版本号比较，fork from https://stackoverflow.com/questions/1714027/version-number-comparison-in-python

version_compare

import re

def mycmp(version1, version2):
    def normalize(v):
        return [int(x) for x in re.sub(r'(\.0+)*$','', v).split(".")]
    return cmp(normalize(version1), normalize(version2))

if __name__ == '__main__':
	assert mycmp("1", "1") == 0
	assert mycmp("2.1", "2.2") < 0
	assert mycmp("3.0.4.10", "3.0.4.2") > 0
	assert mycmp("4.08", "4.08.01") < 0
	assert mycmp("3.2.1.9.8144", "3.2") > 0
	assert mycmp("3.2", "3.2.1.9.8144") < 0
	assert mycmp("1.2", "2.1") < 0
	assert mycmp("2.1", "1.2") > 0
	assert mycmp("5.6.7", "5.6.7") == 0
	assert mycmp("1.01.1", "1.1.1") == 0
	assert mycmp("1.1.1", "1.01.1") == 0
	assert mycmp("1", "1.0") == 0
	assert mycmp("1.0", "1") == 0
	assert mycmp("1.0", "1.0.1") < 0
	assert mycmp("1.0.1", "1.0") > 0
	assert mycmp("1.0.2.0", "1.0.2") == 0