Is there a short-circuiting dictionary "get" method?

[Jeff Epler]

untested

def my_getter(m, i, f):
    try:
        return m[i]
    except (KeyError, IndexError):
        return f()

my_getter(d, 'x', bigscaryfunction)
my_getter(d, 'y', lambda: scaryinlineexpresion)
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