[英]How to keep the value of a variable despite function being called multiple times?
I have a python function that will turn the servo to the left or right everytime a button on the web interface is clicked. 我有一个python函数,每次单击Web界面上的按钮时,该函数都会将伺服器向左或向右旋转。 Currently it is working like this:
目前它正在这样工作:
@cherrypy.expose
def turnCamera (self, **data):
import pigpio
import time
servos=[4,7] #GPIO number
pigpio.start()
key = data['direction']
if key=="left":
servostatus = "left"
print servostatus
m=1500
elif key=="right":
servostatus = "right"
print servostatus
m=1000
#to dispense pill
if key=="dispense":
m=900
pigpio.set_servo_pulsewidth(servos[0], m)
servostat= "Position of servo: %s"%m
print servostat
time.sleep(1)
m=1500
pigpio.set_servo_pulsewidth(servos[0], m)
servostat= "Position of servo: %s"%m
print servostat
time.sleep(1)
pigpio.stop()
return servostat
The data is posted from jQuery: 数据是从jQuery发布的:
$('#left_button').click(function(){
$.post('/turnCamera', {direction:"left"}).done(function (reply) {
$('#camerapos').empty().append(reply);
alert("left button clicked");});
});
$('#right_button').click(function(){
$.post('/turnCamera', {direction:"right"}).done(function (reply) {
$('#camerapos').empty().append(reply);
alert("right button clicked");});
});
However I would like the servo to turn such that each click will make it turns by 100. When the script is first run, it goes to initial position m=1500
. 但是,我希望伺服器转动,使每次单击都可以使它转动100。第一次运行脚本时,它将转到初始位置
m=1500
。 Then user can control the camera position by clicking left or right. 然后,用户可以通过单击左或右来控制摄像机的位置。 Something like this:
像这样:
m=1500
while (m >= 500 and m <= 2500):
if (key =="left"):
m=m+100
elif (key =="right"):
m=m-100
However i do understand that this will not work because m will get reset to 1500 everytime the function is triggered (button is clicked). 但是我确实知道这是行不通的,因为每次触发该功能(单击按钮)时,m都会重置为1500。 How can i store the value of m?
如何存储m的值?
You can make the method 你可以做方法
return [servostat, m]
and then change the method so that it has a parameter where you pass in the m from the previous call like def turnCamera(self, **data, m):
然后更改方法,使其具有一个参数,您可以在其中传递上一个调用中的m,例如
def turnCamera(self, **data, m):
As follows: 如下:
$('#left_button').click(function(){
$.post('/turnCamera', {direction:"left",m_value:m}).done(function (reply) {
$('#camerapos').empty().append(reply);
alert("left button clicked");});
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