Deprecate codecs.open() #133036

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1. methane

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   stdlibStandard Library Python modules in the Lib/ directoryStandard Library Python modules in the Lib/ directory

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   pythongh-133036: deprecate codecs.open

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   gh-133036: Deprecate codecs.open (#133038)

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9. ngoldbaum commented on Aug 7, 2025

   

   ngoldbaum

   on Aug 7, 2025

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   I don't know if this deserves a better clarification in the deprecation notice, but I hit a corner case that took me a few minutes to understand today. Perhaps commenting here will help someone else.

   I tried replacing codecs.open with open in a spot in pandas and hit this error:

   >               with open(as_json, "wb", encoding="utf8") as f:
                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   E               ValueError: binary mode doesn't take an encoding argument
   

   I fixed it by replacing "wb" with "w". It seems codecs.open is a little more permissive here than open.