Read a Student Grade
Write read_student_grade(student, default_grade). Return the value for the grade key when it exists; otherwise return default_grade.
Examples
[{"name":"Ram","grade":"A"},"Not graded"]"A"
Write read_student_grade(student, default_grade). Return the value for the grade key when it exists; otherwise return default_grade.
[{"name":"Ram","grade":"A"},"Not graded"]"A"