Conversion from string

[PetteriAimonen]

Thanks for the cool library!
It would be nice to have a function that can parse a PhysicalQuantity from a string.

For usage outside ipython, it would be nice if this was available under a short name, such as the already existing q().

A quick mock-up which just splits at whitespace:

from PhysicalQuantities import PhysicalQuantity, _Quantity, q
_Quantity.__call__ = lambda s, x: PhysicalQuantity(float(x.split()[0]), x.split()[1])
print(q("1 m") / q("1 s"))  # gives 1.0 m/s

It would also be useful for parsing string data loaded from files or input by user.

[juhasch]

Thanks for your interest :-)
You can use transform_line from PhysicalQuantities.transform to do this, see:
I use this here for example:
https://github.com/juhasch/yamleins/blob/master/yamleins/__init__.py

[PetteriAimonen]

Yeah, though that requires eval() which is quite risky when loading untrusted files.