frozendict_quickstart_immutable_dict_operations_and_modification.py

1from frozendict import frozendict
2
3fd = frozendict({"a": 1, "b": 2})
4
5print(fd["a"])
6# output: 1
7
8print(len(fd))
9# output: 2
10
11print(fd.get("c", 3))
12# output: 3
13
14print("a" in fd)
15# output: True
16
17# This will raise a TypeError:
18# fd["a"] = 3
19
20# This will also raise a TypeError:
21# fd.update({"c": 4})
22
23# You can create a new frozendict from an old one
24fd2 = fd.set("c", 4)
25print(fd2)
26# output: frozendict({'a': 1, 'b': 2, 'c': 4})
27
28fd3 = fd.delete("a")
29print(fd3)
30# output: frozendict({'b': 2})