[Python] How to access the release-date or -year from an MP3 file with eyed3 in Python

I'm trying to access some MP3 tags like the album release year. It is stored in the id3v2 tags under TYER.

My platform is Windows 10 Pro.

I found out that attributes like track_num are located in

class eyed3.core.Tag

Then the python command looks like this:

audiofile = eyed3.load(mp3_file)
track_num = audiofile.tag.track_num[0]


Now the year is located in

class eyed3.core.Date(year,...)

So I thought that would be:

year = audiofile.date.year

But I'm unfortunately wrong. I got an error:

AttributeError: 'Mp3AudioFile' object has no attribute 'date'
​

Does anyone know how to get the release-date or release-year?

Or, a more generic question: How can I get all of the available attributes?

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