clarify vars

splink/accuracy.py

@@ -151,10 +151,10 @@ def _select_found_by_blocking_rules(linker: "Linker"):
     brs = linker._settings_obj._blocking_rules_to_generate_predictions
 
     if brs:
-        brs = [move_l_r_table_prefix_to_column_suffix(b.blocking_rule_sql) for b in brs]
-        brs = [f"(coalesce({b}, false))" for b in brs]
-        brs = " OR ".join(brs)
-        br_col = f" ({brs}) "
+        br_strings = [move_l_r_table_prefix_to_column_suffix(b.blocking_rule_sql) for b in brs]
+        wrapped_br_strings = [f"(coalesce({b}, false))" for b in br_strings]
+        full_br_string = " OR ".join(wrapped_br_strings)
+        br_col = f" ({full_br_string}) "
     else:
         br_col = " 1=1 "
 

splink/sql_transform.py

@@ -34,7 +34,7 @@ def _remove_table_prefix(node):
     return node
 
 
-def move_l_r_table_prefix_to_column_suffix(blocking_rule):
+def move_l_r_table_prefix_to_column_suffix(blocking_rule) -> str:
     expression_tree = sqlglot.parse_one(blocking_rule, read=None)
     transformed_tree = expression_tree.transform(_add_l_or_r_to_identifier)
     transformed_tree = transformed_tree.transform(_remove_table_prefix)