Possibility to disable automatic conversion of units ?

[raphaeljolivet]

Is it possible to disable automatic conversion of units and fail when operation require changing the scale of the quantity ?

I am currently integrating this awesome library into lca_algebraic and would like the option to provide a "strict" mode, forcing users to convert quantities explicitely.

In practice, when this option is set, the following code should fail :

1 * u.ton + 1*u.kg

The user should do :

(1 * u.ton).to(u.kg) + 1*u.kg

Thanks in advance for your help.

[hgrecco]

There is no way to do that now, but it is an interesting idea and I do see the potential. You want to force the user to choose the units. Not sure if this can be done without a performance hit.

[raphaeljolivet]

Hi,

I've just implemented it there : master...raphaeljolivet:pint:feature/strict_mode

I added an auto_scale argument to the UnitRegistry (True by default)

In the _add_sub method, I check it and raise an exception in case auto_scale is False and the scaling of the other argument is required.

It is quite simple and suits my needs.
I have not implemented more complex cases when the self argument is scaled, and I am not sure to understand when this happens.

I have not made a proper PR yet.
I can do it if you find it useful.
Let me know.

And thanks for this really great library !

Regards,
Raphael