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How to implement timeout control for urlllib2.urlopen

How to implement control for urlllib2.urlopen in Python? I just want to keep track of if after 5 seconds the XML data does not return, disconnect this connection and reconnect? Should I use some kind of timer? THX

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urllib2.urlopen("http://www.example.com", timeout=5)
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From the urllib2documentation ...

An additional timeout parameter defines the timeout in seconds for blocking operations, such as a connection attempt (if not specified, the global default timeout setting will be used). This actually works for HTTP, HTTPS and FTP connections.

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