Can't convert an INT to lower()

[mixographer]

in the menu i select a podcast by number, and get:

Traceback (most recent call last):
File "/usr/local/bin/podcast", line 9, in
load_entry_point('podcast-player==1.4.0', 'console_scripts', 'podcast')()
File "/Library/Python/2.7/site-packages/podcast_player/cli.py", line 286, in main
podcast_menu()
File "/Library/Python/2.7/site-packages/podcast_player/cli.py", line 246, in podcast_menu
choice = handle_choice()
File "/Library/Python/2.7/site-packages/podcast_player/cli.py", line 126, in handle_choice
choice = choice.lower()

[mixographer]

It looks like python3 is required and I accidentally used 2.7.