How can I check for NaN values?

You can use the isnan() function provided by the math module to check if a value is NaN.

Here's an example:

Check for NaN values in Python, using the isnan method

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You can also call math.isnan() directly on any numeric variable.

Check for NaN values in Python, using the isnan method as a standalone function

You can also use the math.isnan() function to check for NaN values in a list or array.

Check for NaN values inside an array in Python, using the isnan method

Note that math.isnan() only accepts numeric types. Passing non-numeric types (like strings or lists) raises a TypeError. To safely check for NaN in mixed-type collections, verify the type first using isinstance() before calling math.isnan().

Check for NaN values inside an array in Python, using the isnan method along with the isinstance function