def get_pw(foo):
	#ask for site address
	site_name = input('Please enter site name...')	
	print('Did you include an tld ext in the site name? .com? .edu? etc?')
	ext_remover = input('enter \'yes\' or \'no\'')
	#since most ppl won't follow directions and will include tld exts
	if ext_remover.strip().lower() == 'yes' or ext_remover == 'y':
		remove_tld(site_name)
	else:
		print('good job...;) ')
	print('\n\nfoo\n\n')
	filen = 'pwkpr.csv'
	sn_list = []
	pw_list = []
	with open(filen, 'a+',newline='') as f:
		file_read = csv.reader(f)
		for line in file_read:
			sname = line[0]#get site_names
			pword = line[1]#get pws
			sn_list.append(sname)
			pw_list.append(pword)
		#bc my csv is empty locate_site_row should be None...
		locate_site_row = sn_list.index(site_name)
		#line below should be triggered
		if locate_site_row ==None:
			add_entry(site_name)
		#if record exists, just look it up
		else:
			locate_pw = pw_list[locate_site_row]
			print(f'password for {site_name} is {locate_pw}')

Output:
Traceback (most recent call last):
  File "pwkpr1.py", line 80, in <module>
    prime()
  File "pwkpr1.py", line 16, in prime
    get_pw(repository)			
  File "pwkpr1.py", line 55, in get_pw
    locate_site_row = sn_list.index(site_name)
ValueError: 'fb' is not in list

#!usr/bin/env python3

#pwkpr1.py

import os, csv, sys
def prime():
	using = 0#simple counter
	while True:
		os.chdir('/home/me/Desktop')
		print(os.getcwd())
		repository=input('enter \'start\' to access repository')
		#check if user want to proceed
		if repository.strip().lower() == 'start' or repository == 's':
			using += 1
			#user elects to proceed
			get_pw(repository)			
			repository = input('\'start\' to go again...anything else to leave...')
			if repository.strip().lower() == 'start' or repository == 's':
				continue
		else:
			#user enters something other than 'start'/'s'
			#ask to confirm that they want to quit
			repository =input('are you sure you want to quit?\n\'yes\' to exit, \'no\' to start')
			#user changes their mind. Wants to looks up password afterall
			if repository.strip().lower() == 'no' or repository =='n':
				get_pw(repository)
			#user wants to quit.
			else:
				print(f'you used system {using} times(s)')
				sys.sleep(2)
				sys.exit()

def get_pw(foo):
	#ask for site address
	site_name = input('Please enter site name...')	
	print('Did you include an tld ext in the site name? .com? .edu? etc?')
	ext_remover = input('enter \'yes\' or \'no\'')
	#since most ppl won't follow directions and will include tld exts
	if ext_remover.strip().lower() == 'yes' or ext_remover == 'y':
		remove_tld(site_name)
	else:
		print('good job...;) ')
	print('\n\nfoo\n\n')
	filen = 'pwkpr.csv'
	sn_list = []
	pw_list = []
	with open(filen, 'a+',newline='') as f:
		file_read = csv.reader(f)
		for line in file_read:
			sname = line[0]#get site_names
			pword = line[1]#get pws
			sn_list.append(sname)
			pw_list.append(pword)
		#bc my csv is empty locate_site_row should be None...
		locate_site_row = sn_list.index(site_name)
		#line below should be triggered
		if locate_site_row ==None:
			add_entry(site_name)
		#if record exists, just look it up
		else:
			locate_pw = pw_list[locate_site_row]
			print(f'password for {site_name} is {locate_pw}')

#just practice with splitext()...works
def remove_tld(site):
	name, tld = os.path.splitext(site.strip().lower())
	print(f'site is {name}.')
	return name

#func to create an entry if none exists. no parameter needed?
def add_entry(site):
	pw = input('Please enter password.')
	pw = pw.strip()
	with open(filen, 'a+') as f:
		#delimiter should be necessary to add comma
		add_line = csv.writer(f, delimiter=',')
		#site_name value from get_pw()
		add_line.writerow(site_name, pw)

prime()

        locate_site_row=None
        if site_name in sn_list:
            locate_site_row = sn_list.index(site_name)
        else:
            add_entry(site_name)