Add examples for getattr, setattr and hasattr

Author: gitakb72

23_attr.py

@@ -0,0 +1,19 @@
+class X:
+    def __init__(self, **kwargs):
+        for key, value in kwargs.items():
+            setattr(self, key, value)
+
+    def get(self, key):
+        if hasattr(self, key):
+            return getattr(self, key)
+        else:
+            raise AttributeError(f"No attr: '{key}'")
+
+x = X(first_name="First", last_name="Last")
+
+assert x.get("first_name") == "First"
+assert x.get("last_name") == "Last"
+try:
+    x.get("middle_name")
+except AttributeError:
+    print("All OK!")