use with to simplify the code

main.py

@@ -4,12 +4,11 @@ from Book import Book
 
 
 # Opening JSON file
-f = open('constructor.json', encoding='utf-8')
+with open('constructor.json', encoding='utf-8') as f:
     data = json.load(f)
-f.close()
-f = open("style.css")
+
+with open('style.css', encoding='utf-8') as f:
     style = f.read()
-f.close()
 
 books = data['books']
 html = ""
@@ -18,13 +17,11 @@ for book_data in books:
     book = Book(book_data["name"], book_data["author"], book_data["description"], book_data["image"], book_data["review"], book_data["release_date"], book_data["reading_date"])
     html += book.to_html()
 
-f = open("cast.html")
+with open('cast.html', encoding='utf-8') as f:
     text = f.read().replace("{{books}}", html).replace("{{style}}", style)
-f.close()
 
 if len(sys.argv) > 1:
-    f = open(sys.argv[1], "w", encoding='utf-8')
+    with open(sys.argv[1], "w", encoding='utf-8') as f:
         f.write(text)
-    f.close()
 else:
     print(text)