Dead Simple User Login Database in Python Under 50 Lines

import datetime
import os
def main():
  my_dict = {}
  count = 0
  time = datetime.datetime.now().strftime("%a, %d %B %Y %H:%M:%S")
  print(time)
  userCount = float(input("How many members are being logged?: "))
  while count < userCount:
    member = input("Enter desired member login: ")
    password = input("Enter desired password [DIGITS ONLY!]: ")
    while not password.isdigit():
      print('Invalid Password!')
      password = input("Enter desired password [DIGITS ONLY!]: ")
    userInfo = member+','+password+'\n'
    myfile = open('myfile.txt','a')
    myfile.write(userInfo)
    count += 1
    myfile.close()
  myfile = open('myfile.txt','r')
  for line in myfile.readlines():
    line = line.split(',')
    key = line[0].strip()
    value = line[1].strip()
    my_dict[key] = value
  logger(my_dict,time,key,value)
def logger(my_dict,time,key,value):
  userSearch = input("Search for a user: ")
  if userSearch in my_dict.keys():
    print("User Found!")
    login = input("Do you want to login into the given user? [y/n]: ")
    if login == 'y':
      password = input('Enter Password: ')
      if password == my_dict.get(userSearch,value):
        print('\n')
        print(time)
        print("Welcome!")
        input("Press any key to quit example.") #to keep open until any key pressed
      else:
        print("Incorrect Password!")
    else:
      logger()
  else:
    print("User Not Found!")
main()