old_contents: import sys
  
  
  class TypeAheadSearch(object):
      """Class encapsulating the action of the typeahead search."""
  
      def __init__(self):
          # Keep a record of all commands processed.
          self.commands = []
  
      def main(self):
          """Main search loop."""
          # Get the number of expected commands.
          self.num_commands = self.get_num_commands()
  
          # Loop through individual commands.
          for i in range(self.num_commands):
              pass
  
      def get_num_commands(self):
          """Read the number of expected commands from stdin."""
  
      def parse_command(self, command):
          """Parse and validate individual commands."""
  
  
  if __name__ == '__main__':
      search = TypeAheadSearch()
      search.main()
  
new_contents: import sys
  
  
  class TypeAheadSearch(object):
      """Class encapsulating the action of the typeahead search."""
  
      def __init__(self):
          # Keep a record of all commands processed.
          self.commands = []
  
      def main(self):
          """Main search loop."""
          # Get the number of expected commands.
          self.num_commands = self.get_num_commands()
  
          # Loop through individual commands.
          for i in range(self.num_commands):
              command = sys.stdin.readline().strip()
              if not command:
                  raise ValueError
  
      def get_num_commands(self):
          """Read the number of expected commands from stdin."""
          try:
              num_commands = int(sys.stdin.readline().strip())
          except ValueError:
              raise TypeError(
                  "First line of input must be an integer."
              )
  
          if num_commands <= 0 or num_commands > 20:
              raise ValueError(
                  "First line of input must be between 1 and 20, inclusive."
              )
  
      def parse_command(self, command):
          """Parse and validate individual commands."""
  
  
  if __name__ == '__main__':
      search = TypeAheadSearch()
      search.main()
  
subject: Implement get_num_commands.