Shortcut method to upgrade a package. If `force` is set to True,
        the package and all of its dependencies will be reinstalled, otherwise
        if the package is up to date, this command is a no-op.

def upgrade(self, package, force=False):
        """Shortcut method to upgrade a package. If `force` is set to True,
        the package and all of its dependencies will be reinstalled, otherwise
        if the package is up to date, this command is a no-op."""
        self.install(package, upgrade=True, force=force)