Update app.py

app.py

@@ -686,6 +686,7 @@ def server(input, output, session):
 
         # Define the columns to subtract
         cols_to_subtract = [
+
             ("start_speed", "start_speed_old"),
             ("max_start_speed", "max_start_speed_old"),
             ("ivb", "ivb_old"),
@@ -720,19 +721,44 @@ def server(input, output, session):
         ])
 
 
-
-
-
-
-        percent_cols = ['pitch_percent', 'rhh_percent', 'lhh_percent']
-
+        cols_to_subtract_percent = [
+            ("pitch_percent", "pitch_percent_old"),
+            ("rhh_percent", "rhh_percent_old"),
+            ("lhh_percent", "lhh_percent_old"),
+        ]
+        
+        
         df_merge = df_merge.with_columns([
-            (pl.col(col) * 100)  # Convert to percentage
-            .round(1)            # Round to 1 decimal
-            .map_elements(lambda x: f"{x:.1f}%")  # Format as string with '%'
-            .alias(col + "_formatted")
-            for col in percent_cols
-        ]).sort(['pitcher_id','count'],descending=True)
+            # Step 1: Create _diff columns with the default value (e.g., 80) if old is null
+            pl.when(pl.col(old).is_null())
+            .then(pl.lit(10000))  # If old is null, assign 80 as the default
+            .otherwise(pl.col(new) - pl.col(old))  # Otherwise subtract old from new
+            .alias(new + "_diff")
+            for new, old in cols_to_subtract_percent
+        ])
+        
+        # percent_cols = ['pitch_percent', 'rhh_percent', 'lhh_percent']
+        
+        # Step 2: Format the columns with (value (+diff)) - exclude brackets if diff is 80
+        df_merge = df_merge.with_columns([
+            pl.when(pl.col(new + "_diff").eq(10000))  # If diff is 80, no need to include brackets
+            .then(
+                (pl.col(new)*100).round(1).map_elements(lambda x: f"{x:.1f}%").cast(pl.Utf8) + 
+                "\n(" + 
+                (pl.col(new)*100).round(1)
+                    .map_elements(lambda x: f"{x:+.1f}%") + 
+                ")"
+            )
+            .otherwise(
+                (pl.col(new)*100).round(1).map_elements(lambda x: f"{x:.1f}%").cast(pl.Utf8) + 
+                "\n(" + 
+                (pl.col(new + "_diff")*100).round(1)
+                    .map_elements(lambda x: f"{x:+.1f}%") + 
+                ")"
+            ).alias(new + "_formatted")
+            for new, _ in cols_to_subtract_percent
+        ])
+
 
 
         columns = [