Load a template from a string.  This parses the source given and
        returns a :class:`Template` object.

def from_string(self, source, globals=None, template_class=None):
        """Load a template from a string.  This parses the source given and
        returns a :class:`Template` object.
        """
        globals = self.make_globals(globals)
        cls = template_class or self.template_class
        return cls.from_code(self, self.compile(source), globals, None)