<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _remove(self, n):
 """Remove one single file """

        if os.path.isfile(n):
            os.remove(n)
        if not os.path.isfile(n):
            print("File '{0}' removed".format(n))