Blacked and isorted the python files

Prettied and eslinted the typescript/html files

bookie/src/app/product-sale-report/product-sale-report-datasource.ts

@@ -1,10 +1,9 @@
 import { DataSource } from '@angular/cdk/collections';
 import { Observable, of as observableOf } from 'rxjs';
-import { ProductSaleReportItem } from './product-sale-report';
 
+import { ProductSaleReportItem } from './product-sale-report-item';
 
 export class ProductSaleReportDataSource extends DataSource<ProductSaleReportItem> {
-
   constructor(public data: ProductSaleReportItem[]) {
     super();
   }
@@ -13,6 +12,5 @@ export class ProductSaleReportDataSource extends DataSource<ProductSaleReportIte
     return observableOf(this.data);
   }
 
-  disconnect() {
-  }
+  disconnect() {}
 }