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We defined this function in the previous lectures,

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which is able to calculate the mean of a list.

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However, what happens if instead of passing a list

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as inputs, we pass a dictionary, so student_grades

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is the dictionary here. Let's see what's going to happen.

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[Author typing]

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Well, it says an unsupported operand type.

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So an error will occur with the sum function

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because it will try to add up strings and

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integers, and this function is not designed to

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process dictionaries. It's designed to process

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lists. So how can we make this function to process

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both lists and dictionaries? We can do that using

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conditionals. Let's see how to do that in the next videos.

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[Outro sound]