Unable to locate element (Selenium) - selenium

Question

I am trying to annoy me elder brother by texting him repetitive messages via selenium on whatsapp. Problem is, it is not explicitly waiting for 2 seconds even when I am telling it to : button=WebDriverWait(driver, 2).until(EC.element_to_be_clickable((By.CLASS_NAME, '_35EW6')))
It messages him once, twice or thrice then stops.
Code is is as following:
from selenium import webdriver
from selenium.webdriver.common.keys import Keys
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC
from selenium.webdriver.common.by import By
driver=webdriver.Chrome("C:\setups\chromedriver\chromedriver.exe")
driver.get("https://web.whatsapp.com/")
name=input("Enter the name of person or group: ")
msg=input("Enter a message: ")
count=eval(input("How many times: "))
input("Wait for ENTER")
user=driver.find_element_by_xpath('//span[#title="{}"]'.format(name))
user.click()
msg_box=driver.find_element_by_class_name("_1Plpp")
for i in range(count):
msg_box.send_keys(msg)
msg_box.send_keys(Keys.RETURN)
button=driver.find_element_by_class_name('_35EW6')
# button.click()
button=WebDriverWait(driver, 2).until(EC.element_to_be_clickable((By.CLASS_NAME, '_35EW6')))
button.click()
The results are below:
DevTools listening on ws://127.0.0.1:52056/devtools/browser/23246055-9f5d-49f7-9677-01b3ab2e8905
Enter the name of person or group: Muhammad Faizan
Enter a message: Hacked
How many times: 15
Wait for ENTER
Traceback (most recent call last):
File "c:/Users/mnauf/Desktop/AI/practice/ksew.py", line 22, in <module>
button=driver.find_element_by_class_name('_35EW6')
File "C:\Users\mnauf\Anaconda3\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 564, in find_element_by_class_name
return self.find_element(by=By.CLASS_NAME, value=name)
File "C:\Users\mnauf\Anaconda3\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 978, in find_element
'value': value})['value']
File "C:\Users\mnauf\Anaconda3\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 321, in execute
self.error_handler.check_response(response)
File "C:\Users\mnauf\Anaconda3\lib\site-packages\selenium\webdriver\remote\errorhandler.py", line 242, in check_response
raise exception_class(message, screen, stacktrace)
selenium.common.exceptions.NoSuchElementException: Message: no such element: Unable to locate element: {"method":"class name","selector":"_35EW6"}
(Session info: chrome=69.0.3497.100)
(Driver info: chromedriver=2.42.591088 (7b2b2dca23cca0862f674758c9a3933e685c27d5),platform=Windows NT 10.0.17134 x86_64)

Answer 1

I simply removed
1. from selenium.webdriver.common.keys import Keys
2. msg_box.send_keys(Keys.RETURN)
3. button=driver.find_element_by_class_name('_35EW6')
and it worked.