python3中自定义wsgi函数，make_server函数报错问题

 

  

   #coding:utf-8from wsgiref.simple_server import make_serverdef RunServer(environ, start_response):    start_response('200 OK', [('Content-Type', 'text/html')])    return '<h1>Hello, web!</h1>'if __name__ == '__main__':    httpd = make_server('localhost', 8000, RunServer)    print ("Serving HTTP on port 8000...")    httpd.serve_forever()这段代码在python2.7中可以运行，到python3.4中运行，就开始报错，报错内容如下：

   Serving HTTP on port 8000...127.0.0.1 - - [12/Apr/2016 16:44:17] "GET / HTTP/1.1" 200 0Traceback (most recent call last):File "C:\Python34\lib\wsgiref\handlers.py", line 138, in runself.finish_response()File "C:\Python34\lib\wsgiref\handlers.py", line 181, in finish_responseself.write(data)File "C:\Python34\lib\wsgiref\handlers.py", line 267, in write"write() argument must be a bytes instance"AssertionError: write() argument must be a bytes instance127.0.0.1 - - [12/Apr/2016 16:44:17] "GET / HTTP/1.1" 500 59Traceback (most recent call last):File "C:\Python34\lib\wsgiref\handlers.py", line 138, in runself.finish_response()File "C:\Python34\lib\wsgiref\handlers.py", line 181, in finish_responseself.write(data)File "C:\Python34\lib\wsgiref\handlers.py", line 267, in write"write() argument must be a bytes instance"AssertionError: write() argument must be a bytes instance

   During handling of the above exception, another exception occurred:

   Traceback (most recent call last):File "C:\Python34\lib\wsgiref\handlers.py", line 141, in runself.handle_error()File "C:\Python34\lib\wsgiref\handlers.py", line 369, in handle_errorself.finish_response()File "C:\Python34\lib\wsgiref\handlers.py", line 181, in finish_responseself.write(data)File "C:\Python34\lib\wsgiref\handlers.py", line 275, in writeself.send_headers()File "C:\Python34\lib\wsgiref\handlers.py", line 332, in send_headersif not self.origin_server or self.client_is_modern():File "C:\Python34\lib\wsgiref\handlers.py", line 345, in client_is_modernreturn self.environ['SERVER_PROTOCOL'].upper() != 'HTTP/0.9'TypeError: 'NoneType' object is not subscriptable

   During handling of the above exception, another exception occurred:

   Traceback (most recent call last):----------------------------------------Exception happened during processing of request from ('127.0.0.1', 60566)File "C:\Python34\lib\socketserver.py", line 305, in _handle_request_noblockself.process_request(request, client_address)File "C:\Python34\lib\socketserver.py", line 331, in process_requestself.finish_request(request, client_address)File "C:\Python34\lib\socketserver.py", line 344, in finish_requestself.RequestHandlerClass(request, client_address, self)File "C:\Python34\lib\socketserver.py", line 673, in __init__self.handle()File "C:\Python34\lib\wsgiref\simple_server.py", line 133, in handlehandler.run(self.server.get_app())File "C:\Python34\lib\wsgiref\handlers.py", line 144, in runself.close()File "C:\Python34\lib\wsgiref\simple_server.py", line 35, in closeself.status.split(' ',1)[0], self.bytes_sentAttributeError: 'NoneType' object has no attribute 'split'--------------------------------------------------------------------------------Exception happened during processing of request from ('127.0.0.1', 60568)----------------------------------------127.0.0.1 - - [12/Apr/2016 16:44:18] "GET / HTTP/1.1" 200 0Traceback (most recent call last):File "C:\Python34\lib\wsgiref\handlers.py", line 138, in runself.finish_response()File "C:\Python34\lib\wsgiref\handlers.py", line 181, in finish_responseself.write(data)File "C:\Python34\lib\wsgiref\handlers.py", line 267, in write"write() argument must be a bytes instance"AssertionError: write() argument must be a bytes instance127.0.0.1 - - [12/Apr/2016 16:44:18] "GET / HTTP/1.1" 500 59Traceback (most recent call last):File "C:\Python34\lib\wsgiref\handlers.py", line 138, in runself.finish_response()File "C:\Python34\lib\wsgiref\handlers.py", line 181, in finish_responseself.write(data)File "C:\Python34\lib\wsgiref\handlers.py", line 267, in write"write() argument must be a bytes instance"AssertionError: write() argument must be a bytes instance

   During handling of the above exception, another exception occurred:

   Traceback (most recent call last):File "C:\Python34\lib\wsgiref\handlers.py", line 141, in runself.handle_error()File "C:\Python34\lib\wsgiref\handlers.py", line 369, in handle_errorself.finish_response()File "C:\Python34\lib\wsgiref\handlers.py", line 181, in finish_responseself.write(data)File "C:\Python34\lib\wsgiref\handlers.py", line 275, in writeself.send_headers()File "C:\Python34\lib\wsgiref\handlers.py", line 332, in send_headersif not self.origin_server or self.client_is_modern():File "C:\Python34\lib\wsgiref\handlers.py", line 345, in client_is_modernreturn self.environ['SERVER_PROTOCOL'].upper() != 'HTTP/0.9'TypeError: 'NoneType' object is not subscriptable

   During handling of the above exception, another exception occurred:

   Traceback (most recent call last):File "C:\Python34\lib\socketserver.py", line 305, in _handle_request_noblockself.process_request(request, client_address)File "C:\Python34\lib\socketserver.py", line 331, in process_requestself.finish_request(request, client_address)File "C:\Python34\lib\socketserver.py", line 344, in finish_requestself.RequestHandlerClass(request, client_address, self)File "C:\Python34\lib\socketserver.py", line 673, in __init__self.handle()File "C:\Python34\lib\wsgiref\simple_server.py", line 133, in handlehandler.run(self.server.get_app())File "C:\Python34\lib\wsgiref\handlers.py", line 144, in runself.close()File "C:\Python34\lib\wsgiref\simple_server.py", line 35, in closeself.status.split(' ',1)[0], self.bytes_sentAttributeError: 'NoneType' object has no attribute 'split'

   猛地一看，这么多报错，一下就蒙圈了，各种google百度，各种查，google到时能查到一些，

   但是英文不好，也看不太明白，百度查到的都是垃圾，根本就没用，最后硬着头皮，一点一点看源码。

   首先，根据第一行的提示：

   File "C:\Python34\lib\wsgiref\handlers.py", line 138, in runself.finish_response()

   我这里用的编辑器是pycharm，找到handlers.py文件的138行，按住ctrl点击文件中的finish_response()方法，

   就找到self.finish_response()定义的位置了。根据第二条提示：

   File "C:\Python34\lib\wsgiref\handlers.py", line 181, in finish_responseself.write(data)

   发现是write方法出现错误，再按住ctrl点击write方法，找到定义write方法的位置，发现第一行就定义了一条报错：

    

   assert type(data) is bytes, \    "write() argument must be a bytes instance"对照上面的报错信息，发现可能是变量data的类型，不是bytes，所以在handlers.py181行代码self.write(data)上面加一句：data=data.encode(),再次刷新程序，发现所有报错居然都没了，程序正常运行。