Importing the enum module in the re module slows down Python startup by 34%
when Python is run from a virtual environment, or more generally when the re
module is imported at startup but not the enum module.

Update and augment description of the configuration system.

Patch by Elvis Pranskevichus.

Also update versionadded directive to 3.5.3.

Patch by Jim Fulton.

WARNING: Could not lex literal_block as "c". Highlighting skipped.

Patch by SilentGhost.

Move the still relevant parts of it to the previous
chapter, "Errors and Exceptions".

StopIteration with value. More safely handle non-normalized exceptions
in -_PyGen_FetchStopIterationValue.

StopIteration with value. More safely handle non-normalized exceptions
in -_PyGen_FetchStopIterationValue.

Update docs to reflect new behavior around backslashes in expressions (not allowed), matching recent changes to PEP 498.

Update test_no_escapes_for_braces to clarify behavior with a docstring and expressions that clearly are not evaluated.

Additionally show that a backslash-escaped opening brace is treated as a literal and thus triggers the single closing brace error, clarifying #28590.

Add an additional test with a newline, one that's very similar to test_parens_in_expressions, but because the newline is not a literal newline, but a backslash en, this error is triggered.

PyDict_GetItemWithError().  Patch by Xiang Zhang.

This matches the documentation, and passes the test suite when multithreading
is disabled.

Patch by Anish Tambe.

when called from coroutines or callbacks.

Patch by Mariatta Wijaya.