Calculate GPA

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Unit 2 Session 1 (Click for link to problem statements)

U-nderstand

Understand what the interviewer is asking for by using test cases and questions about the problem.

• What should my program do if there are no grades in the report_card?
  • In this case, return a grade of 0.0

P-lan

Plan the solution with appropriate visualizations and pseudocode.

General Idea: Map each grade to a points total, then calculate the GPA (grade point average).

1) Create a reference dictionary that maps letter grades to points 2) If the report card is empty, return 0.0 early (to prevent division by zero) 3) Total points starts at 0 4) For each course in the report card: a) Find the corresponding points for the letter grade b) Add those points to the total 5) Calculate the average using the total points and # of courses 6) Return the GPA

⚠️ Common Mistakes

• Be sure your code prevents accidental division by zero when the report_card is empty!

I-mplement

def calculate_gpa(report_card): # Mapping of letter grades to grade points grade_points = {"A": 4, "B": 3, "C": 2, "D": 1, "F": 0} # Check if the report_card dictionary is empty if not report_card: return 0.0 total_points = 0 # Calculate the total grade points for grade in report_card.values(): points = grade_points[grade] total_points += points # Calculate the GPA gpa = total_points / len(report_card) return gpa