[Python] How do I send a POST request as a JSON?

data = {
'ids': [12, 3, 4, 5, 6 , ...]
}
urllib2.urlopen("http://abc.example/api/posts/create",urllib.urlencode(data))


I want to send a POST request, but one of the fields should be a list of numbers. How can I do that? (JSON?)

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