code: def _read_extensions(self, context):
          
          try:
              extensions = context['cookiecutter']['_extensions']
          except KeyError:
              return []
          else:
              return [str(ext) for ext in extensions]
docs: Return list of extensions as str to be passed on to the Jinja2 env.
  
          If context does not contain the relevant info, return an empty
          list instead.