fix: fixed function page_item_count. from calculating: constant * muliplicator * 2. to: constant * multiplicator + constant. first calculation returned wrong amount of items to return

src/codewars/kata_pagination_helper.py

@@ -30,18 +30,20 @@ class PaginationHelper:
 
         return len(
             self.collection[
-                self.items_per_page * page_index : self.items_per_page * page_index * 2
+                self.items_per_page * page_index : self.items_per_page * page_index
+                + self.items_per_page
             ]
         )
 
     # determines what page an item at the given index is on. Zero based indexes.
     # this method should return -1 for item_index values that are out of range
     def page_index(self, item_index):
-        pass
+        try:
+            self.collection[item_index]
 
+            if item_index < 0:
+                raise IndexError
+        except IndexError:
+            return -1
 
-collection = ["a", "b", "c", "d", "e", "f"]
-helper = PaginationHelper(collection, 4)
-
-print(helper.page_count())
-print(helper.page_item_count(1))
+        return item_index // self.items_per_page