time.clock() documentation [1] says:

  this is the function to use for benchmarking Python or timing algorithms.

and

  Deprecated since version 3.3: The behaviour of this function depends on the platform: use perf_counter() or process_time() instead, depending on your requirements, to have a well defined behaviour.


[1]: https://hg.python.org/cpython/file/a22ef88143b9/Doc/library/time.rst#l127

The first remark is incorrect since 3.3. I've attached a documentation patch that removes it.