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functools_partial.py

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#!/usr/bin/env python

# encoding: utf-8

import functools

def myfunc(a, b=2):

"""Docstring for myfunc()."""

print '\tcalled myfunc with:', (a, b)

return

def show_details(name, f, is_partial=False):

"""Show details of a callable object."""

print '%s:' % name

print '\tobject:', f

if not is_partial:

print '\t__name__:', f.__name__

print '\t__doc__', repr(f.__doc__)

if is_partial:

print '\tfunc:', f.func

print '\targs:', f.args

print '\tkeywords:', f.keywords

return

show_details('myfunc', myfunc)

myfunc('a', 3)

print

p1 = functools.partial(myfunc, b=4)

show_details('partial with named default', p1, True)

p1('default a')

p1('override b', b=5)

print

p2 = functools.partial(myfunc, 'default a', b=99)

show_details('partial with defaults', p2, True)

p2()

p2(b='override b')

print

print 'Insufficient arguments:'

p1()