Write a PYTHON program that incorporates an algorithm with a function that will check whether or not a string is in a valid password format with the following rules:

A password must have at least ten characters. A password consists of only letters, digits and symbol(s). A password must contain at least two digits.

A password must contain at least one uppercase letter

A password must contain at least one special symbol

Your program should continue to prompt until the user enters a valid password.

Regular expressions (regex) are not allowed!