#importing all necessary modules

import pickle
import random
import os
import tkinter

MasterKeyList = []
UserRecordsList = []

#Specifying paths for source files

fileIn1 = "MasterRecords.txt"
fileOut1 = "MasterRecords.txt"

fileIn2 = "UserRecords.txt"
fileOut2 = "UserRecords.txt"

######################################################################################################################################

# defining all necessary variables

def AddAccount(UserRecords):
    with open(fileOut2, "wb") as file:
        pickle.dump((UserRecords), (file))

def EditAccount(UserRecords):
    for i in range(len(UserRecords)):
        if records[i][0] == AccountName:
            records[i] = newRecord
        break
    return records

def FindAccount(UserRecords):
    AccountName = input("Enter the name of the account you wish to search for e.g reddit")

    for i in range(len(records)):
        if UserRecords[i][1].lower() == AccountName:
            return UserRecords[i]

def DeleteAccount(UserRecords):
        for i in range(len(UserRecords)):
            if UserRecords[i][0] == AccountName:
                del UserRecords[i]
                break
            
        return UserRecords 

def CreateMasterKey(NewKey):
        with open(fileOut1, "wb") as file:
            pickle.dump((NewKey), (file))

def GetMasterKey(MasterRecords):
    MasterKey
######################################################################################################################################

# First menu 

# Login stage
def login():
    attempts = 3

    choosing = True
    while choosing:
        choice = int(input("1)Login\n2)Register\n3)Quit\n> "))

        # login
        if choice ==1:
            for cd in reversed(range(attempts)):
                MasterKey = input("Enter your master key to continue:")
                if input("Enter your master key to continue:") == MasterKey():
                    return True
                else:
                    print ("Incorrect, {} attempts remaining..".format(cd))
            return False

        # Registration stage
        elif choice ==2:
            if choice ==2:
                print ("Welcome to SmartPass please create your master key,")
                print ("this key will be required the next time you login")
                print ("please take not of this key as you will be unable to recover it if lost.")
                print ("")
                print ("")
            MasterKey = input("Enter your master Key:")
            print("Your master key has been successfully created!")
            CreateMasterKey(NewKey)
            LoggedIn = True
            choosing = False

        # Quit option
        elif choice ==3:
            print("Thank you for using SmartPass, bye now")
            os.exit(3)

        else:
            print("Invalid input, please try again")

def main():

    if login():
        print("You are currently logged in to SmartPass")
        loggedIn = True

        while LoggedIn:
            choice = int(input("1)Add account\n2)Edit\n3)Display all accounts\n4)Find account\n5)Delete account\n6)Generate random password\n7)Logout\n> "))
                        
        # Add Account option
        if choice ==1:
            account = "stuff"
            AddAccount(UserRecords)

        # Edit Account option
        elif choice ==2:
            input("Enter the name of the account you wish to edit:")
            EditAccount(UserRecords)

        # View all accounts/records
        elif choice ==3:
            DisplayAccounts(UserRecords)

        # Find Account
        elif choice ==4:
            print("Enter the name of the account you would like to find e.g facebook")
            FindAccount(UserRecords)

        # Delete Account
        elif choice ==5:
            DeleteAccount(UserRecords)

        # Generate random password option
        elif choice ==6:
            alphabet = "abcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ#!$&(@3187%=+}{<->?"
        pw_length = 15
        mypw = ""

        for i in range(pw_length):
            next_index = random.randrange(len(alphabet))
        mypw = mypw + alphabet[next_index]

        print(mypw)

        # Logout and quit program
        if choice ==7:
            LoggedIn = False
            print("Logging out of your session....")

        else:
            print("You are now logged out, bye!")

if __name__ == "__main__":
    main()

1. Don't use pickle to save consistent data outside of Python. Sometimes the format changes after an update and then your data is lost. Use something different. First you can try plain text files, later you should look for an database.
   
2. Don't invent your own password manager, if you don't know about hashing, symmetric and asymmetric encryption and entropy. You can still do your program, to understand the concepts behind a little bit better.
   
3. Functions in Python are doing something. Use verbs for functions, lower case and underscore.
   
4. Look into the string module of the Python stdlib. There are already prepared strings for ascii_lowercase, ascii_uppercase, digits
   
5. Python don't have a switch statement. Instead of asking for every selected option, you can make a dict for this task:
   

   def create_user():
   username = input('Enter your username: ')
   # code
   
   def delete_user():
   username = input('Enter your username: ')
   # code
   
   selection_dict = {0: create_user, 1: delete_user}
   userinput = int(1) # user choose option 1
   try:
   function_to_call = selection_dict[userinput]
   except KeyError:
   print('You have selected a non existing option...')
   else:
   function_to_call()

6. Later you can try to do the same task object oriented. But first do the basics.