argparse v2.2.3

• Character values are now passed as "raw" strings to Python (#51).

  • In particular this avoids triggering an error in Python 3.12
    when creating a string with escapes not supported by
    Python e.g. default = "\\D" will continue to return a
    default value of "\\D" instead of triggering an error.

  • However, this also means that any Python accepted escape
    sequences will no longer be interpreted as an escape sequence.
    If relying on such behaviour you may need to instead use
    the appropriate R escape sequences or Unicode values instead of Python escape sequences:

    • E.g. default = "\\t" will now return a default value of
      "\\t" (a t preceded by an (escaped) backslash)
      instead of "\t" (a horizontal tab).
    • https://docs.python.org/3/reference/lexical_analysis.html#escape-sequences
    • https://en.wikipedia.org/wiki/Basic_Latin_(Unicode_block)

  • Thanks Matthew Hall (@mdhall272) for bug report.