code: def syntax_check():
      
      with fab_settings(warn_only=True):
          for file_type in settings.SYNTAX_CHECK:
              needs_to_abort = False
              # because egrep fails with exit code 1, we need to allow this as
              # a successful exit code in our env
              if 1 not in env.ok_ret_codes:
                  env.ok_ret_codes.append(1)
              output = local(
                  'find -name "{}" -print'.format(file_type),
                  capture=True,
              )
              files = output.split()
              for file in files:
                  if any(s in file for s in settings.SYNTAX_CHECK_EXCLUDES):
                      continue
                  result = local('egrep -i -n "{0}" {1}'.format(
                      settings.SYNTAX_CHECK[file_type], file), capture=True)
                  if result:
                      warn(red("Syntax check found in '{0}': {1}".format(
                          file, result)))
                      needs_to_abort = True
              if needs_to_abort:
                  abort(red('There have been errors. Please fix them and run'
                            ' the check again.'))
              else:
                  puts(green('Syntax check found no errors. Very good!'))
docs: Runs flake8 against the codebase.