%= Modulo assignment
Last updated: 2026-09-22
%= Modulo assignment
%= takes the modulo of the left variable by the right value, equivalent to x = x % y.
| Category | Operators |
|---|---|
| Kind | Operator |
📝 Syntax
x %= y▶ Example
Edit the code, press Run, and see the result in the output panel:
Output：
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❓ FAQ
QAre x %= 2 and x = x % 2 the same?
AEquivalent (for immutable types). A common use is loop counters: `i %= n` keeps `i` within the range `[0, n)`.
QIs %= useful on strings?
AIt has historical usage: `s %= args` does `%`-formatting (e.g. `s %= (x, y)`). But f-strings are now recommended, and `%=` is basically unused for formatting.
QWhat happens with x %= 0?
AIt raises `ZeroDivisionError`. The divisor of a modulo operation cannot be 0, or the program errors out immediately.
