Extracting the links from a website using python

You are getting ElementNotInteractableException: Message: element not interactable error because when webpages loaded a consent form appear. you need to accept the consent form then it will be able to interact the other elements.

Use WebDriverWait() and wait for consent form first to click and then the input element.

driver.get("https://www.pmid2cite.com/pmid-to-doi-converter")
WebDriverWait(driver, 10).until(EC.element_to_be_clickable((By.XPATH, "//p[text()='Consent']"))).click()
WebDriverWait(driver, 10).until(EC.element_to_be_clickable((By.CSS_SELECTOR, "#formInput"))).send_keys("20022636")

You need to import below libraries.

from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC
from selenium.webdriver.common.by import By

browser snapshot:

Here's the answer, it returns DOI for every PMID's in a given dataframe.

from selenium import webdriver
from webdriver_manager.chrome import ChromeDriverManager
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC
from selenium.webdriver.common.by import By
from selenium.common.exceptions import TimeoutException, WebDriverException, NoSuchElementException

driver = webdriver.Chrome(ChromeDriverManager().install())
driver.get("https://www.pmid2cite.com/pmid-to-doi-converter")
WebDriverWait(driver, 10).until(EC.element_to_be_clickable((By.XPATH, "//p[text()='Consent']"))).click()
for index, row in df.iterrows():
    try:
        
        #print(str(row['PMID']))
        WebDriverWait(driver, 10).until(EC.element_to_be_clickable((By.CSS_SELECTOR, "#formInput"))).send_keys(row['PMID'])
        driver.find_element_by_xpath("/html/body/div[5]/div[2]/form/button").click()
        res = [my_elem.get_attribute("innerHTML") for my_elem in WebDriverWait(driver, 20).until(EC.visibility_of_all_elements_located((By.XPATH, "/html/body/div[5]/div[3]/p[1]/span[2]/a")))]
        print(res)
        df.iloc[index, 1] = res[0]
    
    except TimeoutException:
        
        df.iloc[index, 1] = 'NA'
        
        
print('Done')

    PMID        DOI
0   277290620   10.1186/s13075-016-1133-8
1   110534327   10.1074/jbc.M004690200
2   97257504    NA
3   78270291    NA