bin() Integer to binary string
Last updated: 2026-09-22
bin() Integer to binary string
bin() converts an integer to a binary string prefixed with '0b'.
| Category | Built-in Functions |
|---|---|
| Kind | Built-in Function |
| Python Version | all |
📝 Syntax
bin(x)⚙️ Parameters
| x Required | An integer to convert. |
|---|
Returns：str. A binary string prefixed with '0b'; '-0b' for negative numbers.
💥 Raises
TypeError— Raised when x is not an integer.
▶ Example
Edit the code, press Run, and see the result in the output panel:
Output：
0b1010
-0b1010
0b0🏷️ Related Built-in Functions
💡 Related Cases
More case studies coming soon — check back later.
❓ FAQ
Qbin() returns a string with a 0b prefix — how do I remove it?
ASlice it off with bin(10)[2:], or use format(10, 'b') directly to get '1010' without the prefix.
QWhat does bin(-10) return?
AIt returns '-0b1010' — the minus sign comes before the 0b prefix; bin() does not produce a two's-complement representation.
QWhat is the difference between bin() and format(x, '08b')?
Abin() always includes the 0b prefix and cannot zero-pad; format(255, '08b') returns an 8-digit, zero-padded value with no prefix, which is better for fixed-width output.
QDoes bin(3.5) work?
ANo. bin() only accepts integers (or objects implementing __index__); passing a float raises a TypeError.
