Python's Integer Interning Trap: Why 'is' Lies Above 256
Python's Integer Interning Trap
a = 256 b = 256 print(a is b) # True x = 257 y = 257 print(x is y) # False (in REPL!) ⚡ The Small Integer Cache
CPython allocates a fixed table of integer objects spanning [-5, 256] during interpreter initialization.
Because integers are immutable, caching frequently used numbers saves massive memory overhead.
Read the full breakdown on Binary Dose.
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