On 22/02/2020 06:26, Steven D'Aprano wrote:
Actually, in Python, regexes are the primary reason raw strings were
added!
Raw strings aren't quite fully raw, which is why you can't use raw
strings for Windows paths:
path = r'somewhere\some\folder\'
doesn't work. The reason is that "raw" (semi-cooked?) strings are
s/are/were/
intended for regexes, not as a general mechanism for disabling string
escape codes, and regexes aren't allow to end with a bare backslash.
https://docs.python.org/3/faq/design.html#why-can-t-raw-strings-r-strings-end-with-a-backslash
So maybe it's time to make raw strings really raw? They do have uses
other than regexes, as your path example shows.
I've been bitten by this gotcha a few times.
Your docs link states "... they allow you to pass on the string quote
character by escaping it with a backslash."
I don't have access to a Python 3 version right now, but that is not
true in Python 2:
Python 2.7.10 (default, May 23 2015, 09:44:00) [MSC v.1500 64 bit
(AMD64)] on win32
Type "help", "copyright", "credits" or "licence" for more information.
>>> r'x\'y'
"x\\'y"
>>> list(_)
['x', '\\', "'", 'y']
(Apologies for the double vertical spacing, I'm wrestling with my email
server.)
Rob Cliffe
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