micropython-lib/python-stdlib/collections.defaultdict/test_defaultdict.py

from collections import defaultdict

d = defaultdict.defaultdict(lambda:42)
assert d[1] == 42
d[2] = 3
assert d[2] == 3
del d[1]
assert d[1] == 42

assert "foo" not in d
collections.defaultdict: Add implementation. In a namespace package. 2014-04-14 18:20:31 +00:00			`from collections import defaultdict`

collections.defaultdict: Fix test. 2014-05-22 22:16:30 +00:00			`d = defaultdict.defaultdict(lambda:42)`
collections.defaultdict: Add implementation. In a namespace package. 2014-04-14 18:20:31 +00:00			`assert d[1] == 42`
			`d[2] = 3`
			`assert d[2] == 3`
			`del d[1]`
			`assert d[1] == 42`
collections.defaultdict: Implement __contains__. Otherwise, "in" operation uses list protocol (enumeration using __getitem__, which adds a key/value pair to teh underlying dict) and ends with memory overflow. 2017-01-25 22:26:40 +00:00
			`assert "foo" not in d`