I want to whether the cityname(from csv file) is present in given sentence.

cityNameFromCSV.py

import csv
from re import search

#example_sent2 = "Sunset is the time of day when our sky meets the outer space solar winds. There are blue, pink, and purple swirls, spinning and twisting, like clouds of balloons caught in a whirlwind. The sun moves slowly to hide behind the line of horizon, while the moon races to take its place in prominence atop the night sky. People slow to a crawl, entranced, fully forgetting the deeds that must still be done. There is a coolness, a calmness, when the sun does set..XYZ, Example Exports as my Post Office Box 924 Yavatmal - 445001 INDIA.Ram is a very good student."

pin = []
ct = []
#for loading csv file into list
with open('pincode_final.csv',"r") as csvfile:
    csv_f = csv.reader(csvfile)
    for row in csv_f:
        pin.append(row[0]) #for future use
        ct.append(row[1]) #etc for all columns
        
print(len(ct))   
matches = []

#example_sent2 = "Anusandhan Bhawan, C-56/1, Sector-62,Allahabad  - 201307 Uttar Pradesh (India)"
example_sent2 = "Anusandhan Bhawan, C-56/1, Sector-62, Bhadohi  - 201307 Uttar Pradesh (India)"
#print(random.choice(ct))
for city in ct:
    if search(r'\b{}\b'.format(city), example_sent2):
        print(search(r'\b{}\b'.format(city), example_sent2))
        break
    
#print(matches)

https://www.kaggle.com/sahilgandhi94/indian-pincodes/downloads/indian-pincodes.zip/1
Here's the csv file.
The problem is I'm able to search upto 1981 records but after I am getting error.