test with db

def setup():
    if not os.path.exists('datas.db'):
        conn = sqlite3.connect('datas.db')
        cur = conn.cursor()
        cur.execute("CREATE TABLE users (user TEXT, email TEXT)")
        conn.close()

def enter_datas(user, email):
    conn = sqlite3.connect('datas.db')
    cur = conn.cursor()
    for user_db in cur.execute('SELECT * from users'):
        if user == user_db[0]:
            return False
    cur.execute("INSERT INTO users (user, email) VALUES (?, ?)"
        , (user, email))
    conn.commit()
    conn.close()
    return True

def read_datas():
    conn = sqlite3.connect('datas.db')
    cur = conn.cursor()
    print(" USERS ".center(80, '-'))
    for row in cur.execute('SELECT * FROM users'):
        print(row)
    conn.close()