import UserList
class JobQ(UserList.UserList):
    def add(self,job):
        self.append(job)
    
    
    def next(self):
        j = self.data[0]
        self.data = self.data[1:]
        return j
    def check(self):
        if len(self.data) == 0:
            return None
        return self.data[0]
    
    def __str__(self):
        res=""
        for j in self.data:
            filename=j[0] ; length=j[1]
            res = res+' '+filename+'('+str(length)+')'
        return res