GeezerVison

Doc/library/timeit.rst documents the signature as:

.. method:: Timer.autorange(callback=None, target_time=None)

but the parameter does not default to None:

# Lib/timeit.py
default_target_time = 0.2
...
    def autorange(self, callback=None, target_time=default_target_time):

None is not a usable value either — autorange does if time_taken >= target_time, which raises TypeError when compared against None. So a reader following the documented signature and passing target_time=None explicitly gets a crash rather than the default behaviour.

The parameter is new in 3.15 (added in gh-80642 / GH-140283), so this has not been wrong for long.

I used the concrete value rather than the constant name to match the neighbouring entries in the same file, which already do this:

.. method:: Timer.timeit(number=1000000)
.. method:: Timer.repeat(repeat=5, number=1000000)

rather than naming default_number and default_repeat.

Note on GH-144825

GH-144825 also edits this directive, but only rewords the description body; it leaves the signature line unchanged, so there is no overlap with this one-line change. That PR does incidentally drop the stray *Timer.target_time* reference on the following line (there is no such attribute — it should be *target_time*), so I have deliberately left that alone here to avoid conflicting with it.

Documentation only, so no NEWS entry.