Elapsed timer and utilities
Python elapsed time utilities.
The main interface to this package is an ElapsedTimer class. This class will use the highest resolution timer available to Python depending on the OS, either time.time() or time.clock(). Its purpose is easily to measure and print the duration of a task, and is normally meant to be used as a context manager.
>>> with ElapsedTimer('say hello'): ... print 'hi there!' hi there! 13.113 µs: say hello
The constructor for ElapsedTimer takes an optional string describing the operation being performed. It also optionally accepts a file object to change where the resulting duration message will be printed. The output file defaults to sys.stdout.
The constructor can also take a logger instance and log level via the optional logger and loglevel keyword parameters. If a logger is provided, it takes precedence over a file object and the duration message will be output via the logger. The log level defaults to DEBUG.
You can control an ElapsedTimer instance directly instead of using it as a context manager. It has start() and stop() methods. The stop() method will not print the duration for you like exiting a context manager instance does.
There is an elapsed property that returns the elapsed time since start() was called or the context manager entered. A timedelta property is also available that returns the elapsed time as a datetime.timedelta object instead of a float, though note that this class this only has microsecond resolution.
There is a module-level enable variable that acts as a global enable switch for all printing of results by ElapsedTimer. It defaults to True.
Another class in the module is Timeout. It adds a few methods to make it easy to check for timeouts. You can use this class as a context manager. The constructor takes the same parameters as for ElapsedTimer, except for a new first param of the timeout in seconds.
There are two methods to check the timeout, check() and check_and_raise(). The former compares the elapsed time against the timeout and returned True if a timeout occurred. The latter will raise TimeoutError if a timeout happens. You can use the timed_out property to as another way to check, equivalent to calling check().
This package is licensed under the BSD three-clause license. See the LICENSE file for details.
Copyright © 2014-2016 Chris Reed.
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