t = 0 #변수, 상수 선언
g = 9.81
c = 12.5
m = 68.1
delta = 2.4
vel = 0


def velocity(t):
    value = vel + (g - c * vel / m) * delta #식의 해
    return value


print(t, vel)

for a in range(1, 100): #몇번 반복할지
    vel = velocity(t)
    t = t + delta
    print(t, vel)

from selenium import webdriver
import os

browser = webdriver.Chrome('C:/Users/OHG/Downloads/chromedriver_win32/chromedriver')  #Directory지정
browser.implicitly_wait(5)  #암묵적으로 3초 딜레이
url = "https://www.youtube.com/watch?v=94YwFIJ-yR0&list=PL3Eb1N33oAXijqFKrO83hDEN0HPwaecV3&index=1"
browser.get(url)

for a in range(1, 2): #url의 개수
        b = str(a)
        os.mkdir(b + "번째 기사")
        os.chdir(b + "번째 기사")
        print(a, "번째 url open")
        products = browser.find_elements_by_css_selector('#description > yt-formatted-string')
        f = open("기사 대본.txt", 'w')  #txt적기
        for product in products:
                Z = product.text
        f.write(Z[:-117])
        browser.save_screenshot("Website.png")
        os.chdir("..")
browser.quit()

from selenium import Webdriver

Webdriver.Firefox
Webdriver.Chrome
Webdriver.Ie
Webdriver.Opera
Webdriver.PhantomJS
Webdriver.Remote