Implement frozen modules (#4)

pycardium/modules/py/color.py

+import ucollections
+
+_ColorTuple = ucollections.namedtuple("Color", ["red", "green", "blue"])
+
+
+class Color(_ColorTuple):
+    @classmethod
+    def from_hex(cls, color):
+        red = (color & 0xff0000) >> 16
+        green = (color & 0x00ff00) >> 8
+        blue = (color & 0x0000ff)
+        return cls(red, green, blue)
+
+    def __str__(self):
+        # Return the color in hex
+        return "#{:02x}{:02x}{:02x}".format(
+            self.red, self.green, self.blue
+        )
+
+
+Color.BLACK   = Color.from_hex(0x000000)
+Color.WHITE   = Color.from_hex(0xffffff)
+Color.RED     = Color.from_hex(0xff0000)
+Color.GREEN   = Color.from_hex(0x00ff00)
+Color.YELLOW  = Color.from_hex(0xffff00)
+Color.BLUE    = Color.from_hex(0x0000ff)
+Color.MAGENTA = Color.from_hex(0xff00ff)
+Color.CYAN    = Color.from_hex(0x00ffff)
+
+
+# Add the colors and constructors to the module for convenience
+# This allows you to do the following:
+#
+#    import colors
+#
+#    colors.BLACK
+#    colors.from_hex(0xc6c6c6)
+globals().update(
+    {
+        n: getattr(Color, n)
+        for n in dir(Color)
+        if n.startswith("from") or n.isupper()
+    }
+)