method1-6 are taken from this article
method7 is added because I believe using generator expression would be faster
to run this experiment, you'll need to install line_profiler, memory_profiler and psutil first, all of which are just one pip install away.
after installing these profiling tools, we can run stest.py like this:
kernprof.py -l -v stest.py method1
python -m memory_profiler stest.py method7| from cStringIO import StringIO | |
| import sys | |
| loop_count = 100000 | |
| def method1(): | |
| out_str = '' | |
| for num in xrange(loop_count): | |
| out_str += `num` | |
| return out_str | |
| def method2(): | |
| from UserString import MutableString | |
| out_str = MutableString() | |
| for num in xrange(loop_count): | |
| out_str += `num` | |
| return out_str | |
| def method3(): | |
| from array import array | |
| char_array = array('c') | |
| for num in xrange(loop_count): | |
| char_array.fromstring(`num`) | |
| return char_array.tostring() | |
| def method4(): | |
| str_list = [] | |
| for num in xrange(loop_count): | |
| str_list.append(`num`) | |
| out_str = ''.join(str_list) | |
| return out_str | |
| def method5(): | |
| file_str = StringIO() | |
| for num in xrange(loop_count): | |
| file_str.write(`num`) | |
| out_str = file_str.getvalue() | |
| return out_str | |
| def method6(): | |
| return ''.join([`num` for num in xrange(loop_count)]) | |
| def method7(): | |
| return ''.join(`num` for num in xrange(loop_count)) | |
| if __name__ == '__main__': | |
| for i in sys.argv: | |
| if i.startswith('method'): | |
| profile(globals()[i])() | |
| break |