Python线程在加入后不关闭

我正在使用类似的代码作为波纹管来控制RGB LED灯带，随机值每隔几秒进来一次，并且正在创建3个线程来控制3个单独的颜色。Python线程在加入后不关闭

import time 
from ast import literal_eval 
import threading 
from random import randint 
t=[] 
myR =0 
myG =0 
myB =0 
temp = 0 
pins = [17,22,24] 
myColours = [myR,myG,myB] 
red_pin = 17 
green_pin = 22 
blue_pin = 24 

def change_led_color(rgb): 
    global myR 
    global myG 
    global myB 
    y = 0 
    threads = [] 
    for colour in rgb: 
    t = threading.Thread(target=leds,name=pins[y] ,args=(y,myColours[y],colour,pins[y])) 
    threads.append(t) 
    y += 1 
    for y in threads: 
    y.start() 
    for y in threads: 
    y.join() 

def leds(index,start,end,pin): 
    temp=0 
    for i in range(start,end): 
    time.sleep(0.01) 
    temp = i 
    global myColours 
    print 'pin', pin, 'started at: ',start,' ended is: ', temp 
    myColours[index] = end 

def set_colours(): 
    print '..................................................................',t 
    print threading.activeCount(),'threads \n' 
    threading.Timer(2, set_colours).start() 
    change_led_color(t) 
set_colours() 

def get_data(): 
    while True: 
     global t 
     t = (randint(0,255),randint(0,255),randint(0,255)) 
     time.sleep(2) 
threading.Thread(target=get_data).start()

上面运行正常，但反应是很奇怪的，而不是让所有的三种颜色的线程结束时，我有时会超过预期，大部分的时间中的至少一个为0，像线程永远不会运行！我假设我以某种方式滥用穿线。

例如，结果

.................................................................. (187, 223, 42) 
3 threads 

pin 24 started at: 205 ended is: 0 
pin 22 started at: 170 ended is: 222 
pin 17 started at: 107 ended is: 186 
.................................................................. (202, 115, 219) 
3 threads 

pin 22 started at: 223 ended is: 0 
pin 17 started at: 187 ended is: 201 
.................................................................. (244, 35, 194) 
5 threads 

pin 22 started at: 115 ended is: 0 
pin 24 started at: 42 ended is: 218 
pin 17 started at: 202 ended is: 243 
pin 24 started at: 42 ended is: 193 
.................................................................. (54, 25, 72) 
3 threads 

pin 17 started at: 244 ended is: 0 
pin 22 started at: 35 ended is: 0 
pin 24 started at: 194 ended is: 0

来源

2016-11-29 Stratos Ion

你的假设是正确的。任何时候你在线程代码中看到'global'，你都知道你可能做错了。 –

是否有任何理由在这里实际使用线程？为什么不只是更新三个LED，因为更新几乎不需要时间？ – chthonicdaemon

我使用线程的原因是我试图在变化之间实现平滑过渡，因此使用'for i in range..'来同时执行三种颜色的转换。 –