Behavorial pattern => Iterator

rezamobaraki · rezamobaraki · commit ae010ec9ab1e · 2021-03-28T15:11:21.000+04:30
diff --git a/iterator.py b/iterator.py
@@ -0,0 +1,41 @@
+"""
+    Behavioral pattern:
+        Iterator => 1.Iterable 2.Iteration
+
+    Requirements that should know:
+        __iter__ , __next__
+"""
+
+
+class Iteration:
+    def __init__(self, value):
+        self.value = value
+
+    def __next__(self):
+        if self.value == 0:
+            raise StopIteration('End of sequence')
+        for item in range(0, self.value):
+            value = self.value
+            self.value -= 1
+            return value
+
+
+class Iterable:
+    def __init__(self, value):
+        self.value = value
+
+    def __iter__(self):
+        return Iteration(self.value)
+
+
+if __name__ == '__main__':
+    f1 = Iterable(5)
+    f2 = iter(f1)
+
+    print(next(f2))
+    print(next(f2))
+    print(next(f2))
+    print(next(f2))
+    print(next(f2))
+    """we add raise error that don't show later than zero """
+    print(next(f2))
