_: {
  # use mirror for pip install
  xdg.configFile."pip/pip.conf".text = ''
    [global]
    index-url = https://mirror.nju.edu.cn/pypi/web/simple
    format = columns
  '';

  # xdg.configFile."pip/pip.conf".text = ''
  #   [global]
  #   index-url = https://mirror.nju.edu.cn/pypi/web/simple
  #   format = columns
  # '';

  # xdg.configFile."pip/pip.conf".text = ''
  #   [global]
  #   index-url = https://mirrors.bfsu.edu.cn/pypi/web/simple
  # '';
}