How would you do the equivalent of preprocessor directives in Python?

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There’s __debug__, which is a special value that the compiler does preprocess. 

if __debug__:
  print "If this prints, you're not running python -O."
else:
  print "If this prints, you are running python -O!"

__debug__ will be replaced with a constant 0 or 1 by the compiler, and the optimizer will remove any if 0: lines before your source is interpreted.

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