Tweak some examples.

* Return bytes in Python 3
* Activate wsgiref.validate.validator
* Remove unused imports

examples/alt_spec.py

@@ -13,7 +13,7 @@
 
 def load(arg):
     def app(environ, start_response):
-        data = 'Hello, %s!\n' % arg
+        data = b'Hello, %s!\n' % arg
         status = '200 OK'
         response_headers = [
             ('Content-type', 'text/plain'),

examples/echo.py

@@ -5,20 +5,15 @@
 #
 # Example code from Eventlet sources
 
-import os
-import pprint
 from wsgiref.validate import validator
-import sys
 
 from gunicorn import __version__
-#@validator
+
+
+@validator
 def app(environ, start_response):
     """Simplest possible application object"""
 
-    errors = environ['wsgi.errors']
-#    pprint.pprint(('ENVIRON', environ), stream=errors)
-
-    print(environ)
     if environ['REQUEST_METHOD'].upper() != 'POST':
         data = b'Hello, World!\n'
     else:

examples/multiapp.py

@@ -16,7 +16,7 @@
 
 try:
     from routes import Mapper
-except:
+except ImportError:
     print("This example requires Routes to be installed")
 
 # Obviously you'd import your app callables

examples/sendfile.py

@@ -8,7 +8,8 @@
 import os
 from wsgiref.validate import validator
 
-#@validator
+
+@validator
 def app(environ, start_response):
     """Simplest possible application object"""
     status = '200 OK'

examples/test.py

@@ -5,19 +5,15 @@
 #
 # Example code from Eventlet sources
 
-import os
-import pprint
 from wsgiref.validate import validator
-import sys
 
 from gunicorn import __version__
-#@validator
+
+
+@validator
 def app(environ, start_response):
     """Simplest possible application object"""
 
-    errors = environ['wsgi.errors']
-#    pprint.pprint(('ENVIRON', environ), stream=errors)
-
     data = b'Hello, World!\n'
     status = '200 OK'