pwgen0.py

""" 
This does what you are trying to do, but with all the extraneous code eliminated.
Notice that strings are iterables, just like lists.  Any time you are making a list
of single characters, you should probably use a string.  Also notice that we write 
`'xxx'.upper()`, not `str.upper('xxx')`.  Also note that it is silly to write `
if result='N': pass`.  Just test for what you want to know.
"""
import random

lower_case_letters = 'abcdefghijklmnopqrstuvwxyz'
upper_case_letters = lower_case_letters.upper()
numbers = "1234567890"
symbols = '!@#$%^&*()-_=+.,/:l"[{]`|'

result = ''
choice = input("Do you want lower case letters? [Y] for YES and [N] for NO").upper()
if choice == "Y":
    result = result +  lower_case_letters
choice = input("Do you want upper case letters? [Y] for YES and [N] for NO").upper()
if choice == "Y":
    result = result +  upper_case_letters
choice = input("Do you want numbers? [Y] for YES and [N] for NO").upper()
if choice == "Y":
    result = result + numbers
choice = input("Do you want symbols? [Y] for YES and [N] for NO").upper()
if choice == "Y":
    result = result + symbols

choice = input("Do you want to repeat characters? [Y] for YES and [N] for NO").upper()
length = int(input("length of password"))


password = []
if choice == "N":
    while len(password) < length:
        password.append(random.choice(result))
else:
    result = random.shuffle(result)
    password = result[:length]

print(''.join(password))