AttributeError: 'NoneType' object has no attribute 'func'

[nick-0307]

When I import multiprocessing, there is an error saying that:
File "main.py", line 5, in
File "multiprocessing.py", line 3, in
File "select.py", line 14, in
AttributeError: 'NoneType' object has no attribute 'func'

Would you please help me solve this problem?

[kitplummer]

I get the same with the base64 module:

>>> %Run -c $EDITOR_CONTENT
Traceback (most recent call last):
  File "<stdin>", line 7, in <module>
  File "/lib/base64.py", line 9, in <module>
  File "/lib/re.py", line 11, in <module>
AttributeError: 'NoneType' object has no attribute 'func'

[andrewleech]

In both cases here the ffi modules for select and re respectively have been installed, but they can't find the referenced dynamic libraries.

@kitplummer if you see re.py", line 11, in

micropython-lib/unix-ffi/re/re.py

Line 11 in f3cfc52

pcre_compile = pcre.func("p", "pcre_compile", "sipps")

it's clear pcre is None meaning the ffi command earlier couldn't find it

micropython-lib/unix-ffi/re/re.py

Line 6 in f3cfc52

pcre = ffilib.open("libpcre")

[andrewleech]

@jimmo would it make most sense for ffilib.open() raise an exception if it can't find the library?

[kitplummer]

@andrewleech - thanks, eventually dug in enough to find that being the issue.

I'm working with a Raspberry Pico W, which apparently doesn't have the lib. :) Working around it now, but that might be worth adding to make it obviously clear.

[andrewleech]

Ah yes, the ffi based libs only work on Linux.

How did you install these libraries out of interest?

This repo is in the process of being reorganised a bit with the recent manifest file charges, working towards making library compatibility and installation easier and more reliable.

[kitplummer]

I installed with upip.

[kitplummer]

For posterity, I was trying to use urllib.parse for urlencode purposes - which pulls in micropython-re-pcre (and the ffilib dep) by default.

[andrewleech]

Ah thanks, that context definitely helps! urllib.parse is definitely something I can see as useful on rpi-w / networked boards, it'd be worth updating it to work with the built-in re module.

[kitplummer]

Should've mentioned, the quick-fix for me was to simply delete the re.py and ffilib.py files from the Pico's lib/ subdir - and using the built-in stuff.

[jonnor]

There seems to have been a fix/clarification provided. Proposing to close this issue.