Fix example commands

example_cmd.py

@@ -4,17 +4,17 @@ from commands import BaseCommand, register_cmd
 class example_cmd(BaseCommand):
 
     def __call__(self, *args, **kwargs):
-        def input_generator():
-            yield 'example'
-            yield 'command'
-        return input_generator
+        def output_generator():
+            yield b'example'
+            yield b'command'
+        return output_generator()
 
 
 @register_cmd
 class echo(BaseCommand):
 
     def __call__(self, *args, **kwargs):
-        def input_generator():
+        def output_generator():
             for line in self.input_cmd():
                 yield line
-        return input_generator
+        return output_generator()