def __repr__(self):
        return "<Requirement(package={package}, version='{version}')>".format(
            package=self.package, version=self.version)
def __init__(self, region, name, retention_in_days=7):
    super(LogGroup, self).__init__()
    self.region = region
    self.name = name
    self.retention_in_days = retention_in_days