old_results.md

IMPORTANT: The rows Method 2: setdefault, iteritems() in Table 1 and Method 2: setdefault in Table 2 were obtained actually with dict.get() instead of dict.setdefault(). As stated on the 2018-09-16 update, I thought the --use_setdefault option was implemented when I ran the main script compute_avg_run_time.py which was not the case. dict.get() was used instead of dict.setdefault(). Check the newest results where I re-ran the python commands with the updated code.

The following two tables present average run times that were obtained with python scripts having commit HASH c834169f4b7f74f21e3fe3006483baa44f83ef91.

Table 1 Average running times of different methods
of reversing a dict in Python 2.7

Py2 Method	Avg time (µsec), 1k items, 100k times	Avg time (µsec), 10k items, 1k times	Avg time (µsec), 100k items, 1k times
Method 1: dict comprehension, iteritems()	233.02	3009.04	45815.60
Method 1: dict comprehension, items()	273.22	4484.39	73327.81
Method 2: dict.get, iteritems()	772.42	10035.83	125039.90
Method 2: setdefault, iteritems()	910.63	11369.59	131220.12
Method 3: map(reversed, iterable), iteritems()	856.57	10712.58	121904.58

Table 2 Average running times of different methods
of reversing a dict in Python 3

Py3 Method	Avg time (µsec), 1k items, 100k times	Avg time (µsec), 10k items, 1k times	Avg time (µsec), 100k items, 1k times
Method 1: dict comprehension	96.81	946.01	20405.42
Method 2: dict.get	373.60	4287.52	63150.73
Method 2: setdefault	372.67	4321.50	63432.81
Method 3: map(reversed,)	312.13	3190.19	45776.68