New submission from Lele Gaifax:

Python 3.6+ is stricter about escaped sequences in string literals.

The documentation need some improvement to clarify the change: for example first says that “Unknown 
escapes such as \& are left alone” then, in the “Changed in” section below, 
states that “[in Py3.6] Unknown escapes consisting of '\' and an ASCII letter 
now are errors”.

When such changes are made, usually the documentation reports the 
“new”/“current” behaviour, and the history section mention when and how some 
detail changed.

See this thread for details:

assignee: docs@python
components: Documentation
messages: 278716
nosy: docs@python, lelit
priority: normal
severity: normal
status: open
title: Misleading/inaccurate documentation about unknown escape sequences
versions: Python 3.6

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