code: def sanitize_proxies (self):
          
          if os.name != 'posix':
              return
          if "http" not in self["proxy"]:
              http_proxy = get_gconf_http_proxy() or get_kde_http_proxy()
              if http_proxy:
                  self["proxy"]["http"] = http_proxy
          if "ftp" not in self["proxy"]:
              ftp_proxy = get_gconf_ftp_proxy() or get_kde_ftp_proxy()
              if ftp_proxy:
                  self["proxy"]["ftp"] = ftp_proxy
docs: Try to read additional proxy settings which urllib does not
          support.