【发布时间】:2016-07-24 07:51:22
【问题描述】:
我在启动时运行一个脚本,并且每一秒都用 Python 编写。它可以在有限的时间内正常工作(似乎变化约 5/10 分钟),然后产生以下错误。
我没有尝试更改睡眠时间,因为这是一个“测试”脚本,但我将使用必须每秒运行一次的脚本,因此试图找到正确的方法。
谷歌似乎在答案方面几乎没有产生什么,也许我使用了错误的术语,但我不确定它的睡眠时间是否可能是 ping IP 失败?
Python
import time, urllib2
def internet_on():
try:
response=urllib2.urlopen('http://64.233.160.94',timeout=1)
return '<img class="right" src="networkon.png" width="32" height="32">'
except urllib2.URLError as err: pass
return '<img class="right" src="networkoff.png" width="32" height="32">'
output = internet_on()
f = open('/var/www/html/viv/wifiout.html', 'w')
print >> f, output
f.close()
time.sleep(1)
while True:
internet_on()
HTML
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Vivarium Enviroment Control Centre</title>
<link rel="stylesheet" href="style.css">
<script src="https://code.jquery.com/jquery-1.12.0.min.js"></script>
<script type="text/javascript">
function updateTime() {
var currentTime = new Date();
var hours = currentTime.getHours();
var minutes = currentTime.getMinutes();
var seconds = currentTime.getSeconds();
if (minutes < 10){
minutes = "0" + minutes;
}
if (seconds < 10){
seconds = "0" + seconds;
}
var v = hours + ":" + minutes + ":" + seconds + " ";
if(hours > 11){
v+="PM";
} else {
v+="AM"
}
setTimeout("updateTime()",1000);
document.getElementById('time').innerHTML=v;
}
$("document").ready(function(){
updateTime();
setInterval(function(){
$("#wifi").load('wifiout.html');
},1000);
});
function changeStatus() {
var image = document.getElementById('lightStatus');
if (image.src.match("lightoff")) {
image.src = "lighton.png";
} else {
image.src = "lightoff.png";
}
}
</script>
</head>
<body>
<div id="topbar">
<span id="time"></span>
<span id="wifi"></span>
<img id="lightStatus" class="right" onclick="changeStatus()" src="lightoff.png" width="32" height="32">
</div>
</body>
</html>
运行一段时间后抛出的错误
pi@Vivarium:~ $ sudo python /home/pi/Desktop/wifi.py
Traceback (most recent call last):
File "/home/pi/Desktop/wifi.py", line 17, in <module>
internet_on()
File "/home/pi/Desktop/wifi.py", line 8, in internet_on
urllib2.urlopen('http://64.233.160.94',timeout=1)
File "/usr/lib/python2.7/urllib2.py", line 154, in urlopen
return opener.open(url, data, timeout)
File "/usr/lib/python2.7/urllib2.py", line 437, in open
response = meth(req, response)
File "/usr/lib/python2.7/urllib2.py", line 550, in http_response
'http', request, response, code, msg, hdrs)
File "/usr/lib/python2.7/urllib2.py", line 469, in error
result = self._call_chain(*args)
File "/usr/lib/python2.7/urllib2.py", line 409, in _call_chain
result = func(*args)
File "/usr/lib/python2.7/urllib2.py", line 656, in http_error_302
return self.parent.open(new, timeout=req.timeout)
File "/usr/lib/python2.7/urllib2.py", line 437, in open
response = meth(req, response)
File "/usr/lib/python2.7/urllib2.py", line 550, in http_response
'http', request, response, code, msg, hdrs)
File "/usr/lib/python2.7/urllib2.py", line 469, in error
result = self._call_chain(*args)
File "/usr/lib/python2.7/urllib2.py", line 409, in _call_chain
result = func(*args)
File "/usr/lib/python2.7/urllib2.py", line 656, in http_error_302
return self.parent.open(new, timeout=req.timeout)
File "/usr/lib/python2.7/urllib2.py", line 431, in open
response = self._open(req, data)
File "/usr/lib/python2.7/urllib2.py", line 449, in _open
'_open', req)
File "/usr/lib/python2.7/urllib2.py", line 409, in _call_chain
result = func(*args)
File "/usr/lib/python2.7/urllib2.py", line 1227, in http_open
return self.do_open(httplib.HTTPConnection, req)
File "/usr/lib/python2.7/urllib2.py", line 1200, in do_open
r = h.getresponse(buffering=True)
File "/usr/lib/python2.7/httplib.py", line 1073, in getresponse
response.begin()
File "/usr/lib/python2.7/httplib.py", line 415, in begin
version, status, reason = self._read_status()
File "/usr/lib/python2.7/httplib.py", line 371, in _read_status
line = self.fp.readline(_MAXLINE + 1)
File "/usr/lib/python2.7/socket.py", line 476, in readline
data = self._sock.recv(self._rbufsize)
socket.timeout: timed out
【问题讨论】:
-
您的问题似乎与缺乏连接有关,这可能是以下两个问题之一:代理或目标服务器缺乏响应。第一个问题与 python 中的脚本不使用机器上的凭据有关,因此,如果您在途中有代理,它将不会进行身份验证并给出错误。
-
没有代理设置或使用所以目标服务器问题。原因是什么?那是谷歌的 IP,所以我使用它时假设它不会因为谷歌的规模而引起问题。
-
那么,您完全确定您使用的网络不需要代理吗?因为这是企业网络中非常常见的问题。
-
我在家。但我确实在工作和家庭中遇到了同样的问题和时间安排。
-
您是否意识到您提供的 python 脚本使用该函数返回的单个
<img>标记覆盖了您的 html 文件,然后不断尝试检索数据,直到实际检索需要超过一秒钟数据?您几乎肯定会给网络连接带来巨大压力,这很可能需要一秒钟以上,因为服务器需要一些时间来刷新一些捕获,internet_on()在 while 循环中运行多少次才会给您错误?
标签: python python-2.7 timeout urllib2