[Tutor] What is the square brackets about?

[Ege Berkay Gülcan]

def get_(loc, thing):
    if loc==[]: return thing
    return get_(loc[1:], thing[loc[0]])

Hi I am new to Python and I would like to learn about these uses of square
brackets. I know that loc[1:] means loc list without the first element but
I do not know the meanings of loc==[] and thing[loc[0]].
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