'module' object has no attribute 'EPIPE'

[LUCKandII]

Hi, I have questions about using this library errno,

• I can import this library errno,but how do I know how the error flags correspond to the numbers? I refer to the source code here: python-stdlib/errno/errno.py but found a problem:

>>> import errno
>>> errno.ETIMEDOUT
116
>>> errno.EINPROGRESS
119
>>> errno.EPIPE
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'module' object has no attribute 'EPIPE'

• But in errno.py, errno.ETIMEDOUT should be 110, errno.EINPROGRESS should be 115, errno.EPIPE should be 32. Did I refer to the wrong source code?

This problem will affect the porting and development of some libraries especially using errno.EPIPE and I am confuse. I 'd love to know where the exact source code is.

• hardware: ESP32 / WROOM
• micropython version: ESP32_GENERIC-20230426-v1.20.0.bin

[andrewleech]

Again, there's a builtin version of errno as well as the micropython-lib copy: https://github.com/micropython/micropython/blob/a3862e726728725248d42ea9173675d523c13911/py/moderrno.c#L38

[LUCKandII]

@andrewleech Thanks! I guess I understand:

• In this folder micropython\ports\esp32, there is no such a file named moderrno.c nor MICROPY_PY_ERRNO_LIST defined in micropython\ports\esp32\mpconfigport.h, so we should refer to micropython\py\moderrno.c and the MICROPY_PY_ERRNO_LIST in it. So the errno.EPIPE code is NOT included.
• As for ERRNO numbers, referring to the file micropython\ports\esp32\mpconfigport.h, here has explained errno.h source code for ESP32. To find the answer, just download ESP-IDF and look into xtensa-esp32-elf/sys-include/sys
• As for micropython feature and libraries, sitll referring to the file micropython\ports\esp32\mpconfigport.h, it clearly illustrates which libraries are from port and from extmod