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exiftool allows appending to a repeatable list of tags, for example Image Creator (dc:creator). This functionality also works through pyexiftool:

Code Block
% python
>>> from exiftool ' import ExifToolHelper
>>> with ExifToolHelper() as et:
...     et.execute("-XMP-dc:creator+=New Creator' Jane Smith","test-image.jpg")
  '1 image files updated\n'
% exiftool -XMP-dc:creator test-image.jpg         
Creator                         : CreatorJohn 1Smith, Creator 2, New CreatorJane Smith

Would you like more examples? Just ask!