Dont quite understand this question. What does it mean by str upper class?

Hi Siu Chung Leung,

The question is more about how to use the "help" function in the python shell than about the details of the str.upper method. The correct answer is the following:

>>> help(str.upper)

You can use the help function in this way for all kinds of things. It will give you information on what methods are available and how to use them.

Regarding the details of the str class and it's methods, you'll learn more about classes in the object-oriented Python course. For the purposes of python basics, all you need to know is that all data types, like strings (str), integers (int), lists, etc., are objects and have certain methods specific to each type that can be called upon when you need them.

For example, the .upper() method will make all the letters in a string uppercase. But you wouldn't be able to use this method on an integer. You'd get an error if you tried.

>>> some_string = "This is a string"
>>> some_string.upper()
'THIS IS A STRING'

>>> var_1 = 5
>>> var_1.upper()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'int' object has no attribute 'upper'

Hope this clears things up.