enum: Add CPython and MicroPython demo.

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

Author: IhorNehrutsa

python-stdlib/enum/CPy/CPy.py

@@ -0,0 +1,76 @@
+from enum import Enum
+
+is_micropython = False
+try:
+    from machine import reset
+    is_micropython = True
+except Exception:
+    pass
+
+
+class Color(Enum):
+    RED = 1
+    GREEN = 2
+    BLUE = 3
+
+if is_micropython:
+    Color()  # Trigger initialization
+
+print("\n--- Basic Lookups ---")
+print(Color.RED)                       # Color.RED
+print(Color.RED.name)                  # RED
+print(Color.RED.value)                 # 1
+print(repr(Color.RED))                 # <Color.RED: 1>
+print(Color.__contains__(1))           # True
+print(Color.__contains__(11))          # False
+print(Color.__contains__(Color.RED))   # True
+print(Color.RED.value == 1)            # True
+print(Color.RED.value + 10)            # 11
+print(Color(1) is Color.RED)           # True
+print()
+
+if is_micropython:
+    print(Color())                         # <enum 'Color'>
+    print(repr(Color()))                   # <enum 'Color'>
+    print(len(Color()))                    # 3
+    print(Color("RED"))                    # Color.RED
+    print(Color("RED") is Color.RED)       # True
+    print(Color.RED == 1)                  # True (like IntEnum)
+    print(list(Color()))                   # ['RED', 'GREEN', 'BLUE']
+    print(list(Color.__members__))         # ['RED', 'GREEN', 'BLUE']
+else:
+    print(Color)                           # <enum 'Color'>
+    print(repr(Color))                     # <enum 'Color'>
+    print(len(Color))                      # 3
+    print(Color["RED"])                    # Color.RED
+    print(Color["RED"] is Color.RED)       # True
+    print(Color.RED == 1)                  # False
+    print(list(Color))                     # [<Color.RED: 1>, <Color.GREEN: 2>, <Color.BLUE: 3>]
+    print(list(Color.__members__))         # ['RED', 'GREEN', 'BLUE']
+
+print("\n--- Immutability Tests ---")
+try:
+    Color.RED.value = 99
+    0 / 0
+except AttributeError:
+    print("Protected: Cannot reassign class attribute")
+
+try:
+    if is_micropython:
+        Color().RED = 99
+    else:
+        Color.RED = 99
+    0 / 0
+except AttributeError:
+    print("Protected: Cannot reassign class attribute")
+
+try:
+    if is_micropython:
+        del Color().RED
+    else:
+        del Color.RED
+    0 / 0
+except AttributeError:
+    print("Protected: Cannot delete class attribute")
+
+assert Color.RED.value == 1