NameError when attempting to sort pandas DataFrame column

like @ewokx said, trip_distance by itself means nothing to Python, it doesn't know that's a column inside your dataframe. You always have to reference it through the dataframe.

And also sorted() is not really the way to go with pandas, for that you use sort_values()

here sort the whole dataframe by that column descending.

or if you only want that column i would go like this below:

just replace df with whatever your dataframe is actually called in your code and your good.