|= Bitwise OR assignment
Last updated: 2026-09-22
|= Bitwise OR assignment
|= computes a bitwise OR of the left variable with 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：
7💡 Related Cases
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❓ FAQ
QWhat does s |= {1} do to a set?
AIn-place union, equivalent to `s.update({1})`. For a dict (3.9+), it merges in place: `d |= {'k': 1}` writes that key-value pair into `d`.
QWhat is the difference between |= and or?
A`|=` is an augmented assignment operator, equivalent to `x = x | y` (bitwise OR); `or` is boolean logic. With `x = 4; x |= 3`, `x == 7`.
QMust the left side of |= be a variable?
AYes. Augmented assignment requires the left side to be a name, attribute, or subscript expression, not a literal: `3 |= 1` raises a syntax error.
