def test_filter(self):
i = {
'a': 1,
'b': 2,
'c': '4',
'e': '5',
'f': 6,
'g': 7,
}
with self.assertRaises(ValueError):
f = _filter(i, True)
o = _filter(i, lambda key, val: isinstance(val, int))
r = {
'a': 1,
'b': 2,
'f': 6,
'g': 7,
}
self.assertFalse(i is o)
self.assertEqual(o, r)
def filter(self, predicate):
"""
Return a new filtered dict using the given predicate function.
Predicate function receives key, value arguments and should return a bool value.
"""
return _filter(self, predicate)