Name Error Python Not Defined

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A NameError is raised when you try to use a variable or a function name that is not valid In Python code runs from top to bottom This means that you cannot declare a variable after you try to use it in your code Python would not know what you wanted the variable to do The most common NameError looks like this . .

The solution to this problem is to invoke your classes and functions after you define them Python does not have any way to forward declare classes or methods so the only option is to put the invocations of functions at In Python, a NameError: name 'x' is not defined error is raised when the program attempts to access or use a variable that has not been defined or assigned a value. This can happen if the variable is spelled incorrectly, or if it is accessed before it has been defined. What Causes Undefined Variable

Name Error Python Not DefinedIt is interpreting python as a name of a variable, and that name is not defined. Try this instead and you should hopefully see that your Python installation is working as expected: print ("Hello world!") Share. 3 Answers 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 Your indention is entirely wrong for this application