Web Reference: Nov 24, 2025 · In this tutorial, I will walk you through the most reliable methods to check for Null or Empty variables, covering everything from basic strings to complex DataFrames. In this tutorial, you'll learn about the NoneType object None, which acts as the null in Python. This object represents emptiness, and you can use it to mark default parameters and even show when you have no result. There's no null in Python; instead there's None. As stated already, the most accurate way to test that something has been given None as a value is to use the isidentity operator, which tests that two variables refer to the same object.
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