How to read camera make and model with GExiv2 in Python

Question

I'm totally new to GExiv2 or GObject introspection, but managed to figure out how to read the date of the image:

from gi.repository import GExiv2

def get_exif_data(filename='DSCN3025.JPG'):
    exif = GExiv2.Metadata(filename)
    print exif['Exif.Photo.DateTimeOriginal']

Next I would want the camera make and model, but

print exif['Exif.Photo.Make']

gives me "KeyError: 'Exif.Photo.Make: Unknown tag'"

Help is very much appreciated here, or can someone point out the documentation for understanding the GObject Metadata model. What should I do to get a list of the available tags?

Answer 1

To expand what's posted in comments, the get_tags() function will return a list of the tags in the metadata. So you can do, for example:

exif = GExiv2.Metadata(testfile)
if 'Exif.Photo.Make' in exif.get_tags():
    print exif['Exif.Photo.Make']