Unverified50% confidenceFactExact time
CPython 对小整数（通常是 -5 到 256）和短字符串有缓存优化（interning），导致 a=256;b=256;a is b 返回 True
1
Sources
50%
Confidence
Long-term
Relevance
8/13/2026
First Seen
Sources
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