If value true but null not work

Question

I made program is input number and delete data in mysql. but run program error then report sql1 Syntax Error\i change true

#!/usr/bin/python

import mysql.connector

conn = mysql.connector.connect(host="",user="",passwd="",db="")
cursor = conn.cursor()

try:
        num = int(input("InputNumber 1-10 : "))
        if num <= 10:
                if num == null: //if null print false
                        sql1 = "SELECT user1 FROM dt WHERE user1 = '%d' " %(num)
                        cursor.execute(sql1)
                        data = cursor.fetchall()
                print(data[0])
                sqlde = "DELETE FROM dt WHERE user1 = '%d' " %(num)
                cursor.execute(sqlde, (num))
                print "DELETE SUCESS"
                conn.commit()
        else:
                print "Data Empty"
except:
        conn.rollback()

conn.close()

Answer 1

num = int(input("InputNumber: ")) <- don't forguet to close it

I'm not sure about the %i, I always see using %d for Integer and %s to strings

But, you also have one problem into your query, SQL Injection

So to avoid this, try something like this

sql1 = "DELETE FROM dt WHERE user1 = ?"
                try:
                        cursor.execute(sql1, (num))
                        print "DELETE SUCECC"
                        conn.commit()
                except:
                        conn.rollback()
                        print "ERROR DELETE"

you can check about question mark here or here and understand why you should bind your values