On 8/11/2019 1:26 AM, Serhiy Storchaka wrote:
10.08.19 22:10, Glenn Linderman пише:
As pointed out elsewhere, Raw strings have limitations, paths ending
in \ cannot be represented, and such do exist in various situations,
not all of which can be easily avoided... except by the "extra
character contortion" of "C:\directory\ "[:-1] (does someone know a
better way?)
Other common idiom is
r"C:\directory" "\\"
I suppose that concatenation happens at compile time; less sure about
[:-1], I would guess not. Thanks for this.
I wonder how many raw strings actually use the \" escape
productively? Maybe that should be deprecated too! ? I can't think
of a good and necessary use for it, can anyone?
This is an interesting question. I have performed some experiments. 15
files in the stdlib (not counting the tokenizer) use \' or \" in raw
strings. And one test (test_venv) is failed because of using them in
third-party code. All cases are in regular expressions. It is possible
to rewrite them, but it is less trivial task than fixing invalid
escape sequences. So changing this will require much much more long
deprecation period.
Couldn't they be rewritten using the above idiom? Why would that be less
trivial?
Or by using triple quotes, so the \" could be written as " ? That seems
trivial.
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