Web Reference: Sep 3, 2025 · Learn how to fix the Python error "NameError: name is not defined" with clear examples, causes, and solutions. Easy guide for beginners and professionals. The NameError: name '...' is not defined is one of Python's most fundamental errors. It occurs when you try to use a variable, function, class, or module that Python doesn't recognize in the current scope because it hasn't been defined, assigned a value, or imported correctly. Nov 17, 2014 · Your specific issue of NameError: name 'guess' is not defined is because guess is defined in your main function, but the while loop that it is failing on is outside of that function.
YouTube Excerpt: In this tutorial, learn how to tackle the infamous "NameError:
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