initial commit

billinglayer/python/shapely/_enum.py

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+from enum import IntEnum
+
+
+class ParamEnum(IntEnum):
+    """Wraps IntEnum to provide validation of a requested item.
+
+    Intended for enums used for function parameters.
+
+    Use enum.get_value(item) for this behavior instead of builtin enum[item].
+    """
+
+    @classmethod
+    def get_value(cls, item):
+        """Validate incoming item and raise a ValueError with valid options if not present."""
+        try:
+            return cls[item].value
+        except KeyError:
+            valid_options = {e.name for e in cls}
+            raise ValueError(
+                "'{}' is not a valid option, must be one of '{}'".format(
+                    item, "', '".join(valid_options)
+                )
+            )