Temperature units do not properly format as string

[wgxli]

degC, degF, and degR (along with their delta-equivalents) are not properly formatted in Unicode, HTML, or LaTeX.

[hgrecco]

We need to address this. Thanks for reporting

[eevleevs]

Possibly related? I got a

ValueError: Unknown format code g for object of type 'str'

when trying to cast a temperature to string.

Needed to change

mstr = format(obj.magnitude, mspec).replace("\n", "")

to

mstr = format(float(obj.magnitude), mspec).replace("\n", "")

in quantity.py, __format__() (ca. line 300) to make it work.

[invarianz]

I have also realized that the LaTeX conversions for some units are wrong.

Steps to reproduce:

import pint
test = pint.Unit('celsius')
print(f'{test:L}')
print(f'{test:Lx}')

Output

\mathrm{degree\_Celsius}
\si[]{\degree_Celsius}

In LaTeX this renders completely wrong. The expected output would be:

For :L

\mathrm{\degree_C} or

Or better for :Lx

\si[]{\celsius}

Thanks for looking into this!

[andrewgsavage]

a PR fixing this is welcomed