The ImageFileReader class has a HasMetaDataKey() boolean function. So you should be able to do something like this:
meta = {
"a": reader.GetMetaData('0') if reader.HasMetaDataKey('0') else 'undefined',
"b": reader.GetMetaData('1') if reader.HasMetaDataKey('1') else 'undefined',
"c": reader.GetMetaData('2') if reader.HasMetaDataKey('2') else 'undefined',
}
And also, you could do in one (long) line:
meta = {m: reader.GetMetaData(k) if reader.HasMetaDataKey(k) else 'undefined'
for m, k in zip(['a', 'b', 'c'], ['0', '1', '2'])}
If you are a beginner then do learn python from scratch.
