TypeError: list indices must be integers or slices, not str

I am trying to do this tutorial (https://analyticsindiamag.com/a-hands-on-guide-to-automatic-music-generation-using-rnn/). I have fixed every error up until the actual creation of the first tensor.I run this code:

filenames = glob.glob(str(pathlib.Path('/content/maestro-v2.0.0/')/'**/*.mid*')) all_notes = [] for f in filenames[:5]: notes = midi_to_df(f) all_notes.append(notes) notes_df = pd.concat(all_notes) key_order = ['pitch', 'step', 'duration'] train_notes = np.stack([all_notes[key] for key in key_order], axis=1) notes_ds = tf.data.Dataset.from_tensor_slices(train_notes) notes_ds.element_spec 

Then get this error:

 Traceback (most recent call last) <ipython-input-70-eeb27cd23560> in <module>() 13 notes_df = pd.concat(all_notes) 14 key_order = ['pitch', 'step', 'duration'] ---> 15 train_notes = np.array([all_notes[key] for key in key_order], axis=1) 16 notes_ds = tf.data.Dataset.from_tensor_slices(train_notes) 17 notes_ds.element_spec <ipython-input-70-eeb27cd23560> in <listcomp>(.0) 13 notes_df = pd.concat(all_notes) 14 key_order = ['pitch', 'step', 'duration'] ---> 15 train_notes = np.array([all_notes[key] for key in key_order], axis=1) 16 notes_ds = tf.data.Dataset.from_tensor_slices(train_notes) 17 notes_ds.element_spec TypeError: list indices must be integers or slices, not str 

Any help would be appreciated. I’ve spent the last two weeks going through every tutorial I can find and it feels like literally not a single one works without an error every five lines that takes me two hours to research how to fix, some are easy, but all of them lead to something I can’t figure out, and I give up. I am determined to get one of these to work. And this one seems to simple but ofc I’ve reached a point I can’t figure out. PLEASE help me out here. thank you