Hello Team,

Please, replace the comma symbol with the colon in the next sentence "There are two kinds of valid attribute names, data attributes and methods." in 9.3.3 paragraph.

link (actually it takes place in every version like 3.6, 3.8, etc.):
https://docs.python.org/3.7/tutorial/classes.html#instance-objects 

It is not a big mistake but confuses readers (especially not native speakers).

thank you!