How to set default formatter to never use scientific notation using pretty formatter?

[MattTheCuber]

I am using my formatter with ureg.default_format = "~P" at the formatter. This works well, but very small numbers are formatted using scientific notation which is not my preference (e.g. 3.410605131648481×10⁻¹³ ft/s should be "0.00000000000034106 ft/s").

[hgrecco]

With the new formatter delegate, it is much easier to write your own and swap it. The docs are not ready yet, but you can check the https://github.com/hgrecco/pint/blob/master/pint/delegates/formatter/plain.py and https://pint.readthedocs.io/en/develop/user/formatting.html#custom-formats

[MattTheCuber]

Hmm, I might take the pretty formatter to customize to get this behavior once its released...

[keewis]

for something much simpler than a custom formatter (which do give you a lot of power, but might be overkill here – depends on what you want), you could just use the f formatter of standard python floats with a fixed width. For example: .10f~P

[MattTheCuber]

That could work, but for our case I don't want is print many decimals when not necessary (which is the default behavior).

P.S. print(ureg.Quantity("0.00000000000034106 ft/s")) with 10 decimals prints 0.0000000000 ft/s

P.S. 2, this might be a bug currently. I tried setting the default_format to .10f~P, and then .10fP, .5f, and many other combinations. But none of them seem to remove the scientific notation. In fact, I tried is with much simpler numbers and nothing seems to be working to use anything with .Xf.
cc @hgrecco
Nevermind, I was using __repr__ instead of __str__ or something because it was in a jupyter notebook.