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Pandas: Count number of non-NaN entries

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The count() method returns the number of non-NaN values in each column. Similarly, count(axis=1) returns the number of non-NaN values in each row.

CompSci: GUIDs are not strings

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GUIDs are not strings. They are numbers. We render them as strings for readability. We should not process them as strings. We should not pass them around ...

AWS CLI: List account aliases

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If you want the URL for your sign-in page to contain your company name (or other friendly identifier) instead of your AWS account ID, you can create an al...