Web Reference: May 9, 2009 · To check if a variable exists in the local scope in Python, you can use the locals() function, which returns a dictionary containing all local variables. You can modify your exists function to check both global and local scopes like this: Dec 1, 2025 · In this article, I’ll walk you through practical methods to check if a variable is defined in Python. Each method comes with clear explanations and full code examples you can use immediately in your Python Keras projects. Jul 15, 2025 · Checking if a Python variable exists means determining whether a variable has been defined or is available in the current scope. For example, if you try to access a variable that hasn't been assigned a value, Python will raise a NameError.
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