Why do small integers often appear to have the same id in Python sessions?

Problem Statement

Explanation

Implementations like CPython cache a range of small integers to reduce allocations. This makes repeated small numbers share the same identity. It is an implementation detail, not a language guarantee. Do not rely on it for program logic.

Code Solution

SolutionRead Only

a=5; b=5
print(id(a)==id(b))  # often True

Practice Sets

This question appears in the following practice sets:

Memory, Copying & Performance

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Why do small integers often appear to have the same id in Python sessions?

Problem Statement

Explanation

Code Solution

Practice Sets

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Why do small integers often appear to have the same id in Python sessions?

Problem Statement

Explanation

Code Solution

Practice Sets

Related Questions

Is Python compiled, interpreted, or both?

Which of these joins two lists to make one new list?

Which loop runs until a condition becomes false?

Which method gives the floor value of a float?

In Python, what is the difference between '/' and '//'?

More from Python

Master Interviews
Anywhere, Anytime