python - 按下按钮执行功能

Question

首先,这是我第一次使用python,所以请耐心等待:)

我正试图从亚马逊破解一个破折号按钮来切换我的飞利浦色调灯,我设法找到所有必需的元素和代码并编辑它以满足我的需要.

我现在遇到的问题是,如果我运行脚本,我想运行的python中的函数立即执行并且不等待按下按钮...

这是一些代码:

from pydhcplib.dhcp_network
import *
import requests, json

bridgeIP = "{{mybridgeIP}}"
user = "{{philipsUserID}}"
dashMac = "{{dashMacAddress}}"
lightID = "4"

def do_something():
    print("button has been pressed")

def toggleLight(lightID):
    url = "http://" + bridgeIP + "/api/" + user + "/lights/" + lightID
    r = requests.get(url)
    data = json.loads(r.text)
    if data["state"]["on"] == False:
      r = requests.put(url + "/state", json.dumps({
        'on': True
      }))
    elif data["state"]["on"] == True:
      r = requests.put(url + "/state", json.dumps({
        'on': False
        }))


netopt = {'client_listen_port':"68", 'server_listen_port':"67", 'listen_address':"0.0.0.0"}

class Server(DhcpServer):
    def __init__(self, options, dashbuttons):
        DhcpServer.__init__(self, options["listen_address"],
                                options["client_listen_port"],
                                options["server_listen_port"])
        self.dashbuttons = dashbuttons

    def HandleDhcpRequest(self, packet):
        mac = self.hwaddr_to_str(packet.GetHardwareAddress())
        self.dashbuttons.press(mac)


    def hwaddr_to_str(self, hwaddr):
        result = []
        hexsym = ['0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f']
        for iterator in range(6) :
            result += [str(hexsym[hwaddr[iterator]/16]+hexsym[hwaddr[iterator]%16])]
        return ':'.join(result)

class DashButtons():
    def __init__(self):
        self.buttons = {}

    def register(self, mac, function):
        self.buttons[mac] = function

    def press(self, mac):
        if mac in self.buttons:
            self.buttons[mac]()
            return True
        return False


dashbuttons = DashButtons()
dashbuttons.register(dashMac, do_something)
dashbuttons.register(dashMac, toggleLight(lightID))
server = Server(netopt, dashbuttons)

while True :
    server.GetNextDhcpPacket()

我的问题是do_something()被正确调用(当我按下按钮时),但是toggleLight(lightID)一旦我运行脚本就会调用它.

我不明白为什么,他们看起来和我相同..

你能帮我理解吗？谢谢

Answer 1

有了这条线

dashbuttons.register(dashMac, toggleLight(lightID))

执行toggleLight(lightID)并将该调用的结果绑定到function参数.由于该函数采用参数,因此您也不能通过toggleLight.相反,使用lambda函数:

dashbuttons.register(dashMac, lambda: toggleLight(lightID))

这将创建一个新的匿名函数,该函数不带参数,并toggleLight(lightID)在按钮调用时调用.