Need gradebook .remove help Step 8

Data Science
1

https://www.codecademy.com/courses/learn-python-3/projects/python-gradebook

The instructions are: " Find the grade value in your gradebook for your poetry class and use the .remove() method to delete it."

My code: gradebook.remove(gradebook[2]) ← current code, as suggested.

This removes both items inside the square brackets. It’s easy enough to replace them but the instructions seem to suggest removing only the second item - the “grade value.” I’ve searched and tried to remove, delete and pop but get errors. The suggested code has me removing the entire thing.

Could someone offer some direction here?

2

gradebook[2] is a list. The above line could be expected to remove the entire item from the grade book, not just the value, 85, as the instruction suggests.

Since we know that gradebook[2] is in fact a list, then we can use the .remove() method that it has to remove the value suggested.

3

But that removes both elements, right? I think the instructions want me to remove only one of the elements.

4

Yes, one element from an inside element.

a = [
    ['a', 90],
    ['b', 95],
    ['c', 85],
    ['d', 80]
]

Now consider,

>>> a.remove(a[2])
>>> a
    [['a', 90], ['b', 95], ['d', 80]]
>>>

The .remove() method is in the execution context of a, a list class object with that attribute present.

>>> hasattr(a, 'remove')
    True
>>>

Now consider,

>>> hasattr(a[1], 'remove')
    True
>>> a[1].remove(95)
>>> a
    [['a', 90], ['b'], ['d', 80]]
>>>

This time the .remove() method is in the execution context of a[1].

Each object has its own attributes, and each method is in the context of the object. Methods are not global functions, but tied directly to the object that owns them.

3 Likes
5

Thank you so much. That’s what I was looking for.

1 Like