code: def check(projects):
      
      log = logging.getLogger('ciu')
      log.info('{0} top-level projects to check'.format(len(projects)))
      print('Finding and checking dependencies ...')
      blockers = dependencies.blockers(projects)
  
      print('')
      for line in message(blockers):
          print(line)
  
      print('')
      for line in pprint_blockers(blockers):
          print(' ', line)
  
      return len(blockers) == 0
docs: Check the specified projects for Python 3 compatibility.