<<= Left shift assignment
Last updated: 2026-09-22
<<= Left shift assignment
<<= shifts the bits of the left variable left by the amount of 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：
8💡 Related Cases
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❓ FAQ
QWhat does x <<= 3 equal?
AIt multiplies `x` by 8: with `x = 1; x <<= 3`, `x == 8`, equivalent to `x = x << 3`, i.e. `x * 2**3`.
QWhat happens if n in x <<= n is negative?
AIt raises `ValueError: negative shift count`. Left shift does not allow a negative count; `n` must be an integer.
QIs left-shift assignment faster than multiplication assignment?
ABit operations are usually slightly faster, but the difference is generally negligible. Choose by readability and do not sacrifice clarity for such a tiny performance gain.
