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I have a list part of an if clause:

 if context and a in b :

If the list is empty I receive the following error: 

ValueError: invalid literal for int() with base 10: ''

I can check if the list is empty with no issues with no errors using: 

   if not context:

But I need the vice-versa working. I tried also

if context is not None

but the same error. I don't understand why using not is working and without is not working.

user3541631
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1 Answers1

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if context is not None is comparing the object reference to 'None', not checking if the object itself is empty. This post may help you understand it better.

Sergio Abreu García
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