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Question

我有一个使用GPS模块的覆盆子pi。要使用该模块，我运行的代码如下：

##Prints the latitude and longitude every second.
import time
import microstacknode.hardware.gps.l80gps

if __name__ == '__main__':
    gps = microstacknode.hardware.gps.l80gps.L80GPS()
    while True:
        data = gps.get_gpgga()
        List = [list(data.values())[x] for x in [7, 9, 12]]
        string=str(List)
        string = string[1:-1]
        text_file = open("/home/pi/fyp/gps.txt","a")
        text_file.write(string + "\n")
        time.sleep(1)

但是，它偶尔会出现此错误，因为找不到我的位置：

Traceback (most recent call last):
  File "gps.py", line 8, in <module>
    data = gps.get_gpgga()
  File "/usr/lib/python3/dist-packages/microstacknode/hardware/gps/l80gps.py", line 119, in get_gpgga
    pkt = self.get_nmea_pkt('GPGGA')
  File "/usr/lib/python3/dist-packages/microstacknode/hardware/gps/l80gps.py", line 293, in get_nmea_pkt
    "Timed out before valid '{}'.".format(pattern))
microstacknode.hardware.gps.l80gps.NMEAPacketNotFoundError: Timed out before valid 'GPGGA'.

有错误可以。我遇到的麻烦是，如果程序发生，程序就会停止运行。有没有办法捕获该错误并使程序循环回来并重试，即使它遇到此错误？

更新

if I try Stefan_Reinhardt's method, I would get the following error instead:

Traceback (most recent call last):
  File "gps.py", line 9, in <module>
    data = gps.get_gpgga()
  File "/usr/lib/python3/dist-packages/microstacknode/hardware/gps/l80gps.py", line 119, in get_gpgga
    pkt = self.get_nmea_pkt('GPGGA')
  File "/usr/lib/python3/dist-packages/microstacknode/hardware/gps/l80gps.py", line 293, in get_nmea_pkt
    "Timed out before valid '{}'.".format(pattern))
microstacknode.hardware.gps.l80gps.NMEAPacketNotFoundError: Timed out before valid 'GPGGA'.

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "gps.py", line 10, in <module>
    except NMEAPacketNotFoundError:
NameError: name 'NMEAPacketNotFoundError' is not defined

Answer 1

我同意Oisin的回答，但我建议将try-except子句放在可能发生的行的周围，然后使用continue语句传递while循环的其余部分，使其看起来像

##Prints the latitude and longitude every second.
import time
import microstacknode.hardware.gps.l80gps

if __name__ == '__main__':
    gps = microstacknode.hardware.gps.l80gps.L80GPS()
    while True:
        try:
            data = gps.get_gpgga()
        except NMEAPacketNotFoundError:
            continue
        List = [list(data.values())[x] for x in [7, 9, 12]]
        string=str(List)
        string = string[1:-1]
        text_file = open("/home/pi/fyp/gps.txt","a")
        text_file.write(string + "\n")
        time.sleep(1)

Answer 2

这应该可以工作，但它可能会陷入无限递归循环。

##Prints the latitude and longitude every second.
import time
import microstacknode.hardware.gps.l80gps

if __name__ == '__main__':
    getPos()

def getPos():
    try:
        while True:
            gps = microstacknode.hardware.gps.l80gps.L80GPS()
            data = gps.get_gpgga()
            List = [list(data.values())[x] for x in [7, 9, 12]]
            string=str(List)
            string = string[1:-1]
            text_file = open("/home/pi/fyp/gps.txt","a")
            text_file.write(string + "\n")
            time.sleep(1)
    except microstacknode.hardware.gps.l80gps.NMEAPacketNotFoundError:
        getPos()

如何捕获和管理GPS模块的例外？

更新

2 个答案: