Unverified50% confidenceSolutionExact time
When implementing snapshots in Python, a dataclass with frozen=True can be used to represent an immutable Memento object, and tuples rather than lists can be used to store mutable collections to ensure immutability.
1
Sources
50%
Confidence
Long-term
Relevance
10/9/2026
First Seen
Sources
Related Entities
Related Claims
UnverifiedPython 3.15 has a built-in immutable mapping, frozen dict, requiring no import, and raises a TypeError when modification is attempted.68% similarUnverifiedGenerators and iterators in Python are one-time data structures; iterating again after exhaustion yields no elements.64% similarUnverifiedPython 标准库的 dataclasses 模块使用 MISSING 哨兵，functools.reduce 内部实现也使用类似的哨兵机制63% similarUnverifiedPython's built-in ast module can parse source files and statically extract dependency information without actually executing the code.61% similarUnverifiedThe built-in frozenset has existed since Python 2.4.59% similar
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