IdfTag.__str__() returns a list

[cornellwrightjr]

With a certain .jpg file,the str method of IdfTag returns a list of values. This causes an exception when I attempt to print the value of an EXIF tag. A short recreation program is attached along with the .jpg file causing the problem.

I can work around this problem very easily by replacing str(value) with str(value.str()), so nothing urgent from my point of view. Additionally, I'd be happy to have a go at providing a fix if you would be interested in taking it. I suspect the problem is in the bottom of the _process_tag method in classes.py after the comment <# compute printable version of values>.

This occurred on MacOS 11.2.3 running ExifRead 2.9.2 installed via pip and Python 3.9.2 installed via homebrew.

Here's the output from the recreation program showing the problem.

====> val.str() returns non-string <====
tag: MakerNote SpecialMode
type(val): <class 'exifread.classes.IfdTag'>
val.str(): [2290028546, 2317605138, 3584621556]
type(val.str()): <class 'list'>
len(val.str()) 3
val.str()[0] 2290028546
val.str()[1] 2317605138
val.str()[2] 3584621556
tag: MakerNote SpecialMode val: Traceback (most recent call last):
File "/Users/cornell/shr/pgm/jpeg-date-name/./bug-demo.py", line 21, in
print('tag:', tag, 'val:', val)
TypeError: str returned non-string (type list)
bug-demo.zip