dict
β’ 251 words β’ 2 min β’ updated
python
if __name__ == "__main__":
d = {}
assert len(d) == 0
d["a"] = 1
d["b"] = 2
assert list(d.keys()) == ["a", "b"]
assert list(d.values()) == [1, 2]
assert list(d.items()) == [("a", 1), ("b", 2)]
del d["b"]
assert list(d.keys()) == ["a"]
assert list(d.values()) == [1]
assert list(d.items()) == [("a", 1)]
try:
del d["b"]
assert False
except Exception:
...
d2 = {
"c": 3
}
d.update(d2)
assert list(d.keys()) == ["a", "c"]
assert list(d.values()) == [1, 3]
assert list(d.items()) == [("a", 1), ("c", 3)]
assert "a" in d
assert 1 not in d
assert 1 in d.values()
assert "b" not in d
assert "c" in d
assert d2.keys() <= d.keys()
assert d2.keys() < d.keys()
assert d2.items() <= d.items()
assert d2.items() < d.items()
d2 |= d
assert d == d2
assert d is not d2
d2.clear()
assert not d2
assert d2.get('a', 'cc') == 'cc'
try:
assert d2.get('a')
assert False
except Exception:
...
assert 'a' in d
assert d.pop('a') == 1
assert 'a' not in d
d['a'] = 1
assert 'a' in d
assert d.popitem() == ('a', 1)
assert len(d) == 1
assert d.setdefault('a', 1)
assert 'a' in d
assert d['a'] == 1
del d['a']
d['a'] = 1
d['a'] = 2
assert d['a'] == 2
# insert only if not already present
del d['a']
d.setdefault('a', 1)
d.setdefault('a', 2)
assert d['a'] == 1
d.clear()
d['a'] = 1
a = {}
a.update(d)
assert a == d
a.clear()
a.update([('a', 1)])
assert a == d
assert list({chr(x): x for x in range(ord('a'), ord('a') + 26)}.items())[0] == (('a\
', 97))