these 2 derivations will be built:
  /nix/store/0srqxgyjkwm9y2kg56760ndb204z4a8q-python-nest-4.2.0.tar.gz.drv
  /nix/store/l6c62j6lhvjf1xj098h7x9ymgk3j2vvj-python3.9-python-nest-4.2.0.drv
these 2 paths will be fetched (276.1 KiB download, 681.9 KiB unpacked):
  /nix/store/plh004zisgrrr1vbiwlgvhczyg1wb0aq-python3.9-python-dateutil-2.8.2
  /nix/store/09pxfc49r56gdwn6b21pz34bysd92lkh-python3.9-sseclient-py-1.7.2