多线程不起作用

Question

@KSFT

currently frustrated by my inability to either decipher the formatting on stackoverflow OR make a simple python script work...

whats wrong here?

the program prompts for input to determine the value of dwell but it does not result in an led turning on.

import threading
import RPi.GPIO as GPIO
import time
GPIO.setmode(GPIO.BCM)
GPIO.setup(7, GPIO.OUT)
frequency = 0.05
dwell = 0.01


def get_input():
    while True:
        dwell=raw_input("Brightness: ")

input_thread=threading.Thread(target=get_input())
input_thread.start()

while True:
    time.sleep(frequency)
        GPIO.output(7, 1)
        time.sleep(dwell)
        GPIO.output(7, 0)

Answer 1

input_thread=threading.Thread(target=get_input())   

is wrong!

input_thread=threading.Thread(target=get_input) 

is right!

threading

class threading.Thread(group=None, target=None, name=None, args=(), kwargs={})

If you want to give arg to get_input ,you need to give it throw args and kwargs.

Example:

 1 #!/usr/bin/python
 2 #current's number of threads
 3 import threading
 4 import time
 5 
 6 def worker():
 7     print "test"
 8     time.sleep(1)
 9 
 10 for i in xrange(5):
 11     t = threading.Thread(target=worker)
 12     t.start()
 13 
 14 print "current has %d threads" % (threading.activeCount() - 1)

target=worker().

target=worker.