使用计时器发送客户端数据

Question

所以我有一个简单的客户端-服务器。

它们与命令行参数正确连接，发送和接收数据。

当服务器未启动并运行但客户端执行时：尝试连接，1 秒后显示超时（3 次）消息，然后关闭。

我能达到的最接近的方法就是尝试 3 次。

import sys
from socket import *
# Get the server hostname, port and data length as command line arguments
argv = sys.argv
host = argv[1]
port = argv[2]
count = argv[3]

# Command line argument is a string, change the port and count into integer
port = int(port)
count = int(count)
data = 'X' * count # Initialize data to be sent

# Create UDP client socket. Note the use of SOCK_DGRAM
clientsocket = socket(AF_INET, SOCK_DGRAM)

# Sending data to server
# times out after 1 second (?)
for i in range(3):
        try:
            print("Sending data to " + host + ", " + str(port) + ": " + data)
            clientsocket.sendto(data.encode(),(host, port)) 
            # Receive the server response
            dataEcho, address = clientsocket.recvfrom(count)
            # Display the server response as an output
            print("Receive data from " + address[0] + ", " + str(address[1]) + ": " + dataEcho.decode())
            break
        except:
            print("timed out")
        finally:
            #Close the client socket
            clientsocket.close()

如何添加计时器？只需在每次尝试之间增加 1 秒，而不是我的编码方式。

Answer 1

如果您只想让程序休眠 x 秒，您可以 import time，然后在您的 clientsocket.close() 行之后添加 time.sleep(num_of_seconds_to_sleep)。