mainsail.cfg unicode symbol issue

[UserDmitry]

Klipper report an issue "Unable to open *path*\mainsail.cfg file". In klippy.log there is a error:
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc2 in position 7558: ordinal not in range(128)
Config error
Traceback (most recent call last):
File "/home/sapphire/klipper/klippy/configfile.py", line 159, in _read_config_file
data = f.read()
File "/home/sapphire/klippy-env/lib/python3.6/encodings/ascii.py", line 26, in decode
return codecs.ascii_decode(input, self.errors)[0]
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc2 in position 7558: ordinal not in range(128)

This byte appears at str. number 137:
# we need to use the unicode (\u00B0) for the ° as py2 env's would throw an error otherwise

Unicode symbol in this comment " ° " cause this error.

[pedrolamas]

I've tried to reproduce this issue on a Docker container running Python 2.7.18 and it worked fine...

@UserDmitry can you please upload a full klippy.log so we can check the issue directly?

[UserDmitry]

Yes, of course.
klippy.log

[pedrolamas]

Looking at the log I can see Klipper is using python 3.6.9, so that might be the problem as AFAIK, unicode support was added in 3.9.

Nevertheless, I do think we should fix this issue here as it is such a trivial fix.

@zellneralex any comments on this?

[zellneralex]

I really love it, I am only adding that comment so that people understand the cryptic Unicode usage here. I will change the comment in the next days.

Currently I am on a business trip.