Create table in SQLite only if it doesn't exist already

From http://www.sqlite.org/lang_createtable.html:

CREATE TABLE IF NOT EXISTS some_table (id INTEGER PRIMARY KEY AUTOINCREMENT, ...);

Am going to try and add value to this very good question and to build on @BrittonKerin's question in one of the comments under @David Wolever's fantastic answer. Wanted to share here because I had the same challenge as @BrittonKerin and I got something working (i.e. just want to run a piece of code only IF the table doesn't exist).

        # for completeness lets do the routine thing of connections and cursors        conn = sqlite3.connect(db_file, timeout=1000)         cursor = conn.cursor()         # get the count of tables with the name          tablename = 'KABOOM'         cursor.execute("SELECT count(name) FROM sqlite_master WHERE type='table' AND name=? ", (tablename, ))        print(cursor.fetchone()) # this SHOULD BE in a tuple containing count(name) integer.        # check if the db has existing table named KABOOM        # if the count is 1, then table exists         if cursor.fetchone()[0] ==1 :             print('Table exists. I can do my custom stuff here now.... ')            pass        else:            # then table doesn't exist.            custRET = myCustFunc(foo,bar) # replace this with your custom logic