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This function returns the mean value of a list, but we want to make it more intelligence.

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We want the function to return to the mean even if the input value is a dictionary.

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So when the input value is a list it will going to apply a specific algorithm and return the specific

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value which is the mean of a list. When it's a dictionary

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it's going to check if it's a dictionary and apply the corresponding algorithm that calculates the mean

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value of a dictionary.

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So we know that

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sum(monday_temperatures) divided by length of monday_temperatures gives you the mean of the list.

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Similarly student grades which is a dictionary, it's values, the sum of its values divided by the length

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of student grades dictionary will give you that mean.

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So we want our function to check and make a decision.

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This is a parameter.

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Let me change it to value.

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Value is a more meaningful name since what we are processing we will not only be a list but it can

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also be a dictionary.

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And then under the function everything has to be indented.

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You can see the whole body of the function is indented.

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So the conditional block that I'm going to write here is also going to be indented.

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It starts with if. If you remember we used a type function earlier in the course which returned the type

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of an object.

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For example this is a dictionary, an empty one, but it's still a dictionary.

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So what you can do here is you can say if type value.

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Double assignment operator which means equal.

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It's a comparison operator.

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It checks equality. If that is a dict, a column, enter and it has to be indented with four spaces.

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So you see it's another level of indentation it's one here for if, and this is for the function, so here

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the mean will be equal to sum of value

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dot values

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divided by the length of value.

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So this is a dictionary dict.values and length of the dictionary.

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I have to close the sum function call there like that and enter.

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If you are done with

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the if block,

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so if that's all what you want to check then you say else

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and we have this code which has to be indented under else as well and that's it.

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Let me try this. So with student grades, the dictionary as input

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we got these value here.

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If I used

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the list

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monday_temperatures it's going to give me the other value which is the meaning of the Monday temperatures.

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So that's an if and else conditional.

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But let me explain it line by line in the next video.