Python try…except comma vs ‘as’ in except

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The definitive document is PEP-3110: Catching Exceptions

Summary:

  • In Python 3.x, using as is required to assign an exception to a variable.
  • In Python 2.6+, use the as syntax, since it is far less ambiguous and forward compatible with Python 3.x.
  • In Python 2.5 and earlier, use the comma version, since as isn’t supported.

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