linux shareは run main.py ##inverse function declaration ##takes a dictionary as input inputed data ('Elise' [, 'Nelson' ['CS100, "MATH111' Jstin' 'cs100'1 3耕return another dictionary as output 4 # reverses the key value pairs output 5 def inverse(student_courses_dict): ##creates a new dictionary 'CS100' 'Nelson' Justin' ], MATH1ll': ['Nelson'1) 6 7 courses_student- ##lop through all dictionary items for student, course in student_courses_dict.items): 10 ##loop through all courses present in one key value pair for c in course: 12 13 14 15 16 17 #checks if course exists in new dictionary if c not in courses_student: ##if not adds it in new dictionary courses_student [c]-[student] else: ##otherwise adds student name in same key of 18 19 20 21 new dictionary courses_student [c].append(student) ##returns new dictionary return courses student 23 ##main 24 25 student_courses 'Elise' : ], 26 'Nelson': ['CS100', 'MATH111', 27 'Justin':['CS100') 28 29 print ("inputed data") 30 print(student_courses) 31 print() 32 print("output") 33 print(inverse(student_courses)) 34

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