code: def _get_requests_session():
      
      global requests_session
      if requests_session is not None:
          return requests_session
      import requests
  
      requests_session = requests.Session()
      adapter = requests.adapters.HTTPAdapter(
          max_retries=environments.PIPENV_MAX_RETRIES
      )
      requests_session.mount("https://pypi.org/pypi", adapter)
      return requests_session
docs: Load requests lazily.