Re: A python question

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On 14/7/24 1:10 pm, Jon LaBadie wrote:
On Sun, Jul 14, 2024 at 12:24:02PM +1000, Eyal Lebedinsky wrote:
Following the upgrade f38->f40 I started getting warnings and errors. This is one.

What is the correct escapes to select strings starting with (AD) and [AD]?

/usr/local/bin/mythtv-fix-descriptions.py:33: SyntaxWarning: invalid escape sequence '\['
  re_tag = re.compile ("^[\[(]AD[\])] *")

If I remove the escapes I get:

/usr/local/bin/mythtv-fix-descriptions.py:33: FutureWarning: Possible nested set at position 2
  re_tag = re.compile ("^[[(]AD[])] *")

However making it a raw string removes the warning, but will it do the right thing?

  re_tag = re.compile (r"^[\[(]AD[\])] *")


Assuming myth follows the basic RE syntax, square brackets must be included in a class positionally, not by escaping them.  They must
immediately follow the opening square bracket.  This should do it.

     ^[[(]AD[])]

Note however two undesired strings will match

      [AD)  and (AD]

True, but these do not occur in the data.

jl


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Eyal at Home (fedora@xxxxxxxxxxxxxx)

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