Can matplotlib add metadata to saved figures?

Question

I want to be able to ascertain the provenance of the figures I create using matplotlib, i.e. to know which version of my code and data created these figures. (See this essay for

Answer 1

As of matplotlib version 2.1.0, the savefig command accepts the keyword argument metadata. You pass in a dictionary with string key/value pairs to be saved.

This only fully works with certain the 'agg' backend for PNG files.

For PDF and PS files you can use a pre-defined list of tags.