转载 http://python.jobbole.com/80956/ 有原文https://ains.co/blog/things-which-arent-magic-flask-part-1.html
python简单装饰器
# This is our decorator def simple_decorator(f): # This is the new function we're going to return # This function will be used in place of our original definition def wrapper(): print "Entering Function" f() print "Exited Function" return wrapper @simple_decorator def hello(): print "Hello World" hello()运行上述代码会输出以下结果：
Entering Function Hello World Exited Function
带参数的装饰器
def decorator_factory(enter_message, exit_message): # We're going to return this decorator def simple_decorator(f): def wrapper(): print enter_message f() print exit_message return wrapper return simple_decorator @decorator_factory("Start", "End") def hello(): print "Hello World" hello()u结果 Start Hello World End
j简单实现Flask 路由
class NotFlask(): def __init__(self): self.routes = {} def route(self, route_str): def decorator(f): self.routes[route_str] = f return f return decorator def serve(self, path): view_function = self.routes.get(path) if view_function: return view_function() else: raise ValueError('Route "{}"" has not been registered'.format(path)) app = NotFlask() @app.route("/") def hello(): return "Hello World!" print app.serve("/")u结果 Hello World!
