Python 3 | Beautiful Soup For Loop, Variable not assigned - regex

Question

I'm in the process of learning Python, and I decided to train a bit of my programming by trying to make a program that could research text in a site called "Library of Babel" (https://libraryofbabel.info/)
I'm using BeautifulSoup to get the actual text out of the HTML code and I'm then using Regular Expressions to search for what I'm looking for, in this case I was testing it with just the leter "a".
But for some reason the code gives a error and says the variable I'm searching the "a" on, is not assigned.
Code:
import re
import requests
from bs4 import BeautifulSoup
url = "https://libraryofbabel.info/browse.cgi"
pages,data=[],[]
r = requests.get(url)
r = r.text
soup = BeautifulSoup(r,"html.parser")
for text in soup.findAll("li",{"onclick":"gethexfromlist(this.innerHTML); enterhex();"}):
page = text.string
pages.append(page)
for eachRoom in pages:
url = "https://libraryofbabel.info/browse.cgi?" + eachRoom
for eachWall in range(1,5):
url = url + "-w" + str(eachWall)
for eachShelf in range(1,6):
url = url + "s-" + str(eachShelf)
for eachVolume in range(1,33):
if len(str(eachVolume)) == 1:
url = url + "-v0" + str(eachVolume)
else:
url = url + "-v" + str(eachVolume)
for eachPage in range(1,411):
url = url + ":" + str(eachPage)
r = requests.get(url)
r = r.text
soup = BeautifulSoup(r,"html.parser")
for text in soup.findAll("div",{"class":"bookrealign"}):
rdata = text.string
if data == []:
data = re.findall(r"a",rdata)
else:
break
Error:
Traceback (most recent call last):
File "C:\Users\...", line 37, in <module>
data = re.findall(r"a",rdata)
NameError: name 'rdata' is not defined
Thanks in advance for any help given :)

Answer 1

Your if is outside the loop and soup.findAll("div",{"class":"bookrealign"}) finds nothing so rdata never gets defined.