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Im trying the code on this documentation page of Python3 about HTTP Server.

The code posted on the site is:

def run(server_class=HTTPServer, handler_class=BaseHTTPRequestHandler):
    server_address = ('', 8000)
    httpd = server_class(server_address, handler_class)
    httpd.serve_forever()
this code is working. I would to try the ThreadingHTTPServer so, as the documentation says:
  
This class (ThreadingHTTPServer) is identical to HTTPServer but uses threads to handle requests by using the ThreadingMixIn. This is useful to handle web browsers pre-opening sockets, on which HTTPServer would wait indefinitely.
So, I changed the code above to:
def run(server_class=http.server.ThreadingHTTPServer, handler_class=http.server.BaseHTTPRequestHandler$
    PORT = 8000
    server_address = ('', PORT)
    httpd = server_class(server_address, handler_class)
    print("server running on port: ", PORT)
    httpd.serve_forever()
but I get following error:
Traceback (most recent call last):
  File "simple_http_server.py", line 6, in <module>
    def run(server_class=http.server.ThreadingHTTPServer, handler_class=http.server.BaseHTTPRequestHandler):
AttributeError: module 'http.server' has no attribute 'ThreadingHTTPServer'
I would like to add that it is only recently that I use Python, so I may have missed something.
What do you think is the cause of the error? Where am I doing wrong?
  RequestHandlerClass)

  
This class is identical to HTTPServer but uses threads to handle requests by using the ThreadingMixIn. This is useful to handle web
  browsers pre-opening sockets, on which HTTPServer would wait
  indefinitely.
  
New in version 3.7. <-this
It is possible you don't have the newest version.
        
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