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Caches a result, and returns it. Useful in if statements.

Project description

In python it is not possible to do this:
::
if temp=do_something() == 42:
foo(temp)
::

And storing it before is not an option?
(you have something very resources-expensive, or changing values)

::
temp = do_something()
temp2 = do_something_else()
if temp == 42:
foo(temp)
elif temp2:
foo2(temp2)
::

Somebody need to hold that result for you:

::
h = Holder()
if h(do_something()) == 42:
foo(h())
elif h(do_something_else()):
foo2(h())

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