如何连续运行一个例程，直到在命令行中输入输入？ - Python

Question

目前，我有一个程序旨在通过套接字通信向电机连续发送坐标（编码为ASCII），以便电机以正弦运动运动。我希望将这些坐标连续发送到电机，直到用户在命令行中输入 end。

我目前有这个：

import socket
import numpy as np
import math

pi = math.pi

s1 = socket.socket(socket.AF_INET, socket.SOCK_STREAM) #TCP Server Connection
s1.connect(("192.168.177.200", 4001))

gearpositionlim = 10000

# sample sine 
step = 2*pi / 2000
time_range = np.arange(0,2*pi + step,step)
x_motorrange = gearpositionlim*np.sin(time_range)
x_motorrange = ['la'+str(int(i)) for i in x_motorrange]

def motormove():
    for i in np.arange(0,len(x_motorrange)):
        s1.send(str(str(x_motorrange[i])+"\n").encode("ASCII"))
        message = s1.recv(1024).decode()

#-------------------------------------------
while True:
    motormove()
    name = input("Code Running: Type 'end' to end program: ")
    if name == 'end':
        break
    else:
        print("ERROR: Home position not returned to")
        exit()
#send the motor back to home position
s1.send("la0\n".encode("ASCII"))
s1.send("m\n".encode("ASCII"))
s1.send("np\n".encode("ASCII"))
s1.send("DI\n".encode("ASCII"))

但是，代码目前只发送一次坐标x_motorrange，然后给出输入提示输入end。然而，我希望此提示始终出现在命令行中，并且例程 motormove() 仅在给出提示 end 时停止。这怎么能做到？

Answer 1

您可以使用 KeyboardInterrupt 而不是 exit。所以当你按下 ctrl+c 时它会停止：

try:
    while True:
        do_something()
except KeyboardInterrupt:
    pass

Answer 2

有很多方法可以解决这个问题：

例如，将一段代码移动到另一个线程或进程

import threading
import socket
import time

import numpy as np
import math


class MotoMover(threading.Thread):
    def __init__(self):
        threading.Thread.__init__(self)
        pi = math.pi
        self.id = 0
        self.s1 = socket.socket(socket.AF_INET, socket.SOCK_STREAM)  # TCP Server Connection
        self.s1.connect(("192.168.177.200", 4001))

        gearpositionlim = 10000

        # sample sine
        step = 2 * pi / 2000
        time_range = np.arange(0, 2 * pi + step, step)
        self.x_motorrange = gearpositionlim * np.sin(time_range)
        self.x_motorrange = ['la' + str(int(i)) for i in self.x_motorrange]
        self.connected = False
        self.stopped = False

    def try_to_connect(self):
        try:
            self.s1.settimeout(1000)
            self.s1.connect(("192.168.177.200", 4001), timeout=1000)
            self.connected = True
        except:
            self.connected = False

    def motormove(self):
        for i in np.arange(0, len(self.x_motorrange)):
            self.s1.send(str(str(self.x_motorrange[i]) + "\n").encode("ASCII"))
            message = self.s1.recv(1024).decode()

    def run(self): ## main cycle of the thread
        while not self.stopped:
            if not self.connected:
                #            print('connecting to server...')
                self.try_to_connect()
            else:
                self.id += 1
                self.motormove()
            time.sleep(1) #pause = 1 sec. you can reduce it to a few ms (0.01, for example), but I do not recommend removing it completely

    def stop(self):
        self.stopped = True


def main():
    moto = MotoMover()
    moto.start()

    while True:
        name = input("Code Running: Type 'end' to end program: ")
        if name.startswith('end'):
            print("end of the program")
            moto.stop()
            moto.join()
            exit(0)
        else:
            print('!', name)
            if len(name) >= 3:
                name = ''


main()

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