How to Change the User Agent for `urllib2.urlopen`?

Alter User Agent for urllib2.urlopen

Issue: How can one download a webpage using urllib2.urlopen with a non-default user agent?

Answer: A similar question was addressed recently. The following code snippet illustrates how to modify the user agent:

<code class="python">opener = urllib2.build_opener()
opener.addheaders = [('User-Agent', 'Mozilla/5.0')]
response = opener.open('http://www.stackoverflow.com')</code>

Note that 'User-Agent' should be capitalized per RFC 2616, section 14.43.

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