1this derivation will be built:2 /nix/store/jja8636kgkglf04q437ngwq39lwyzcz3-python3.9-python-nest-4.2.0.drv3these 2 paths will be fetched (276.1 KiB download, 681.9 KiB unpacked):4 /nix/store/wvg7na5j8dnlzqf5nmx68wadl34b700h-python3.9-python-dateutil-2.8.25 /nix/store/a3h4plp7yxmxzlydp3mnhh15znl4zkby-python3.9-sseclient-py-1.7.2