code: def _parse_packages(self, value):
          
          find_directives = ['find:', 'find_namespace:']
          trimmed_value = value.strip()
  
          if trimmed_value not in find_directives:
              return self._parse_list(value)
  
          findns = trimmed_value == find_directives[1]
          if findns and not PY3:
              raise DistutilsOptionError(
                  'find_namespace: directive is unsupported on Python < 3.3')
  
          # Read function arguments from a dedicated section.
          find_kwargs = self.parse_section_packages__find(
              self.sections.get('packages.find', {}))
  
          if findns:
              from setuptools import find_namespace_packages as find_packages
          else:
              from setuptools import find_packages
  
          return find_packages(**find_kwargs)
docs: Parses `packages` option value.
  
          :param value:
          :rtype: list