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This module provides a monotonic() function which returns the value (in fractional seconds) of a clock which never goes backwards. It is compatible with Python 2 and Python 3.

On Python 3.3 or newer, monotonic will be an alias of time.monotonic from the standard library. On older versions, it will fall back to an equivalent implementation:

OS Implementation
Linux, BSD, AIX clock_gettime
Windows GetTickCount or GetTickCount64
OS X mach_absolute_time

If no suitable implementation exists for the current platform, attempting to import this module (or to import from it) will cause a RuntimeError exception to be raised.

monotonic is available via the Python Cheese Shop (PyPI):


Copyright 2014, 2015, 2016, 2017 Ori Livneh

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.