code: def GetBudget(self, client_customer_id, budget_id):
      
      self.client.SetClientCustomerId(client_customer_id)
      selector = {
          'fields': ['BudgetId', 'BudgetName', 'BudgetStatus', 'Amount',
                     'DeliveryMethod', 'BudgetReferenceCount',
                     'IsBudgetExplicitlyShared'],
          'predicates': [
              {
                  'field': 'BudgetId',
                  'operator': 'EQUALS',
                  'values': [budget_id]
              }
          ]
      }
      budgets = self.client.GetService('BudgetService').get(selector)
  
      if int(budgets['totalNumEntries']) > 0:
        return budgets['entries'][0]
      else:
        return None
docs: Return a Budget with the associated budgetId.
  
      Args:
        client_customer_id: str Client Customer Id to which the budget belongs.
        budget_id: str id of the budget we want to examine.
  
      Returns:
        Budget A Budget data object.