human
Solve the following python programming problem given the following code:
def create_hash_id(self, salt, string) : 
    if (not string.hash_id) : 
        def generate_hash_id() : 
            return hashlib.sha1 (('%s%s%s' % (salt, string, str (time.time ())))).hexdigest () [: 11] 
self.hash_id = generate_hash_id () 
        while (self.__class__.objects (hash_id = self.hash_id).first () is not None) : 
            self.hash_id = generate_hash_id () 

    
    

    Fix the buggy line: if (not string.hash_id) :
assistant
#Here is Python program to fix the buggy line: if (not string.

if (not self.hash_id) :