input: 
  from typing import List
  
  class VersionControl:
      """
      Implements a basic version control system in Python that keeps track of changes in code.
      The system allows for committing changes and restoring to a previous version.
  
      >>> vc = VersionControl([1, 2, 3])
      >>> vc.commit()
      >>> vc.lines.append(4)
      >>> vc.commit()
      >>> vc.restore()
      >>> vc.lines
      [1, 2, 3]
      """
      def __init__(self, lines: List):
          self.lines = lines
          self.mark = 0
   
      def commit(self):
          self.mark += 1
          log_file = open("log_file.txt", "a+")
          log_file.write(str(self.mark) + ": " + str(self.lines))
          log_file.close()
   
      def restore(self):
          log_file = open("log_file.txt", "r")
          lines = log_file.readlines()
          to_mark = self.mark-1
   
          self.lines = lines[to_mark]
          log_file.close()
  
output:     
          log_file = open("log_file.txt", "r")
          lines = log_file.readlines()
          to_mark = self.mark-1
          
          if to_mark >= 0 and to_mark < len(lines):
              self.lines = eval(lines[to_mark].split(": ")[1])
          else:
              raise IndexError("No previous version to restore.")
          log_file.close()
  