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undef variable

Beautiful Bee answered on October 1, 2021 Popularity 3/10 Helpfulness 3/10

answer undef variable

undef variable

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Testing if a Variable Is Defined
Credit: Hamish Lawson

Problem
You want to take different courses of action based on whether a variable is defined.

Solution
In Python, all variables are expected to be defined before use. The None object is a value you often assign to signify that you have no real value for a variable, as in:

try: x
except NameError: x = None
Then it’s easy to test whether a variable is bound to None:

if x is None:
    some_fallback_operation(  )
else:
    some_operation(x)

Popularity 3/10 Helpfulness 3/10 Language python

Source: www.oreilly.com

Tags: python undef

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Contributed on Oct 01 2021

Beautiful Bee

0 Answers Avg Quality 2/10

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