Opening A large JSON file

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You want an incremental json parser like yajl and one of its python bindings. An incremental parser reads as little as possible from the input and invokes a callback when something meaningful is decoded. For example, to pull only numbers from a big json file:

class ContentHandler(YajlContentHandler):
    def yajl_number(self, ctx, val):
         list_of_numbers.append(float(val))

parser = YajlParser(ContentHandler())
parser.parse(some_file)

See http://pykler.github.com/yajl-py/ for more info.

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