[danudey]

To add to specifics:

_ in python is commonly used as a variable name for values you want to throw away. For example, let's say you have a log file split on newlines, with records like this:

    logline = "127.0.0.1 localhost.example.com GET /some/url 404 12413"

You want to get all the URLs that are 404s, but you don't care about who requested them, etc. You could do this:

    _, _, _, url, returncode, _ = logline.split(' ')

There's no special behaviour for _ in this case; in fact, normally in the interactive interpreter it's used to store the result of the last evaluated line, like so:

    >>> SomeModel.objects.all()
    [SomeModel(…), SomeModel(…), SomeModel(…), …]
    >>> d = _
    >>> print d
    [SomeModel(…), SomeModel(…), SomeModel(…), …]

Which I think is basically the same behaviour; you run some code, you don't assign it, so the interpreter dumps it into _ and goes on about its day.