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Read image metadata in Python

Install iptcinfo package:
easy_install iptcinfo

Reading
from iptcinfo import IPTCInfo
info = IPTCInfo('test.jpg')
print info.keywords, info.supplementalCategories, info.contacts
caption = info.data['caption/abstract']

Add/Edit
info = IPTCInfo('test.jpg')
info.data['caption/abstract'] = 'Witty caption here'
info.data['supplemental category'] = ['portrait']
info.save()
info.saveAs('test_out.jpg')  # keep original safe


But this will not read arbitrary tags, like exiftool will
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