Add files via upload

Sequence.py

@@ -0,0 +1,72 @@
+from array import array
+
+
+class Iterator:
+    def __iter__(self):
+        return self
+
+    def __init__(self, collection, rev, counter):
+        self.collection = collection
+        self.rev = rev
+        self.counter = counter
+
+    def __next__(self):
+        if self.rev:
+            self.counter += 1
+        else:
+            self.counter -= 1
+        if -1 < self.counter < len(self.collection):
+            return self.collection[self.counter]
+        else:
+            raise StopIteration
+
+
+class Sequence:
+    def __init__(self, element_type, *elements):
+        self.lst = array(element_type, elements)
+
+    def __getitem__(self, ind):
+        if isinstance(ind, slice):
+            first_el, *elements = self.lst[ind]
+            return (first_el, *elements)
+        return self.lst[ind]
+
+    def __len__(self):
+        return len(self.lst)
+
+    def __contains__(self, elem):
+        if self.lst.count(elem) == 0:
+            return False
+        else:
+            return True
+
+    def __iter__(self):
+        counter = -1
+        self.it = Iterator(self.lst, True, counter)
+        return self.it
+
+    def __reversed__(self):
+        counter = len(self.lst)
+        self.it = Iterator(self.lst, False, counter)
+        return self.it
+
+    def index(self, elem):
+        return self.lst.index(elem)
+
+    def count(self, elem):
+        return self.lst.count(elem)
+
+
+#x = Sequence('u', 'a', 'b', 'e', 'd', 'e')
+x = Sequence('i', 1, 2, 3, 2, 4)
+print(x[:3])
+print(len(x))
+print(3 in x)
+for i in x:
+    print(i, end=' ')
+print()
+for i in reversed(x):
+    print(i, end=' ')
+print()
+print(x.index(1))
+print(x.count(2))