String concatenation in CPython 2.7 and PyPy 1.4

gistfile1.py

(12:01a) (sumeet@shanoa:~)$ `which python2.7` ./timethese.py string_concat.py 10000000
# Running code block #1

        assert ''.join(('abc', 'def', 'ghi')) == 'abcdefghi'

Took 2.855692 seconds to run 10000000 times.

# Running code block #2

        assert 'abc' + 'def' + 'ghi' == 'abcdefghi'

Took 0.762806 seconds to run 10000000 times.

# Running code block #3

        assert '%s%s%s' % ('abc', 'def', 'ghi') == 'abcdefghi'


Took 3.625320 seconds to run 10000000 times.


(12:01a) (sumeet@shanoa:~)$ `which pypy` ./timethese.py string_concat.py 10000000
# Running code block #1

        assert ''.join(('abc', 'def', 'ghi')) == 'abcdefghi'

Took 2.484319 seconds to run 10000000 times.

# Running code block #2

        assert 'abc' + 'def' + 'ghi' == 'abcdefghi'

Took 0.034994 seconds to run 10000000 times.

# Running code block #3

        assert '%s%s%s' % ('abc', 'def', 'ghi') == 'abcdefghi'


Took 0.034827 seconds to run 10000000 times.