Save unit registry to file

[tartieret]

As it is possible to load unit definitions from a file, would it be possible to add a "save_as_file" function? This would allow to create units dynamically and save them on disk for re-use later ?

[hgrecco]

That is not possible but there was also an idea to support a user configurable unit definition list that is stored in the home directory and loaded automatically upon start. I do not know if there is really a demand for this.

[varenc]

I'd be interesting in something like this to speed up loading all the unit definitions. Profiling on my system, just loading the definition takes about 700ms, mostly parsing/tokenzing, and then using the definitions to do a single unit version takes the other 50ms. I tried just pickling the UnitRegistry but no luck.

[hgrecco]

I should be possible to create a cache file by pickling the internal dictionaries and load them if the definition files have not changed.