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[3.6] bpo-28739: Document that f-strings cannot be used as docstring (GH-592) #600

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11 changes: 11 additions & 0 deletions Doc/reference/lexical_analysis.rst
Original file line number Diff line number Diff line change
Expand Up @@ -696,6 +696,17 @@ a temporary variable.
>>> f"newline: {newline}"
'newline: 10'

Formatted string literals cannot be used as docstrings, even if they do not
include expressions.

::

>>> def foo():
... f"Not a docstring"
...
>>> foo.__doc__ is None
True

See also :pep:`498` for the proposal that added formatted string literals,
and :meth:`str.format`, which uses a related format string mechanism.

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