A little present.
hanche at math.ntnu.no
Mon Feb 14 19:38:16 EST 2000
+ Michael Hudson <mwh21 at cam.ac.uk>:
| >>> from papply import X
| >>> map(X(t,(),73),range(10))
| The idea is that after a call to X(func,...) there are a number of
| `holes' (notated by an empty tuple) in the arglist that can be `filled
| in' by subsequent calls (to what X returns). This means you can't
| presupply the empty tuple to func, but I couldn't think of a better
| It's a bit like currying, but more general.
Useful, but a bit complicated methinks. I recently cooked up this
somewhat simpler class, to solve a commonly occuring variant of your
'"Apply" a function to too few args, returning a function.'
def __init__(self, proc, *args):
self.args = args
self.proc = proc
self.ignore = 0
def ignoring(self, ignore):
'Make this class, when called, ignore this many initial args'
self.ignore = ignore
def __call__(self, *args):
apply(self.proc, self.args + args[self.ignore:])
I particularly like the option of binding preapply(f).ignoring(1) to a
Tkinter event, for all those cases when f has no need of the event
parameter itself. (No, I am not proud of the docstrings.)
* Harald Hanche-Olsen <URL:http://www.math.ntnu.no/~hanche/>
- "There arises from a bad and unapt formation of words
a wonderful obstruction to the mind." - Francis Bacon
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