How to reuse an expression in a comprehension expression?

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Yes! Python 3.8 introduces the “Assignment operator” :=, which allows you to define a variable within the local scope of a single expression (e.g. a comprehension). In your example, you would do this:

result = {(p := next(k for k in ('path', 'subdir') if k in e)): some_func(p) 
          for e in bad_structure}

Disclaimer: this will not work in any version of python before 3.8.

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