input: Write a python function to find the student with the highest grade from a list of dictionaries.
  assert highest_grade_person([{'name': 'Alice', 'grade': 88}, {'name': 'Bob', 'grade': 92}, {'name': 'Charlie', 'grade': 85}]) == {'name': 'Bob', 'grade': 92}
  assert highest_grade_person([{'name': 'David', 'grade': 75}, {'name': 'Eve', 'grade': 83}, {'name': 'Frank', 'grade': 95}]) == {'name': 'Frank', 'grade': 95}
  assert highest_grade_person([{'name': 'Grace', 'grade': 80}, {'name': 'Heidi', 'grade': 79}, {'name': 'Ivan', 'grade': 82}]) == {'name': 'Ivan', 'grade': 82}
output: def highest_grade_person(students):
      return max(students, key=lambda x: x['grade'])