input: Write a function to print a formatted table of grades for a given set of students.
  def print_grade_table(students):
      max_name_length = max(len(student['name']) for student in students)
      line_template = "{{name:<{max_name_length}}}   {{grade}}".format(max_name_length=max_name_length)
      header = line_template.format(name='Name', grade='Grade')
      sep = '-' * len(header)
      print(header)
      print(sep)
      for student in students:
          print(line_template.format(**student))
  
  assert print_grade_table([
      {
      'name': "John",
      'grade': 92
      },
      {
      'name': "Alice",
      'grade': 95
      },
      {
      'name': "Bob",
      'grade': 87
      }
  ]) is None
  assert print_grade_table([]) is None
output: def print_grade_table(students):
      if not students:
          return
      max_name_length = max(len(student['name']) for student in students)
      line_template = "{{name:<{max_name_length}}}   {{grade}}".format(max_name_length=max_name_length)
      header = line_template.format(name='Name', grade='Grade')
      sep = '-' * len(header)
      print(header)
      print(sep)
      for student in students:
          print(line_template.format(**student))