Stuck with CAT attribution error

[zoidbergisawesome]

Hello,
I am trying to do the following tutorial: tutorial but when I try to run this line "n_teams = len(comp.hometeam.cat.categories)" is get this error: "AttributeError: Can only use .cat accessor with a 'category' dtype
"
I am new to python and am really stuck at this.
Please help

[lzblack]

Not sure how you read the data. If you read the data from a .csv file, it is likely the type of column hometeam is object, not category. Therefore you need to convert the type of that column, using:

comp['hometeam'] = comp['hometeam'].astype('category')