Application of executemany and sequence in python

a code

import sqlite3
persons=[
    ("Jim","Green"),
    ("Hu","jie")
    ]
conn=sqlite3.connect(":memory:")
conn.execute("CREATE TABLE person(firstname,lastname)")
conn.executemany("INSERT INTO person(firstname,lastname) VALUES(?,?)",persons)
for row in conn.execute("SELECT firstname,lastname FROM person"):
    print(row)
    
print("I just deleted",conn.execute("DELETE FROM person").rowcount,"rows")

 

Second run results

and ========

('Jim', 'Green')

('Hu', 'jie')

I just deleted 2 rows