列表索引超出范围错误（第二次）

Question

This code works for the first line of the input file but fails in the second trial and I don't know why. I tried to see if there are similar questions but I didn't found a solution.

carac=":"
fichier = open("test", "r")
for i in range(2):
    time.sleep(0.5)

    chaine = fichier.readline().split(carac)
    print(chaine[0])

    driver = webdriver.Chrome(r'C:\Users\bh\Downloads\chromedriver')
    driver.get('https://www.twitter.com/login')
    username_box = driver.find_element_by_class_name('js-username-field')
    username_box.send_keys(chaine[0])
    password_box = driver.find_element_by_class_name('js-password-field')
    password_box.send_keys(chaine[1])

I have this error:

Traceback (most recent call last):
  File "C:/Users/bh/PycharmProjects/test/twitter.py", line 199, in <module>
    password_box.send_keys(chaine[1])
IndexError: list index out of range

ps: the document is a .txt in the document there is something like this :

test@gmail.com:pass
test@gmail.com:pass

Answer 1

this happens because you havent assigned a value to chaine[1]. You need to declare it before you use it. Why you use a sleep function? print chaine[1] to see if its empty or not