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list.py

@@ -0,0 +1,86 @@
+class List():
+    def __init__(self):
+        self.head = None
+
+    def last(self):
+        if self.head == None:
+            return None
+        else:
+            last = self.head
+            while True:
+                if last.next() == None:
+                    return last
+                else:
+                    last = last.next()
+
+    def len(self):
+        len = 1
+        if self.head == None:
+            return 0
+        else:
+            last = self.head
+            while True:
+                if last.next() == None:
+                    return len
+                else:
+                    last = last.next()
+                    len += 1
+
+    def add(self, data):             #=append()
+        if self.head == None:
+            self.head = Knot(data)
+        else:
+            last = self.last()
+            last.add(Knot(data))
+
+    def remove(self, index):
+        knotDel = self.findIndex(index)
+        knotChange = self.findIndex(index - 1)
+
+        knotChange.pointer = knotDel.pointer
+        knotDel = None
+
+    def change(self, index, data):
+        knot = self.findIndex(index)
+        knot.data = data
+
+    def findIndex(self, nr):
+        try:
+            index = self.head
+            for i in range(nr):
+                index = index.next()
+            return index
+        except:
+            print("Index nicht in Liste")
+
+    def printWhole(self):
+        if self.head == None:
+            print(None)
+            return
+        
+        knot = self.head
+
+        while True:
+            if knot.next() == None:
+                print(knot.data)
+                return
+            else:
+                print(knot.data)
+                knot = knot.next()
+
+    def print(self, index):
+        knot = self.findIndex(index)
+        print(knot.data)
+
+
+class Knot():
+    def __init__(self, data):
+        self.data = data
+        self.pointer = None
+
+    def add(self, obj):
+        if self.pointer == None:
+            self.pointer = obj
+
+    def next(self):
+        return self.pointer

start.py

@@ -0,0 +1,15 @@
+from list import List
+
+l = List()
+for i in range(10):
+    l.add(i**2)
+
+l.change(5, "Hallo")
+l.print(5)
+
+l.remove(5)
+l.print(5)
+
+l.printWhole()
+
+print(l.len())