text: def main():
      # Let's create a mapping of student name to GPA
      student_gpa = {"john": 3.5,
                     "jane": 4.0,
                     "bob": 2.8,
                     "mary": 3.2}
  
      # There are four students
      assert len(student_gpa) == 4
  
      # Each student has a name key and a GPA value
      assert len(student_gpa.keys()) == len(student_gpa.values())
  
      # You can get the names in isolation
      for student in student_gpa.keys():
          assert len(student) > 2
  
      # You can get the GPAs in isolation
      for gpa in student_gpa.values():
          assert gpa > 2.0
  
      # You can get the GPA for a specific student
      assert student_gpa["john"] == 3.5
  
      # You can access the student and GPA simultaneously
      for student, gpa in student_gpa.items():
          print(f"Student {student} has a {gpa} GPA")
  
  
  if __name__ == "__main__":
      main()
  