init

local-app/python-tools/billing/aws_cost_compare.py

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+#!/bin/env python
+
+import csv
+import argparse
+import sys
+
+__version__ = "1.0.2"
+
+def load_csv_to_dict(filename):
+    data = {}
+    try:
+        with open(filename, mode='r') as f:
+            reader = csv.DictReader(f)
+            for row in reader:
+                service = row['Service']
+                if service == 'GRAND TOTAL':
+                    continue
+                # Extract usage and amortized cost
+                data[service] = {
+                    'usage': float(row['Usage Quantity']),
+                    'cost': float(row['Total (Amortized)'])
+                }
+        return data
+    except Exception as e:
+        print(f"❌ Error reading {filename}: {e}")
+        sys.exit(1)
+
+def compare_costs(file1, file2):
+    old_data = load_csv_to_dict(file1)
+    new_data = load_csv_to_dict(file2)
+
+    all_services = set(old_data.keys()).union(set(new_data.keys()))
+    comparison_rows = []
+    total_cost_change = 0.0
+
+    for svc in all_services:
+        old = old_data.get(svc, {'usage': 0.0, 'cost': 0.0})
+        new = new_data.get(svc, {'usage': 0.0, 'cost': 0.0})
+
+        usage_diff = new['usage'] - old['usage']
+        cost_diff = new['cost'] - old['cost']
+
+        # Exclude Private Offers from the total calculation logic
+        if "Private Offer" not in svc:
+            total_cost_change += cost_diff
+
+        comparison_rows.append({
+            'Service': svc,
+            'Usage Change': usage_diff,
+            'Cost Change': cost_diff
+        })
+
+    # Sort: Largest savings (most negative) at the top, highest increases at the bottom
+    comparison_rows.sort(key=lambda x: x['Cost Change'], reverse=False)
+
+    output_file = "cost_comparison.csv"
+    print(f"--- AWS Cost Comparison v{__version__} ---")
+    print(f"Savings (negative) appear first; increases appear last.")
+    print(f"Note: 'Private Offer' services excluded from grand total calculation.\n")
+
+    with open(output_file, 'w', newline='') as f:
+        writer = csv.writer(f)
+        writer.writerow(['Service', 'Usage Change', 'Cost Change'])
+
+        for row in comparison_rows:
+            writer.writerow([
+                row['Service'], 
+                f"{row['Usage Change']:.2f}", 
+                f"{row['Cost Change']:.2f}"
+            ])
+
+        # Grand Total line
+        writer.writerow(['TOTAL', 'NA', f"{total_cost_change:.2f}"])
+
+    print(f"✅ Comparison saved to {output_file}")
+    print(f"Filtered Net Change: ${total_cost_change:.2f}")
+
+if __name__ == "__main__":
+    parser = argparse.ArgumentParser(description="Compare two AWS Cost CSVs (v1.0.2)")
+    parser.add_argument('old_file', help="Baseline CSV")
+    parser.add_argument('new_file', help="Comparison CSV")
+    parser.add_argument('--version', action='version', version=f'%(prog)s {__version__}')
+    args = parser.parse_args()
+    compare_costs(args.old_file, args.new_file)