Please write a python program that will help the customer to keep track of his/her daily expenses so that the customer can view summaries of his/her expenses by category (food, gas, travel, entertainment, etc) monthly, quarterly, yearly, or for any specific time period. The program should also allow a group of users that share expenses to keep track of their total shared expenses, who paid how much of the shared expenses, and who owed how much money to who else. The use of this program should require usernames and passwords.