<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def escape(self, varname, value):
 """ Escape `value` to fit in the place of this variable into the grammar. """

        f = self.escape_funcs.get(varname)
        return f(value) if f else value