bpo-37116: Use PEP 570 syntax for positional-only parameters. (GH-13700)
diff --git a/Doc/library/string.rst b/Doc/library/string.rst
index c2f6522..288dde6 100644
--- a/Doc/library/string.rst
+++ b/Doc/library/string.rst
@@ -88,7 +88,7 @@
The :class:`Formatter` class has the following public methods:
- .. method:: format(format_string, *args, **kwargs)
+ .. method:: format(format_string, /, *args, **kwargs)
The primary API method. It takes a format string and
an arbitrary set of positional and keyword arguments.
@@ -720,7 +720,7 @@
The constructor takes a single argument which is the template string.
- .. method:: substitute(mapping, **kwds)
+ .. method:: substitute(mapping={}, /, **kwds)
Performs the template substitution, returning a new string. *mapping* is
any dictionary-like object with keys that match the placeholders in the
@@ -729,7 +729,7 @@
and there are duplicates, the placeholders from *kwds* take precedence.
- .. method:: safe_substitute(mapping, **kwds)
+ .. method:: safe_substitute(mapping={}, /, **kwds)
Like :meth:`substitute`, except that if placeholders are missing from
*mapping* and *kwds*, instead of raising a :exc:`KeyError` exception, the