PEP 505: Bringing None-Aware Operators to Python

Re:PEP 505: Bringing None-Aware Operators to Python by singularity2001 on Monday August 13, 2018 @03:26AM (#17748546)

for nested loop you can do

   for child in node.children or []:
      for attrib in child.attributes or []:
         …

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Re:PEP 505: Bringing None-Aware Operators to Python by Doxin on Monday August 13, 2018 @08:10AM (#17749444)

That's generally considered unpythonic though. A more pythonic way to write that is

    for child in node.children if node.children else []:
        for attrib in child.attributes if child.attributes else []:
            ...

Which, granted, is a lot more verbose and probably not any more readable but at least it's not abusing the or operator.

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