Holder 0.0.0

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

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())