Python同时检查来自控制台和串行的输入吗？

debugcn 发表于 Dev

mαττjαĸøb

我正在编写一个python应用程序，该应用程序从控制台读取用户输入：

buff = raw_input('Enter code: ')

并根据一系列算法生成和输出。

我的问题是该应用程序还通过串行连接到另一台设置某些状态配置属性的机器。要从串行（COM）端口读取字符串，我正在使用PySerial库：

ser = serial.Serial('/dev/ttyAMA0')
ser.baudrate = 115200
[...]
if not(ser.isOpen()):
  ser.open()
s = ser.readline()

如何同时检查两个输入？raw_input（）会停止执行程序，直到提交字符串为止，从而阻止检查在此期间是否通过串行端口发送了某些内容。等待串行输入时同样适用。

我想避免多线程（代码在RaspberryPi上运行），因为它可能会增加过多的复杂性。

谢谢！j

雅各布·鲍耶（Jakob Bowyer）

选择是您的朋友例子取自这里

import sys
import select
import time

# files monitored for input
read_list = [sys.stdin]
# select() should wait for this many seconds for input.
# A smaller number means more cpu usage, but a greater one
# means a more noticeable delay between input becoming
# available and the program starting to work on it.
timeout = 0.1 # seconds
last_work_time = time.time()

def treat_input(linein):
  global last_work_time
  print("Workin' it!", linein, end="")
  time.sleep(1) # working takes time
  print('Done')
  last_work_time = time.time()

def idle_work():
  global last_work_time
  now = time.time()
  # do some other stuff every 2 seconds of idleness
  if now - last_work_time > 2:
    print('Idle for too long; doing some other stuff.')
    last_work_time = now

def main_loop():
  global read_list
  # while still waiting for input on at least one file
  while read_list:
    ready = select.select(read_list, [], [], timeout)[0]
    if not ready:
      idle_work()
    else:
      for file in ready:
        line = file.readline()
        if not line: # EOF, remove file from input list
          read_list.remove(file)
        elif line.rstrip(): # optional: skipping empty lines
          treat_input(line)

try:
    main_loop()
except KeyboardInterrupt:
  pass

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