<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def symbol(self):
 """Gets the symbol under the current cursor."""

        if self._symbol is None:
            self._symbol = self._symbol_extract(cache.RE_CURSOR)
            
        return self._symbol