[Python-checkins] bpo-27646: Say that 'yield from' expression can be any iterable (GH-24595)

[terryjreedy]

https://github.com/python/cpython/commit/2f9ef514fb24b6a95bd3272885f197752810c107
commit: 2f9ef514fb24b6a95bd3272885f197752810c107
branch: master
author: Terry Jan Reedy <tjreedy at udel.edu>
committer: terryjreedy <tjreedy at udel.edu>
date: 2021-02-20T21:33:25-05:00
summary:

bpo-27646: Say that 'yield from' expression can be any iterable (GH-24595)

Previously, the doc at least strongly implied that it had to be an iterator.

files:
A Misc/NEWS.d/next/Documentation/2021-02-20-00-09-13.bpo-27646.HRsmo-.rst
M Doc/reference/expressions.rst

diff --git a/Doc/reference/expressions.rst b/Doc/reference/expressions.rst
index c8c9b4683e62d..17705b117c372 100644
--- a/Doc/reference/expressions.rst
+++ b/Doc/reference/expressions.rst
@@ -478,8 +478,8 @@ allowing any pending :keyword:`finally` clauses to execute.
 .. index::
    single: from; yield from expression
 
-When ``yield from <expr>`` is used, it treats the supplied expression as
-a subiterator. All values produced by that subiterator are passed directly
+When ``yield from <expr>`` is used, the supplied expression must be an
+iterable. The values produced by iterating that iterable are passed directly
 to the caller of the current generator's methods. Any values passed in with
 :meth:`~generator.send` and any exceptions passed in with
 :meth:`~generator.throw` are passed to the underlying iterator if it has the
diff --git a/Misc/NEWS.d/next/Documentation/2021-02-20-00-09-13.bpo-27646.HRsmo-.rst b/Misc/NEWS.d/next/Documentation/2021-02-20-00-09-13.bpo-27646.HRsmo-.rst
new file mode 100644
index 0000000000000..8ba398adf6182
--- /dev/null
+++ b/Misc/NEWS.d/next/Documentation/2021-02-20-00-09-13.bpo-27646.HRsmo-.rst
@@ -0,0 +1,2 @@
+Clarify that 'yield from <expr>' works with any iterable, not just
+iterators.