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We defined this function in the previous lectures which is able to calculate the mean of a list.

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However what happens if instead of passing a list
as input we passed a dictionary so student grades

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is this dictionary here.

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Let's see what's going to happen.

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Well it says an unsupported operand type, so an error will occur with the sum function because it will

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try to add up strings and integers and this function is not designed to process dictionaries.

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It is designed to process list.

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So how can we make this function to process both lists and dictionaries?

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We can do that using conditionals.

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