def has_virtualenv(self):
        """
        Returns true if the virtualenv tool is installed.
        """
        with self.settings(warn_only=True):
            ret = self.run_or_local('which virtualenv').strip()
            return bool(ret)
def has_virtualenv(self):
        """
        Returns true if the virtualenv tool is installed.
        """
        with self.settings(warn_only=True):
            ret = self.run_or_local('which virtualenv').strip()
            return bool(ret)
Returns true if the virtualenv tool is installed.