NameError: name 'u1' is not defined (on parser code Python)

[Melcu54]

hello. I test a code, and it's not working:

from bs4 import BeautifulSoup
import bs4
import requests
import os
import re

def getHTMLText(url):
	try:
		headers = {'User-Agent':'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.103 Safari/537.36'}
		
		r = requests.get(url, headers=headers)
		r.raise_for_status()
		r.encoding = r.apparent_encoding
		return r.text
	except:
		return "NO"
	
def main():
        for i in range(100):
                url = 'https://movie.douban.com/subject/30362186/comments?start'
                url = url +str(20*i)
                html = getHTMLText(url)
                soup = BeautifulSoup(html, 'html.parser')
                for new in soup.select('.comments'):
                        for b in new.select('a'):
                                u1=b.text
                        for c in new.select('.short'):
                                u2=c.text
			
print(u1+u2)
		
main()

Error:
Traceback (most recent call last):
  File "C:\Folder2\html parser.py", line 32, in <module>
    print(u1+u2)
NameError: name 'u1' is not defined