R. David Murray added the comment:
This is a conscious design decision. See issue 15096.
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nosy: +r.david.murray
resolution: -> not a bug
stage: -> resolved
status: open -> closed
superseder: -> Drop support for the "ur" string prefix
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Python
New submission from Markus Unterwaditzer:
The string literal `ur'foo\d'` causes a SyntaxError while the equivalent
`r'foo\d'` causes the correct string to be produced.
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components: Interpreter Core
messages: 226281
nosy: untitaker
priority: normal
severity: normal
status: open
title: