Simplify calculate_payments code

openprocurement/tender/esco/npv_calculation.py

@@ -80,16 +80,19 @@ def calculate_payments(
         days_for_discount_rate):
     '''Calculates client payments to a participant'''
 
-    lists = zip(
-        client_cost_reductions,
-        days_with_payments,
-        days_for_discount_rate,
-    )
+    payments = []
+
+    for i, _ in enumerate(client_cost_reductions):
+        payments.append(
+            calculate_payment(
+                yearly_payments_percentage,
+                client_cost_reductions[i],
+                days_with_payments[i],
+                days_for_discount_rate[i],
+            )
+        )
 
-    return [
-        calculate_payment(yearly_payments_percentage, *arg)
-        for arg in lists
-    ]
+    return payments
 
 
 def calculate_discounted_income(coef_discount, income_customer):