enum.py: Restore compatibility with prev version.

Signed-off-by: Ihor Nehrutsa <Ihor.Nehrutsa@gmail.com>

Author: IhorNehrutsa

python-stdlib/enum/enum.py

@@ -139,6 +139,10 @@ def __ne__(self, other):
         return self._v != self._get_v(other)
 
 
+def enum(**kw_args):  # `**kw_args` kept backwards compatible as in the Internet examples
+    return Enum(kw_args)
+
+
 class Enum(dict):
     def __init__(self, arg=None, **kwargs):
         super().__init__()
@@ -214,6 +218,11 @@ def __dir__(self):
         #return list(set(data_keys + class_stuff + parent_attrs))
         return list(set(data_keys + class_stuff))
 
+    def __call__(self, value):
+        if self.is_value(value):
+            return value
+        raise ValueError(_Err + f"{value}")
+
 
 if __name__ == "__main__":
     # --- Usage Examples ---