int.bit_count() Count set bits
Last updated: 2026-09-22
int.bit_count() Count set bits
int.bit_count() returns the number of ones in the binary representation (3.10+).
| Category | Number Methods |
|---|---|
| Kind | Built-in Type Method |
| Python Version | all |
📝 Syntax
int.bit_count()Returns：int. The number of ones in the binary representation (3.10+).
Mutates the original：No (returns a new object)
▶ Example
Edit the code, press Run, and see the result in the output panel:
Output：
3
8💡 Related Cases
More case studies coming soon — check back later.
❓ FAQ
QWhat does bit_count() return?
AThe number of 1s in the integer's binary representation (also called population count). For example, 7 in binary is 111, so it returns 3.
QWhat Python version is required?
APython 3.10+.
QHow are negative numbers computed?
AThey are counted by the binary of the absolute value: (-1).bit_count() returns 1, the same as 1.
QWhat are common use cases?
ACounting set bits, computing Hamming distance, and other bit operations.
