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-rw-r--r--Doc/library/stdtypes.rst4
1 files changed, 4 insertions, 0 deletions
diff --git a/Doc/library/stdtypes.rst b/Doc/library/stdtypes.rst
index ce83757de2..a513d4008d 100644
--- a/Doc/library/stdtypes.rst
+++ b/Doc/library/stdtypes.rst
@@ -2208,6 +2208,10 @@ pairs within braces, for example: ``{'jack': 4098, 'sjoerd': 4127}`` or ``{4098:
See :class:`collections.Counter` for a complete implementation including
other methods helpful for accumulating and managing tallies.
+ .. versionchanged:: 3.3
+ If the dict is modified during the lookup, a :exc:`RuntimeError`
+ exception is now raised.
+
.. describe:: d[key] = value
Set ``d[key]`` to *value*.