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Cleaning and Preparing Data in Python def statements

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My Code:

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What I expected to happen:

What actually happened:

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I understand the code but my question is if we just want to strip off unwanted characters and calculate the average age we can just write two definitions and use the def within the moma dataset looping and update the list. What is the reason for creating two new lists?

hi @maungkhantdelica

If you are still looking for this topic, can you please elaborate on your question? I can’t understand which two definitions and which two lists?