No trailing zeros?

[kenkundert]

No trailing zeros?

[KenKundert]

That was not supported, but it seems like a good idea so I have added it. You can get the new feature by updating from github (the feature is not in pypi yet so 'pip install' will not do it). There is a new preference, strip_zeros. If you set it False, the trailing zeros will not be removed:

Quantity.set_prefs(strip_zeros=True)
Fhy = Quantity('1.0000 MHz')
print(Fhy.render(prec=5))

1 MHz

Quantity.set_prefs(strip_zeros=False)
Fhy = Quantity('1.0000 MHz')
print(Fhy.render(prec=5))

1.00000 MHz

[KenKundert]

Oh, and a precision of 5 results in 6 digits being displayed. This seemingly odd choice is modeled after the behavior of scientific calculators.

[ulthiel]

Awesome, cheers! Big up for your work!

[KenKundert]

Thanks!

[hmijail]

Found this issue while trying to make the # modifier work (I couldn't):

>>> r = Quantity(123000)
>>> f"{r:#.4}"
'123k'
>>> Quantity.set_prefs(strip_zeros=False)
>>> f"{r:#.4}"
'123.00k'

Is this a bug or am I misunderstanding something?

This is in Quantiphy 2.19 on Python 3.12.2.

[KenKundert]

What were you expecting?

[hmijail]

Well, the docs say:

The hash (#) is a literal hash that when present indicates that trailing zeros and radix should not be stripped from the fractional part of the number.

Sounds like the # is supposed to be equivalent to (strip_zeros=False)? And no other format modifier sounds close to that purpose.

Plus, # doesn't seem to do anything, which again sounds like maybe a bug?

>>> from quantiphy import Quantity
>>> r = Quantity(123000)
>>> f"{r:#.4}"
'123k'
>>> f"{r:.4}"
'123k'
>>> Quantity.set_prefs(strip_zeros=False)
>>> f"{r:#.4}"
'123.00k'
>>> f"{r:.4}"
'123.00k'

[KenKundert]

Okay, sorry about that. I was looking at the wrong number. I found and fixed the problem and have updated the github version. Might take me a while to update the pypi version.

>>> from quantiphy import Quantity
>>> r = Quantity(123000)
>>> f"{r:#.4}"
'123.00k'
>>> f"{r:.4}"
'123k'
>>> Quantity.set_prefs(strip_zeros=False)
>>> f"{r:#.4}"
'123.00k'
>>> f"{r:.4}"
'123k'

[hmijail]

Maybe I'm being dense, but... shouldn't f"{r:.4}" reflect the preference, and therefore show the zeros in the last case?

[KenKundert]

No, I'm the one being dense. I have fixed this issue as well.

>>> from quantiphy import Quantity
>>> r = Quantity(123000)
>>> f"{r:#.4}"
'123.00k'
>>> f"{r:.4}"
'123k'
>>> Quantity.set_prefs(strip_zeros=False)
>>> f"{r:#.4}"
'123.00k'
>>> f"{r:.4}"
'123.00k'

Thanks!