code: def run(self, error_on_warning=False, region=None, accounts=[]):
          
          all_warnings = []
          all_criticals = []
          if len(accounts) == 0:
              # if no accounts specified, run all of them
              accounts = self._conf.list_account_ids
          for acct_id in accounts:
              acct_conf = self._conf.get_account_config(acct_id)
              if region is None:
                  regions = list(acct_conf['regions'].keys())
              elif region in acct_conf['regions']:
                  regions = [region]
              else:
                  print('\nAccount %s is not configured for region %s' % (
                      acct_id, region
                  ))
                  regions = []
              for rname in regions:
                  print('\n%s (%s) %s' % (acct_id, acct_conf['name'], rname))
                  warnings, criticals = self.check_limits(
                      acct_id, rname, role_name=acct_conf['role_name'],
                      limit_overrides=acct_conf[
                          'regions'][rname]['limit_overrides'],
                      threshold_overrides=acct_conf[
                          'regions'][rname]['threshold_overrides'],
                  )
                  # output
                  for w in warnings:
                      print("\tWARNING: %s" % w)
                      all_warnings.append(w)
                  for c in criticals:
                      print("\tCRITICAL: %s" % c)
                      all_criticals.append(c)
                  if len(warnings) == 0 and len(criticals) == 0:
                      print("\tNo problems found.")
  
          # summary
          if len(all_warnings) > 0 or len(all_criticals) > 0:
              print(
                  "\n{c} limit(s) above CRITICAL threshold; {w} limit(s) above "
                  "WARNING threshold".format(
                      c=len(all_criticals), w=len(all_warnings)
                  )
              )
          else:
              print("All limits are within thresholds.")
          if (
              (len(all_warnings) > 0 and error_on_warning) or
              len(all_criticals) > 0
          ):
              print('PROBLEMS FOUND. See above output for details.')
              raise SystemExit(1)
docs: Main entry point.