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Python partial on steroids

Project description

Python partial on steroids

https://travis-ci.org/5monkeys/partialize.png?branch=master

Like python functools.partial but with change/extend access to args and kwargs. Also a great tool even if no partial is needed but the function takes args/kwargs that often depends on logic.

Easiest used as a decorator

from partialize import partialize

@partialize
def dummy(a, b, c=None):
    return 'hello world'

partial_dummy = dummy.partial(1)
partial_dummy.b = 2
partial_dummy(c=3)

or invoked inline…

partial_dummy = partialize(dummy)
partial_dummy.a = 1
partial_dummy.update(b=2)
partial_dummy()
partial_dummy(c=3)

Use it on functions that needs logic to affect arguments passed, instead of building and passing a dict as kwargs which often gets quite messy and hard to read.

Dict kwargs example:

from partialize import partialize

@partialize
def search_products(site, query=None, brand=None, tags=None):
    pass

kwargs = {}

if logic:
    kwargs['query'] = q

if more_logic:
    kwargs['brand'] = 'brand name'

products = search_products(site, **kwargs)

Partialize example:

search = search_products.partial(site)

if logic:
    search.query = q

if more_logic:
    search.brand = 'brand name'

products = search()
Note: function argument names are validated when set, unlike dict string keys.

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