我有一个 python 脚本,我在其中使用线程来等待我的树莓派上的输入。这是我第一次使用线程,我在处理键盘中断时遇到了一些困难。这不是一个真正的问题,但如果用户提前按下 control-c,就像程序一启动,python 就会吓坏并喷出一个充满导入错误的控制台。我尝试将导入包装在 try - excepts 中,但这似乎不起作用。我感觉它与线程有关,因为我以前从未遇到过这个问题。
除了将所有内容包装在 try-excepts 中,我还尝试了:
from threading import Thread
cond = threading.Condition(threading.Lock())
cond.acquire()
cond.wait(None)
我听说在加载之前不允许键盘中断?
反正有没有让python在键盘中断上做任何事情?
任何帮助,将不胜感激。谢谢!
我的代码:
import RPi.GPIO as GPIO
import pymysql as mysql
import time
import urllib.request
from threading import Thread
GPIO.setmode(GPIO.BOARD)
GPIO.cleanup()
class table():
__slots__ = ['pin','num','time']
def __init__(self, pin, num, time=0):
self.pin = pin
self.num = num
self.time = time
# Room ID
room = 6
# time (minutes)
thetime = 38
# table Setup
tableList = [ \
table(11,6), \
table(13,2), \
table(15,4), \
table(19,5), \
table(21,3), \
table(23,1), \
]
def settable(table):
with urllib.request.urlopen("http://time.zyphox.com") as url:
curtime = int(url.read())+(thetime*60)
con = mysql.connect(host="345", user="435", passwd="345435", db="34534543")
cur = con.cursor()
cur.execute("UPDATE tables SET time='"+str(curtime)+"' WHERE number='"+str(table)+"' AND id_room='"+str(room)+"'")
cur.close()
con.close()
print("Setting table " + str(table) + " to " + str(thetime) + " minutes...")
def watchtable(table):
GPIO.setup(table.pin, GPIO.IN)
while True:
if(GPIO.input(table.pin)!=1 and table.time <= time.time()):
settable(table.num)
table.time = time.time() + 10
def main():
print("Loading kitchen System...")
for table in tableList:
t = Thread(target=watchtable,args=(table,))
t.daemon=True
t.start()
time.sleep(1)
print("Successful!")
while True:
time.sleep(300)
print("- Pinging MYSQL database.")
main()