feat(example): iterator

Author: ashegde

codes/session_2/iterators.py

@@ -0,0 +1,23 @@
+# Open terminal > python3 iterators.py
+# Start typing below commands and see the output
+
+for element in [1, 2, 3]:
+  print(element)
+
+for element in (1, 2, 3):
+  print(element)
+
+for key in { 'one': 1, 'two': 2, 'three': 3}:
+  print(key)
+
+for char in '123':
+  print(char)
+
+print('\n\n')
+
+s = 'XYZ'
+it = iter(s)
+print(next(it))
+print(next(it))
+print(next(it))
+print(next(it)) # StopIteration Exception