object is not subscriptable... Error Message?

[Shafla]

thank you for the link. I have reviewed and am unable to find the details i am looking for. I am following an exercise in a book called Automate the boring stuff. i am following the exercise exactly and typing the following code

>>> import openpyxl
>>> wb=openpyxl.load_workbook('Example_Page267.xlsx')
>>> sheet=wb.active
>>> sheet.columns[1]

the output the book is saying i should get is

(<cell Sheet1.B1>,<cell Sheet1.B2>,<cell Sheet1.B3>,<cell Sheet1.B4>,<cell Sheet1.B5>,<cell Sheet1.B4>,<cell Sheet1.B5>,<cell Sheet1.B6>,<cell Sheet1.B7>)

but instead i am getting the error message

Traceback (most recent call last):
  File "<pyshell#160>", line 1, in <module>
    sheet.columns[1]
TypeError: 'generator' object is not subscriptable

could you give me an example of the code i should be inputting to get that output?