Update I Best Practices.py

Author: ortizfram

Writing Functions in Python/I Best Practices.py

@@ -177,3 +177,25 @@ def median(values):
 
  **************************************************************************************************************************************************************"""
 ## Mutable or immutable?
+
+"""----What do you expect the values of d and s to be after the function is called?"""
+
+        def store_lower(_dict, _string):
+         """Add a mapping between `_string` and a lowercased version of `_string` to `_dict`
+
+         Args:
+            _dict (dict): The dictionary to update.
+            _string (str): The string to add.
+          """
+          orig_string = _string
+          _string = _string.lower()
+          _dict[orig_string] = _string
+
+        d = {}
+        s = 'Hello'
+
+        store_lower(d, s)
+        
+        # d = {'Hello': 'hello'}, s = 'Hello'
+        """!!!
+        Dictionaries are mutable objects in Python, so the function can directly change it"""