python - 即使在发生错误后继续 python 脚本

Question

我有一个 Python 脚本可以记录我房间的温度并使用请求库发送数据。有时我会失去 wifi 信号，脚本会在请求出错后完全停止。

import sys
import time
import Adafruit_DHT
import requests

raspid = 1
sensor = 11
pin = 25

while True:   
    humidity, temperature = Adafruit_DHT.read_retry(sensor, pin)
    if humidity is not None and temperature is not None:
        datos = {'temperatura': 'temperature', 'humedad': 'humidity', 'raspid': 'raspid'}
        r = requests.post("http://httpbin.org/post", data=datos)
        print(r.text)
    else:
        print ('Error de lectura!')
        time.sleep(15)

wifi断开时出错

Traceback (most recent call last):
  File "/home/pi/Desktop/dht11 request post.py", line 19, in <module>
    r = requests.post("http://mehr.cl/link.php", data=datos)
  File "/usr/lib/python2.7/dist-packages/requests/api.py", line 94, in post
    return request('post', url, data=data, json=json, **kwargs)
  File "/usr/lib/python2.7/dist-packages/requests/api.py", line 49, in request
    return session.request(method=method, url=url, **kwargs)
  File "/usr/lib/python2.7/dist-packages/requests/sessions.py", line 457, in request
    resp = self.send(prep, **send_kwargs)
  File "/usr/lib/python2.7/dist-packages/requests/sessions.py", line 569, in send
    r = adapter.send(request, **kwargs)
  File "/usr/lib/python2.7/dist-packages/requests/adapters.py", line 407, in send
    raise ConnectionError(err, request=request)
ConnectionError: ('Connection aborted.', error(101, 'Network is unreachable'))
>>> 

有没有办法忽略错误并重试？

Answer 1

是的，有。它正是在尝试并捕获引发的任何错误。

基本上它是这样工作的:

try:
    # Some action that could raise an error

except:
    # What to do when an error occurs

如需更深入的解释，请查看文档:Errors and Exceptions .

有几个内置的异常，其中，ConnectionError。如果您知道您期望的确切异常，则必须将其添加到 except 子句中:

try:
    # Actions that might raise a ConnectionError

except ConnectionError:
    # Process the error, for instance, try again