add focus_weights to documentation

config/config.default.yaml

@@ -18,6 +18,8 @@ remote:
   ssh: ""
   path: ""
 
+focus_weights: false
+
 # docs in https://pypsa-eur.readthedocs.io/en/latest/configuration.html#run
 run:
   name: ""

doc/configtables/toplevel.csv

@@ -10,3 +10,4 @@ private,,,
 remote,,,
 -- ssh,--,,Optionally specify the SSH of a remote cluster to be synchronized.
 -- path,--,,Optionally specify the file path within the remote cluster to be synchronized.
+focus_weights,,,Optionally specify the focus weights for the clustering of countries. For instance: `DE: 0.8` will distribute 80% of all nodes to Germany and 20% to the rest of the countries.

scripts/cluster_network.py

@@ -237,7 +237,7 @@ def distribute_clusters(n, n_clusters, focus_weights=None, solver_name="cbc"):
         n_clusters >= len(N) and n_clusters <= N.sum()
     ), f"Number of clusters must be {len(N)} <= n_clusters <= {N.sum()} for this selection of countries."
 
-    if focus_weights is not None:
+    if isinstance(focus_weights, dict):
         total_focus = sum(list(focus_weights.values()))
 
         assert (