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What do you understand by undefined variable in Python ?

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Answer

In Python, a variable is not created until some value is assigned to it. A variable is created when a value is assigned to it for the first time. If we try to use a variable before assigning a value to it then it will result in an undefined variable. For example:


print(x)   #This statement will cause an error for undefined variable x
x = 20
print(x)

The first line of the above code snippet will cause an undefined variable error as we are trying to use x before assigning a value to it.

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