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Showing content from https://www.w3schools.com/python/ref_exception_nameerror.asp below:

Python NameError Exception

Example

You get a NameError if you use a variable that does not exist:

print(x)

Try it Yourself » Definition and Usage

The NameError exception occurs if you use a variable that is not defined.

You can handle the NameError in a try...except statement, see the example below.

Exception Handling Example

Handling the NameError in a try...except statement:

try:
print(x)
except NameError:
print("Variable x is not defined")
except:
print("Something else went wrong")

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