Encountered an error - Mailing list psycopg

From Shaan Repswal
Subject Encountered an error
Date
Msg-id CALa+hEQbGNBNoA8CmbiJj7q4G3x0Ji0jWiJZUre_W5Hp_1XTww@mail.gmail.com
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List psycopg
I am trying to insert a new record into my "prototypedb" database. This here below is the section of my code that I am using to access and work on my database.

What I am trying to do here is enter one record (three values) in three columns name, code and type. Then create a new column and then add one value to the new column for the aforementioned already entered record.

cur = conn.cursor()

        #Enter the three value basic record
        cur.execute("""INSERT INTO inventory (name, code, type)
                    VALUES (%s, %s, %s);""", [self.entry_product_name.get_text(), self.new_product_code.get_text(), self.new_product_type.get_text()])

        #Take out list of Text Entry boxes
        #self.quantity_list is a list of two value tuples each of which holds a reference to a text box in my GUI
        for x in self.quantity_list:
            if x[0].get_text() !="" and x[1].get_text() != "":
                #First make the appropriate column
                cur.execute("""ALTER TABLE inventory
                            ADD %s integer DEFAULT NULL;""", [x[0].get_text()])
                #Then give that column the appropriate value for the current record
                cur.execute("""UPDATE inventory
                            SET %s = %s
                            WHERE name = %s;""", [x[0].get_text(), x[1].get_text(), self.entry_product_name.get_text()])
            else:
                continue;

        conn.commit()
        cur.close()
        conn.close()


But Alas! There is an Error!

Traceback (most recent call last):
  File "C:\Python34\prototype_husk.py", line 134, in submit_data
    ADD %s integer DEFAULT NULL;""", [x[0].get_text()])
psycopg2.ProgrammingError: syntax error at or near "'26.2 LTRS'"
LINE 2:                             ADD '26.2 LTRS' integer DEFAULT ...
                                        ^


I have attached herein a screenshot of the values entered. So the error can make more sense.
Attachment

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