human
Solve the following python programming problem given the following code:
def restart(self) : 
    "
        Forcefully restarts Varnish in the remote server.

        Example:
        ::

            from provy.core import Role
            from provy.more.debian import VarnishRole

            class MySampleRole(Role):
                def provision(self):
                    with self.using(VarnishRole) as role:
                        if not self.is_process_running('varnishd'):
                            role.restart()
        " 
    command = 'START=yes /etc/init.d/varnish restart' 
    self.execute (self, sudo = True) 

    
    

    Fix the buggy line: self.execute (self, sudo = True)
assistant
#Here is Python code to fix the buggy line: self.

self.execute (command, sudo = True)