<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def delete(self):
 """Deletes the current session file"""

        if self.filename == ':memory:':
            return True
        try:
            os.remove(self.filename)
            return True
        except OSError:
            return False