simple_version.py

class SimpleVersion():
	def __init__(self, major, minor, patch):
		self.major = major
		self.minor = minor
		self.patch = patch

	@classmethod
	def fromstring(c, version_str):
		split = [int(x or "0") for x in version_str.split(".")]

		while len(split) < 3:
			split.append(0)

		return c(split[0], split[1], split[2])

	def __lt__(self, other):
		if self.major != other.major:
			return self.major < other.major
		elif self.minor != other.minor:
			return self.minor < other.minor
		elif self.patch != other.patch:
			return self.patch < other.patch

		return False

	def __gt__(self, other):
		if self.major != other.major:
			return self.major > other.major
		elif self.minor != other.minor:
			return self.minor > other.minor
		elif self.patch != other.patch:
			return self.patch > other.patch

		return False

	def __eq__(self, other):
		return self.major == other.major and self.minor == other.minor and self.patch == other.patch

	def __le__(self, other):
		return self.__eq__(other) or self.__lt__(other)

	def __ge__(self, other):
		return self.__eq__(other) or self.__gt__(other)

	def __str__(self):
		return ".".join([str(self.major), str(self.minor), str(self.patch)])

	def __repr__(self):
		return "SimpleVersion({}, {}, {})".format(self.major, self.minor, self.patch)

	def __hash__(self):
		return hash((self.major, self.minor, self.patch))