How can I retrieve wall-time in Python using the standard library?
This question, and this question would suggest that something like clock_gettime(CLOCK_MONOTONIC_RAW) or /proc/uptime are most appropriate on Linux. On Windows, time.clock() has the desired effect.
I would use time.time(), but the function is not guaranteed to return monotonically (and linearly) increasing time values.
Victor Stinner wrote a Python implementation of a monotonic timer. See http://bugs.python.org/issue10278 for the discussion and the docs for the upcoming 3.3 release referencing the new feature (coded in C).
There is also Monoclock:
Monoclock is a Python module that provides access to the monotonic clock on POSIX-like OSes that have
librt.Compatibility: tested on CPython 2.6.5, CPython 2.7, pypy 1.3, and pypy 1.4.
来源：https://stackoverflow.com/questions/4687408/retrieve-wall-time-in-python-using-the-standard-library