Initial commit

Solutions/6_4/structure.py

@@ -0,0 +1,27 @@
+# structure.py
+
+class Structure:
+    _fields = ()
+
+    def __setattr__(self, name, value):
+        if name.startswith('_') or name in self._fields:
+            super().__setattr__(name, value)
+        else:
+            raise AttributeError('No attribute %s' % name)
+
+    def __repr__(self):
+        return '%s(%s)' % (type(self).__name__,
+                           ', '.join(repr(getattr(self, name)) for name in self._fields))
+
+    @classmethod
+    def create_init(cls):
+        '''
+        Create an __init__ method from _fields
+        '''
+        args = ','.join(cls._fields)
+        code = f'def __init__(self, {args}):\n'
+        for name in cls._fields:
+            code += f'    self.{name} = {name}\n'
+        locs = { }
+        exec(code, locs)
+        cls.__init__ = locs['__init__']