b''.hex() == ''

[GanerCodes]

Port, board and/or hardware

esp32

MicroPython version

MicroPython v1.28.0-preview.173.g97219553ed.dirty on 2026-02-11; ESP32 LightWave with ESP32LW

(99.99% sure master has this issue)

Reproduction

b''.hex()

Expected behaviour

''

Observed behaviour

b''

Additional Information

No response

Code of Conduct

Yes, I agree

[Josverl]

actually this reproduces on v1.27.0

# Windows standard
MicroPython v1.27.0 on 2025-12-18; win32 [GCC 12.0.0] version
Type "help()" for more information.
>>> b''.hex()
b''

# unix standard 
MicroPython v1.27.0 on 2025-12-18; linux [GCC 12.4.0] version
Type "help()" for more information.
>>> b''.hex()
b''

But that is indeed different from CPython

Python 3.11.9 (main, Aug 14 2024, 04:18:20) [MSC v.1929 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> b''.hex()
''

[dpgeorge]

Thanks for the report. PR #18808 fixes this issue.

[dpgeorge]

Fixed by 06bfefe