averages

cpython.py

Python 2.7.8 (default, Nov 14 2014, 15:57:55)
[GCC 4.2.1 Compatible Apple LLVM 6.0 (clang-600.0.54)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> def avg1(nums):
...   return sum(nums) / float(len(nums))
...
>>> def avg2(nums):
...   count, tot = 0, 0
...   for num in nums:
...     count += 1
...     tot += num
...   return tot / float(count)
...
>>> avg1(range(100))
49.5
>>> avg2(range(100))
49.5
>>> from timeit import timeit
>>> timeit('avg1(range(100))', 'from __main__ import *')
2.8819470405578613
>>> timeit('avg2(range(100))', 'from __main__ import *')
14.88791298866272

pypy.py

Python 2.7.8 (f5dcc2477b97, Sep 19 2014, 18:09:54)
[PyPy 2.4.0 with GCC 4.2.1 Compatible Apple LLVM 5.1 (clang-503.0.38)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>>> def avg1(nums):
....   return sum(nums) / float(len(nums))
....
>>>> def avg2(nums):
....   count, tot = 0, 0
....   for num in nums:
....     count += 1
....     tot += num
....   return tot / float(count)
....
>>>> avg1(range(100))
49.5
>>>> avg2(range(100))
49.5
>>>> from timeit import timeit
>>>> timeit('avg1(range(100))', 'from __main__ import *')
0.27321791648864746
>>>> timeit('avg2(range(100))', 'from __main__ import *')
0.2980170249938965