time.clock was removed in python 3.8 (#2112)
time.clock was removed in python 3.8 (#2112)

Looks like time.clock was deprecated back in 3.3 and finally removed in 3.8. Looks like [process_time](https://docs.python.org/3/library/time.html#time.process_time) and [perf_counter](https://docs.python.org/3/library/time.html#time.perf_counter) replaced it.
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