Update u2/list_ops.py

u2/list_ops.py

@@ -0,0 +1,14 @@
+def length(l):
+    count = 0
+    for c in range l:
+        count +=1
+    return count
+
+def append(list1, list2):
+    list = []
+    for item in list1:
+        list += [item]
+    for item in list2:
+        list += [item]
+    return list
+