How do I import a list of values into a dictionary?

I have a long list of values that I'd like to import in, but I have no idea how to do it. I want it to import into a dictionary. For example, if I had a list like this:

123

321

213

And I wanted to import it into a dictionary like this:

Key: 1 | Value: 123

Key: 2 | Value: 321

Key: 3 | Value: 213

I want to be able just put in the list and it do it for me, the list is here:

adventofcode.com/2020/day/1/input

Thanks!