How to do almost same thing on all opened windows in Selenium Python?

So I have a program that opens as multiple windows as the number of XLSX file entered. For example, If user browse 5 XLSX file, Selenium opens 5 WordPress new post page.

But I want it to write these files each one to each window. Here is my while loop.

def selenium_process():
driver = webdriver.Chrome(data[3])
x = 0

#Opening the first window for logging in.

driver.get(data[0])
driver.find_element_by_id("user_login").send_keys(data[1])
driver.find_element_by_id("user_pass").send_keys(data[2])
driver.find_element_by_id("wp-submit").click()

#Sending a random Title string for test.

driver.find_element_by_xpath("/html/body/div[1]/div[2]/div[2]/div[1]/div[3]/form/div/div/div[1]/div[1]/div[1]/input").send_keys("Hello")

    #Opening other windows

    while x <= postCount - 2:
        driver.execute_script(f"window.open('{data[0]}');")
        driver.find_element_by_xpath("/html/body/div[1]/div[2]/div[2]/div[1]/div[3]/form/div/div/div[1]/div[1]/div[1]/input").send_keys("New Windows")
        x = x + 1
        if(x>postCount - 2):
            time.sleep(10000000)

(I'm getting postCount variable from the counts of XLSX files)

How can I fix that? Any ideas?

Thanks much.