Write a basic keymap sanity checker utility

upy-unix-stubs/machine/__init__.py

@@ -0,0 +1,18 @@
+class Anything:
+    '''
+    A stub class which will repr as a provided name
+    '''
+    def __init__(self, name):
+        self.name = name
+
+    def __repr__(self):
+        return 'Anything<{}>'.format(self.name)
+
+
+class Passthrough:
+    def __getattr__(self, attr):
+        return Anything(attr)
+
+
+class Pin:
+    board = Passthrough()