#coding:utf-8 from wsgiref.simple_server import make_server def 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 0 Traceback (most recent call last): File "C:\Python34\lib\wsgiref\handlers.py", line 138, in run self.finish_response() File "C:\Python34\lib\wsgiref\handlers.py", line 181, in finish_response self.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 127.0.0.1 - - [12/Apr/2016 16:44:17] "GET / HTTP/1.1" 500 59 Traceback (most recent call last): File "C:\Python34\lib\wsgiref\handlers.py", line 138, in run self.finish_response() File "C:\Python34\lib\wsgiref\handlers.py", line 181, in finish_response self.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 run self.handle_error() File "C:\Python34\lib\wsgiref\handlers.py", line 369, in handle_error self.finish_response() File "C:\Python34\lib\wsgiref\handlers.py", line 181, in finish_response self.write(data) File "C:\Python34\lib\wsgiref\handlers.py", line 275, in write self.send_headers() File "C:\Python34\lib\wsgiref\handlers.py", line 332, in send_headers if not self.origin_server or self.client_is_modern(): File "C:\Python34\lib\wsgiref\handlers.py", line 345, in client_is_modern return 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_noblock self.process_request(request, client_address) File "C:\Python34\lib\socketserver.py", line 331, in process_request self.finish_request(request, client_address) File "C:\Python34\lib\socketserver.py", line 344, in finish_request self.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 handle handler.run(self.server.get_app()) File "C:\Python34\lib\wsgiref\handlers.py", line 144, in run self.close() File "C:\Python34\lib\wsgiref\simple_server.py", line 35, in close self.status.split(' ',1)[0], self.bytes_sent AttributeError: '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 0 Traceback (most recent call last): File "C:\Python34\lib\wsgiref\handlers.py", line 138, in run self.finish_response() File "C:\Python34\lib\wsgiref\handlers.py", line 181, in finish_response self.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 127.0.0.1 - - [12/Apr/2016 16:44:18] "GET / HTTP/1.1" 500 59 Traceback (most recent call last): File "C:\Python34\lib\wsgiref\handlers.py", line 138, in run self.finish_response() File "C:\Python34\lib\wsgiref\handlers.py", line 181, in finish_response self.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 run self.handle_error() File "C:\Python34\lib\wsgiref\handlers.py", line 369, in handle_error self.finish_response() File "C:\Python34\lib\wsgiref\handlers.py", line 181, in finish_response self.write(data) File "C:\Python34\lib\wsgiref\handlers.py", line 275, in write self.send_headers() File "C:\Python34\lib\wsgiref\handlers.py", line 332, in send_headers if not self.origin_server or self.client_is_modern(): File "C:\Python34\lib\wsgiref\handlers.py", line 345, in client_is_modern return 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_noblock self.process_request(request, client_address) File "C:\Python34\lib\socketserver.py", line 331, in process_request self.finish_request(request, client_address) File "C:\Python34\lib\socketserver.py", line 344, in finish_request self.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 handle handler.run(self.server.get_app()) File "C:\Python34\lib\wsgiref\handlers.py", line 144, in run self.close() File "C:\Python34\lib\wsgiref\simple_server.py", line 35, in close self.status.split(' ',1)[0], self.bytes_sent AttributeError: '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 run self.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_response self.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。
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