Question

我有这个开源代码，用于回显对Web套接字请求的响应：

_GOODBYE_MESSAGE = 'Goodbye'


def web_socket_do_extra_handshake(request):
    pass  # Always accept.


def web_socket_transfer_data(request):
while True:
    line = request.ws_stream.receive_message()
    if line == "hello":
        request.ws_stream.send_message("hello was sent")
    if line == "bye":
        request.ws_stream.send_message("bye was sent")
    if line is None:
        return
    #request.ws_stream.send_message(line)

    if line == _GOODBYE_MESSAGE:
        return

现在问题是我想修改它（transfer_data方法），以便在while循环中让它说它检查字符串行是否等于某些文本，它应该返回其他东西给客户端，如果行等于其他东西它应该返回不同的字符串。我已经尝试了很多，但它似乎没有用，我知道这是非常基本的，但有人可以帮助我我想要做的另一件事是能够将响应延迟添加到5秒，但导入时间不起作用。我收到错误，请帮忙。

Answer 1

对于你的第一个问题，你可以说

if line == "whatever":
   # do stuff here, return, whatever...
   request.ws_stream.send_message(line)
else:
   # do something else....

睡觉，你想要

 import time
 time.sleep(seconds)

如果“导入时间”行失败，则表示您的python解释器配置存在问题。

Answer 2

对于控制逻辑，请查看Python documentation（链接到2.7）。

请注意，您可以将if结构修改为以下内容：

def web_socket_transfer_data(request):
    while True: # This was at the wrong indent - check it was a copy-paste issue
        line = request.ws_stream.receive_message()

        if line is "hello":
            request.ws_stream.send_message("hello was sent")
        elif line is "bye": # elif is the Pythonic form of else if
            request.ws_stream.send_message("bye was sent")
        elif line is _GOODBYE_MESSAGE or line is None:
            break # This exits the while loop and by extension the method

        time.sleep(5)

至于time.sleep()的问题，您需要确保在文件开头import time。如果这不起作用，您可能想要检查是否可以通过IDLE直接导入它。也就是说，运行IDLE并输入import time。如果失败，请发布它返回的错误。

Python新手，帮助循环

2 个答案: