Automated Python 2 to 3 code translation

Re:Automated Python 2 to 3 code translation by eesmith on Thursday August 17, 2017 @10:23AM (#15037016)

"asdf".encode("hex")

Is there a tool which knows to translate this to:

  import binascii
  binascii.b2a_hex(b"asdf")

Even worse, if the string isn't known to be a byte string or ASCII unicode string, it's something like:

  import binascii
  binascii.b2a_hex(s.encode("ascii") if isinstance(s, str) else s)

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Re:Automated Python 2 to 3 code translation by tyingq on Thursday August 17, 2017 @11:37AM (#15037705)

Sure...that's a different thing though. Python 3's choice to introduce new types and change behavior of existing types means no automated tool can really decide what to do.

The snippet I posted is a little different in that it runs on both Python 2 as well as 3, but the 2to3 tools choke on it.

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Re:Automated Python 2 to 3 code translation by eesmith on Thursday August 17, 2017 @01:36PM (#15038930)

Ahh, yes, you're right.

I'm still irritated by this specific case because my code and documentation used s.encode("hex") often, and it took a while to fix them all. Especially as the original code used both str and unicode hex-encoded values, so I couldn't drop in binascii. I ended up adding a C extension function.

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