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import functional
import unittest
from test import test_support
from weakref import proxy
@staticmethod
def PythonPartial(func, *args, **keywords):
'Pure Python approximation of partial()'
def newfunc(*fargs, **fkeywords):
newkeywords = keywords.copy()
newkeywords.update(fkeywords)
return func(*(args + fargs), **newkeywords)
newfunc.func = func
newfunc.args = args
newfunc.keywords = keywords
return newfunc
def capture(*args, **kw):
"""capture all positional and keyword arguments"""
return args, kw
class TestPartial(unittest.TestCase):
thetype = functional.partial
def test_basic_examples(self):
p = self.thetype(capture, 1, 2, a=10, b=20)
self.assertEqual(p(3, 4, b=30, c=40),
((1, 2, 3, 4), dict(a=10, b=30, c=40)))
p = self.thetype(map, lambda x: x*10)
self.assertEqual(p([1,2,3,4]), [10, 20, 30, 40])
def test_attributes(self):
p = self.thetype(capture, 1, 2, a=10, b=20)
# attributes should be readable
self.assertEqual(p.func, capture)
self.assertEqual(p.args, (1, 2))
self.assertEqual(p.keywords, dict(a=10, b=20))
# attributes should not be writable
if not isinstance(self.thetype, type):
return
self.assertRaises(TypeError, setattr, p, 'func', map)
self.assertRaises(TypeError, setattr, p, 'args', (1, 2))
self.assertRaises(TypeError, setattr, p, 'keywords', dict(a=1, b=2))
def test_argument_checking(self):
self.assertRaises(TypeError, self.thetype) # need at least a func arg
try:
self.thetype(2)()
except TypeError:
pass
else:
self.fail('First arg not checked for callability')
def test_protection_of_callers_dict_argument(self):
# a caller's dictionary should not be altered by partial
def func(a=10, b=20):
return a
d = {'a':3}
p = self.thetype(func, a=5)
self.assertEqual(p(**d), 3)
self.assertEqual(d, {'a':3})
p(b=7)
self.assertEqual(d, {'a':3})
def test_arg_combinations(self):
# exercise special code paths for zero args in either partial
# object or the caller
p = self.thetype(capture)
self.assertEqual(p(), ((), {}))
self.assertEqual(p(1,2), ((1,2), {}))
p = self.thetype(capture, 1, 2)
self.assertEqual(p(), ((1,2), {}))
self.assertEqual(p(3,4), ((1,2,3,4), {}))
def test_kw_combinations(self):
# exercise special code paths for no keyword args in
# either the partial object or the caller
p = self.thetype(capture)
self.assertEqual(p(), ((), {}))
self.assertEqual(p(a=1), ((), {'a':1}))
p = self.thetype(capture, a=1)
self.assertEqual(p(), ((), {'a':1}))
self.assertEqual(p(b=2), ((), {'a':1, 'b':2}))
# keyword args in the call override those in the partial object
self.assertEqual(p(a=3, b=2), ((), {'a':3, 'b':2}))
def test_positional(self):
# make sure positional arguments are captured correctly
for args in [(), (0,), (0,1), (0,1,2), (0,1,2,3)]:
p = self.thetype(capture, *args)
expected = args + ('x',)
got, empty = p('x')
self.failUnless(expected == got and empty == {})
def test_keyword(self):
# make sure keyword arguments are captured correctly
for a in ['a', 0, None, 3.5]:
p = self.thetype(capture, a=a)
expected = {'a':a,'x':None}
empty, got = p(x=None)
self.failUnless(expected == got and empty == ())
def test_no_side_effects(self):
# make sure there are no side effects that affect subsequent calls
p = self.thetype(capture, 0, a=1)
args1, kw1 = p(1, b=2)
self.failUnless(args1 == (0,1) and kw1 == {'a':1,'b':2})
args2, kw2 = p()
self.failUnless(args2 == (0,) and kw2 == {'a':1})
def test_error_propagation(self):
def f(x, y):
x / y
self.assertRaises(ZeroDivisionError, self.thetype(f, 1, 0))
self.assertRaises(ZeroDivisionError, self.thetype(f, 1), 0)
self.assertRaises(ZeroDivisionError, self.thetype(f), 1, 0)
self.assertRaises(ZeroDivisionError, self.thetype(f, y=0), 1)
def test_attributes(self):
p = self.thetype(hex)
try:
del p.__dict__
except TypeError:
pass
else:
self.fail('partial object allowed __dict__ to be deleted')
def test_weakref(self):
f = self.thetype(int, base=16)
p = proxy(f)
self.assertEqual(f.func, p.func)
f = None
self.assertRaises(ReferenceError, getattr, p, 'func')
class PartialSubclass(functional.partial):
pass
class TestPartialSubclass(TestPartial):
thetype = PartialSubclass
class TestPythonPartial(TestPartial):
thetype = PythonPartial
def test_main(verbose=None):
import sys
test_classes = (
TestPartial,
TestPartialSubclass,
TestPythonPartial,
)
test_support.run_unittest(*test_classes)
# verify reference counting
if verbose and hasattr(sys, "gettotalrefcount"):
import gc
counts = [None] * 5
for i in xrange(len(counts)):
test_support.run_unittest(*test_classes)
gc.collect()
counts[i] = sys.gettotalrefcount()
print counts
if __name__ == '__main__':
test_main(verbose=True)
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