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behaviour of the modulo operator #129297

Closed as not planned
Closed as not planned
behaviour of the modulo operator#129297

Description

@SerpentByte
SerpentByte
opened on Jan 25, 2025

Feature or enhancement

Proposal:

The behaviour of the modulo operator should be made consistent across Python and C/C++.

3%2 # this is 1
-3%2 # this can be represented as -1 or 1 depending of the divisor.
# -3%2 is -1 in C/C++.

Has this already been discussed elsewhere?

I don't think so.

Activity

  1. SerpentByte
    added
    type-featureA feature request or enhancement
    on Jan 25, 2025

  2. sobolevn commented on Jan 25, 2025

    @sobolevn
    sobolevn
    on Jan 25, 2025
    Member

    Looks like a duplicate of #75204

  3. ronaldoussoren commented on Jan 25, 2025

    @ronaldoussoren
    ronaldoussoren
    on Jan 25, 2025
    Contributor

    The behaviour of the operator is intentional, see the answers in this stack overflow question for a good explanation of the rationale for this choice.

  4. ronaldoussoren
    closed this as not plannedon Jan 25, 2025
  5. Eclips4
    removed
    type-featureA feature request or enhancement
    on Jan 25, 2025

  6. terryjreedy commented on Jan 26, 2025

    @terryjreedy
    terryjreedy
    on Jan 26, 2025
    Member

    Issue #75204 is not really a duplicate; it is an open proposal to revise the int division programming FAQ, which involves the choice of modulus sign determination. I just opened PR #129313 for it. It needs coredev review.

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