input: Write a function to implement a basic version control system in Python that keeps track of changes in the code. The function should include methods to commit and restore changes, and the system should write and read from a log file for version tracking. 
  
  class VersionControl:
      def __init__(self, lines):
          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()
  
  assert VersionControl("initial code".split()).commit == True
  assert VersionControl("new code section".split()).restore == True
  assert VersionControl("updated code".split()).commit == True
  assert VersionControl("restored code".split()).restore == False
output: 
  class VersionControl:
      def __init__(self, lines):
          self.lines = lines
          self.mark = 0
   
      def commit(self):
          self.mark += 1
          with open("log_file.txt", "a+") as log_file:
              log_file.write(str(self.mark) + ": " + str(self.lines) + "\n")
   
      def restore(self):
          with open("log_file.txt", "r") as log_file:
              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)[1])
  