Not as such. Python intentionally didn't include assignment within
statements (mostly conditionals) to avoid the common issue of
assignments-instead-of-equality bugs.
If `new_stuff` has a default value, you could always write.
new_stuff = some_function() or new_stuff
which will reassign `new_stuff` to itself if `some_function()` returns a
falsy value. If you need a more complex conditional body than just an
assignment, you'll need the long one.