Retrieve some info from the web automatically

I need to retrieve some info from web. For example, I can visit weather.com to search my zip code to get H开发者_如何学GoTML file that contains the temperature or something. I need to make a python script to do this automatically.

I think there are two ways to do this.

1. Run wget to download the web page, parse it to get the information I want.
2. If the website provides the web service, just run it to get the info.

And these are my questions.

1. What function do I use for the web service in python?
2. How can I know if a web site provides what web service?
3. If web service is not provided, is there a better way than run wget and parse?

If you can give me some examples, that would be much better.

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The wget part is definitely unnecessary, urllib and httplib both let you download a web page; their doc pages have examples