old_contents: import argparse
  from scraper import dept_scraper, section_scraper
  
  VALID_SEMESTERS = [('Spring', 2014)]
  
  parser = argparse.ArgumentParser(description="Scrape the UCB Schedule of Classes.")
  parser.add_argument('type', type=str, help="type of scraping (department or section).")
  parser.add_argument('--semester', help="semester (Fall, Spring, or Summer)")
  parser.add_argument('--year', help='year (integer)')
  
  args = parser.parse_args()
  print "type: {0}, semester: {1}, year: {2}".format(args.type,
                                                     args.semester,
                                                     args.year)
  
  if args.type == 'department':
      dept_scraper.run()
  
  if args.type == 'section':
      semester = args.semester
      year = args.year
      try:
          year = int(year)
      except:
          raise ValueError("Invalid year.")
      if (semester, year) not in VALID_SEMESTERS:
          raise ValueError("Invalid semester/year.")
      section_scraper.run(semester, year)
  
  
new_contents: import argparse, os, shutil
  from scraper import dept_scraper, section_scraper
  
  VALID_SEMESTERS = [('Spring', 2014)]
  
  def backup():
      if os.path.isfile('schedule.db'):
          shutil.copy2('schedule.db', 'schedule-backup.db')
  
  parser = argparse.ArgumentParser(description="Scrape the UCB Schedule of Classes.")
  parser.add_argument('type', type=str, help="type of scraping (department or section).")
  parser.add_argument('--semester', help="semester (Fall, Spring, or Summer)")
  parser.add_argument('--year', help='year (integer)')
  
  args = parser.parse_args()
  print "type: {0}, semester: {1}, year: {2}".format(args.type,
                                                     args.semester,
                                                     args.year)
  
  if args.type == 'department':
      backup()
      dept_scraper.run()
  
  if args.type == 'section':
      semester = args.semester
      year = args.year
      try:
          year = int(year)
      except:
          raise ValueError("Invalid year.")
      if (semester, year) not in VALID_SEMESTERS:
          raise ValueError("Invalid semester/year.")
      backup()
      section_scraper.run(semester, year)
  
  
subject: Add backup function to runscraper.py.