Question

我正在为我的Raspberry Pi安装一个温度传感器并遇到了这个问题。为了运行代码中指定的驱动程序，我不得不运行它是一个shell命令。我很难搞清楚为什么我的语法不正确。

代码：

def read_dht22( PiPin ):
        output = subprocess.check_output([shell=True], ['/home/pi/Adafruit-Raspberry-Pi-Python-Code/Adafruit__DHT_Driver", "2302", str(PiPin)])

错误：

sudo python scr6.py
  File "scr6.py", line 31
    output = subprocess.check_output([shell=True], ['/home/pi/Adafruit-Raspberry-Pi-Python-Code/Adafruit_DHT_Driver', '2302', str(PiPin)])
                                           ^
SyntaxError: invalid syntax

添加shell之前的错误= True

sudo python scr5.py
Traceback (most recent call last):
  File "scr5.py", line 46, in <module>
    temp_c, temp_f = read_dht22(4)
  File "scr5.py", line 31, in read_dht22
    output = subprocess.check_output(["/home/pi/Adafruit-Raspberry-Pi-Python-Code/Adafruit_DHT_Driver", "2302", str(PiPin)])
  File "/usr/lib/python2.7/subprocess.py", line 537, in check_output
    process = Popen(stdout=PIPE, *popenargs, **kwargs)
  File "/usr/lib/python2.7/subprocess.py", line 679, in __init__
    errread, errwrite)
  File "/usr/lib/python2.7/subprocess.py", line 1259, in _execute_child
    raise child_exception
OSError: [Errno 13] Permission denied

Answer 1

这应该可以解决您的语法错误：

def read_dht22( PiPin ):
    output = subprocess.check_output(["/home/pi/Adafruit-Raspberry-Pi-Python-Code/Adafruit__DHT_Driver", "2302", str(PiPin)], shell=True)

调用Raspberry Pi临时传感器时，将驱动程序作为bash脚本调用时语法无效

1 个答案: