Suppose you have a function "sum(a, b)". This class lets you do things like:
plus4 = Curry(sum, 4)
print plus4(5)
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Copy to clipboard1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 | """This class is a curry (think functional programming)."""
__docformat__ = "restructuredtext"
class Curry:
"""This class is a curry (think functional programming).
The following attributes are used:
f
This is the function being curried.
initArgs, initKargs
These are the args and kargs to pass to ``f``.
"""
def __init__(self, f, *initArgs, **initKargs):
"""Accept the initial arguments and the function."""
self.f = f
self.initArgs = initArgs
self.initKargs = initKargs
def __call__(self, *args, **kargs):
"""Call the function."""
updatedArgs = self.initArgs + args
updatedKargs = self.initKargs.copy()
updatedKargs.update(kargs)
return self.f(*updatedArgs, **updatedKargs)
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In Python 2.3 or greater, it's easy to get this same functionality using a lambda acting as a closure.
Tags: shortcuts
Xoltar Toolkit. Check out the Xoltar Toolkit at http://www.xoltar.org/languages/python.html
The "functional" module has a better implementation of curry that allows you to do things like curry parameters out of order. The other methods in there are quite useful as well.
Matches recipe 52549. Remove any explicitly named parameters. I'm not sure how this differs much from:
From the reactions I've had from that, I'd change the first few lines of each method to:
This allows keyword currying or providing of _all_ parameters as named parameters.