New submission from STINNER Victor <[email protected]>:
The behaviour of the time.clock() function is not portable: on Windows it
mesures wall-clock, whereas it measures CPU time on Unix. Python has
time.process_time() and time.perf_counter(), since Python 3.3, which are
portable, well defined and have a better resolution.
time.clock() was deprecated in Python 3.3 documentation, but calling
time.clock() didn't raise a DeprecationWarning. I proposed to remove it from
Python 3.7.
Sometimes, a deprecated function raises a DeprecationWarning in Python version
N, before removing it from Python version N. time.clock() doesn't emit such
warning, but I consider that it is possible to remove it anyway.
While it can be annoying to have to patch code to no more use time.clock(), I
consider that it's worth it for portability and better clock resolution.
Attached PR removes time.clock() and time.get_clock_info() doens't accept
'clock' anymore.
Current time.clock() documentation:
----------------------------
.. function:: clock()
.. index::
single: CPU time
single: processor time
single: benchmarking
On Unix, return the current processor time as a floating point number
expressed
in seconds. The precision, and in fact the very definition of the meaning of
"processor time", depends on that of the C function of the same name.
On Windows, this function returns wall-clock seconds elapsed since the first
call to this function, as a floating point number, based on the Win32
function
:c:func:`QueryPerformanceCounter`. The resolution is typically better than
one
microsecond.
.. deprecated:: 3.3
The behaviour of this function depends on the platform: use
:func:`perf_counter` or :func:`process_time` instead, depending on your
requirements, to have a well defined behaviour.
----------------------------
----------
components: Library (Lib)
messages: 304502
nosy: haypo
priority: normal
severity: normal
status: open
versions: Python 3.7
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<https://bugs.python.org/issue31803>
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