now have a calc_future_totals func that is used to allow html to show the bills as a simple annualised cost per year

bills.py

@@ -329,6 +329,7 @@ def process_bill_data(bd, bt, bf):
                 continue
             add_missing_bills_for_yr( bill_type, bill_info, yr )
         derive_ann_growth( bill_type, bill_info )
+    return bill_info
 
 ################################################################################
 # add_missing_bills_for_yr -- wrapper to call right func based on bill freq
@@ -444,3 +445,19 @@ def derive_ann_growth( bill_type, bill_info ):
         else:
             # failsafe (just in case fill bills failed to add enough bills to average out)
             print( f"{bill_type}: Unable to calculate growth!" )
+
+################################################################################
+# just go through this year to END_YEAR, total any bills for each year up
+# so we can display the annual estimated bills onwards...
+################################################################################
+def calc_future_totals(bill_info, bill_types):
+    total={}
+    now_yr = datetime.date.today().year
+    for bt in bill_types:
+        total[bt['id']]={}
+        for yr in range( now_yr, END_YEAR+1):
+            total[bt['id']][yr]=0
+            if bt['id'] in bill_info and yr in bill_info[bt['id']]['year']:
+                for b in bill_info[bt['id']]['year'][yr]:
+                    total[bt['id']][yr] += b['amount']
+    return total