Scraping dynamic scrollable sites like Pinterest with selenium and bs4. //Please consult website TOS/robots.txt prior to use.

scrollScrape.py

from selenium import webdriver
from bs4 import BeautifulSoup
import io
import time

# Any infinity scroll URL
var = "machinelearning"
url = "https://pinterest.com/search/pins/?q=" + var 
ScrollNumber = 10  # The depth we wish to load
sleepTimer = 1     # Waiting 1 second for page to load

# Circumnavigate Bluetooth bug 
options = webdriver.ChromeOptions() 
options.add_experimental_option("excludeSwitches", ["enable-logging"])

driver = webdriver.Chrome(options=options)  # path=r'to/chromedriver.exe'
driver.get(url)

for _ in range(1,ScrollNumber):
    driver.execute_script("window.scrollTo(1,100000)")
    time.sleep(sleepTimer)

soup = BeautifulSoup(driver.page_source,'html.parser')

with io.open(f'{var}-posts.txt', 'w', encoding="utf-8") as out_file:
    for link in soup.find_all('img'):
        print(link.get('src'), file=out_file)  # All image URLs