Tornado & PostgreSQL & Python

I send request to the Tornado server. Handler looks like:

def myHandler (self, callback):      string = self.get_arguments('string', None)      query = 'SELECT * FROM table_name WHERE value LIKE \'%s%\''      with self.db.blocking connection as conn:           cursor = conn.cursor()           cursor.execute (query,[string])      response = cursor.fetchall()      callback (response) 

It doesn't work. But I try in the terminal: SELECT * FROM table_name WHERE value LIKE \'?%\'; and it works.

So what's wrong in this code?

Source: http://dba.stackexchange.com/questions/33893/tornado-postgresql-python

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