Merge pull request 'aufgabe3_codewars' (#4) from aufgabe3_codewars into main

Reviewed-on: #4

Sieht solide aus.

Kleiner Tip zu den Kommentaren: Wenn Du die Kommentare mit """ in die Methoden (Funktionen) selbst rein schreibst, hast Du nachher sogar die Möglichkeit 'gratis' eine API-Dokumentation zu erhalten (z.B. sphinx). Auch wird dieser Text dann angezeigt, wenn Du help auf eine Funktion/Methode aufrufst. Wenn Du in # oberhalb der Funktion/Methode kommentierst, hast Du dise Möglichkeit nicht.

src/codewars/pagination_helper.py

@@ -0,0 +1,43 @@
+# Abgabe - PaginationHelper Aufgabe von Codewars
+# Link dazu: https://www.codewars.com/kata/515bb423de843ea99400000a
+# Leart Ramushi
+
+# TODO: complete this class
+import math
+
+
+class PaginationHelper:
+
+    # The constructor takes in an array of items and an integer indicating
+    # how many items fit within a single page
+    def __init__(self, collection, items_per_page):
+        self.collection = collection
+        self.items_per_page = items_per_page
+
+    # returns the number of items within the entire collection
+    def item_count(self):
+        return len(self.collection)
+
+    # returns the number of pages
+    def page_count(self):
+        return math.ceil(len(self.collection) / self.items_per_page)
+
+    # returns the number of items on the given page. page_index is zero based
+    # this method should return -1 for page_index values that are out of range
+    def page_item_count(self, page_index):
+        if page_index < 0 or page_index >= self.page_count():
+            return -1
+        if page_index == self.page_count() - 1:
+            rest = len(self.collection) % self.items_per_page
+            if rest == 0:
+                return self.items_per_page
+            else:
+                return rest
+        return 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):
+        if item_index < 0 or item_index >= len(self.collection):
+            return -1
+        return item_index // self.items_per_page

src/codewars/vigenere_cipher_helper.py

@@ -0,0 +1,51 @@
+# Abgabe - Vigenère Cipher Helper
+# Link dazu: https://www.codewars.com/kata/52d1bd3694d26f8d6e0000d3
+# Leart Ramushi
+
+
+class VigenereCipher(object):
+    def __init__(self, key, alphabet):
+        self.key = key
+        self.alphabet = alphabet
+        self.alp_len = len(alphabet)
+        pass
+
+    def encode(self, text):
+        result = ""
+        key_pos = 0
+        print(text)
+
+        for pos in range(len(text)):
+            currrent_char = text[pos]
+            if currrent_char in self.alphabet:
+                key_char = self.key[key_pos % len(self.key)]
+                # print(currrent_char, " - ", key_char)
+                text_index = self.alphabet.index(currrent_char)
+                key_index = self.alphabet.index(key_char)
+                # print(text_index, " - ", key_index)
+                update_index = (text_index + key_index) % len(self.alphabet)
+                result += self.alphabet[update_index]
+            else:
+                result += currrent_char
+            key_pos += 1
+        print(result)
+        return result
+
+    def decode(self, text):
+        result = ""
+        key_pos = 0
+
+        for pos in range(len(text)):
+            currrent_char = text[pos]
+            if currrent_char in self.alphabet:
+                key_char = self.key[key_pos % len(self.key)]
+                # print(currrent_char, " - ", key_char)
+                text_index = self.alphabet.index(currrent_char)
+                key_index = self.alphabet.index(key_char)
+                # print(text_index, " - ", key_index)
+                update_index = (text_index - key_index) % len(self.alphabet)
+                result += self.alphabet[update_index]
+            else:
+                result += currrent_char
+            key_pos += 1
+        return result