Developing the get_tags() function

The get_tags() function, with the help of the PIL module, parses EXIF metadata tags from our JPEG image. On line 72, we create a list of headers for our CSV output. This list contains all of the possible keys that might be created in our EXIF dictionary in the order we want them to be displayed in a CSV file. As all JPEG images may not have the same or any embedded EXIF tags, we'll run into the scenario where some dictionaries have more tags than others. By supplying the writer with the list of ordered keys, we'll ensure that the fields are written in the appropriate order and columns:

062 def get_tags(filename):063     """064     The get_tags function extracts the EXIF metadata from the data065     object.066 :param ...

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