Python：Netcat函数不起作用

Question

When I use this command on Linux, it works:

echo "test.bash.stats 44 1459116000" | nc myhostname.com 2003

But now, I try to implement this command in a Python script.

Method 1: Use os.system("")

# this works
os.system("echo 'test.bash.stats 14 1459116000' | nc myhostname.com 2003")

#It does not work because there are a problem with quote
data['time_timestamp'] = 1459116000
os.system("echo 'test.bash.stats 14 "data['time_timestamp']"' | nc myhostname.com 2003")

Method 2: Use socket

import socket

def netcat(hostname, port, content):
    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    s.connect((hostname, port))
    s.sendall(content)
    s.shutdown(socket.SHUT_WR)
    while 1:
        data = s.recv(1024)
        if data == "":
            break
        print "Received:", repr(data)
    print "Connection closed."
    s.close()

netcat("myhostname.com", 2003, "test.bash.stats 14 1459116000")

I don't get an error, but I don't receive data.

Answer 1

You should try concatenating the string like this

os.system("echo 'test.bash.stats 14 " + str(data['time_timestamp']) + " '| nc myhostname.com 2003")

or this

os.system("echo 'test.bash.stats 14 %d '| nc myhostname.com 2003" % data['time_timestamp'])