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I made code for signing in users and storing data about them. Everything is fully encrypted and secure. It is meant to be imported into other code. I'm looking for ways to improve it and to fix any bugs.

import pickle
import base64

class user():
 def __init__(self, username, password, user_data):
 self.username = username
 self.password = password
 self.user_data = user_data

def get_user():
 try:
 user_saves = open("users", 'rb')
 users = dict(pickle.load(user_saves))
 user_saves.close
 name, password, users = sign_in(users)
 except:
 name, password, users = new_user(True)

 name = base64.b64decode(name.decode('utf-8'))
 password = base64.b64decode(password.decode('utf-8'))
 return name, password, users

def new_user(is_first = False, users=None):
 print('Creating account... ')
 if users != None:
 loop = True
 while loop:
 name = input('What is your username: ')
 name = base64.b64encode(name.encode('utf-8'))
 if name in users: 
 print('Already taken.') 
 else: 
 loop = False
 password = input('What is your password: ')
 password = base64.b64encode(password.encode('utf-8'))
 else:
 name = input('What is your username: ')
 name = base64.b64encode(name.encode('utf-8'))
 password = input('What is your password: ')
 password = base64.b64encode(password.encode('utf-8'))
 if is_first == True:
 user = name:password
 user_saves = open("users", 'wb')
 pickle.dump(user, user_saves)
 add_user_data('', password, True)
 return name, password, user
 else:
 add_user_data('', password)
 users.update(name:password)
 user_saves = open("users", 'wb')
 pickle.dump(users, user_saves)
 return name, password, users
 user_saves.close

def sign_in(users):
 nsi = True #not signed in
 while nsi == True:
 username = input('What is your username: ')
 username = base64.b64encode(username.encode('utf-8'))
 if username in users:
 password = input('What is your password: ')
 password = base64.b64encode(password.encode('utf-8'))
 if password == users.get(username):
 print('working')
 nsi = False
 return username, password
 else:
 print('Wrong password.')
 else:
 yn = y_or_n('y or n, are you a new user: ')
 if yn == True:
 nsi = False
 name, password = new_user(users=users)
 return name, password

def y_or_n(promt):
 ni = True #no input
 while ni: 
 yn = input(promt).lower()
 if yn == 'y':
 return True
 elif yn == 'n':
 return False
 else:
 print('y or n')

def add_user_data(data, password, is_first=False):
 password = base64.b64encode(password.encode('utf-8'))
 data = base64.b64encode(data.encode('utf-8'))
 if is_first == True:
 user_data = password:data
 users_data = open("users_data", 'wb')
 pickle.dump(user_data, users_data)
 else:
 user_data.update(password:data)
 users_data = open("users_data", 'wb')
 pickle.dump(user_data, users_data)
 users_data.close

def get_user_data(password):
 password = base64.b64encode(password.encode('utf-8'))
 user_data = pickle.load('user_data')
 user_data = base64.b64decode(user_data.decode('utf-8'))
 return user_data

def delete_user(name, data, ):
 data.pop('name', None)


name, password, users = get_user()
data = get_user_data(password)
print(data)
user_stats = user(name, password, data)