Python check help pls

Requirements Submit only the files requested Print all real numbers to 2 decimal points unless stated otherwise Restrictions No global variables may be used NEW: You may not import any modules Description Write a program called bin_str.py that takes a binary string that also contains x's and prints out all possible binary strings where the x's can be replaced with either O's or 1's. A binary string is a string made up of O's and 1's. Input Input will always be valid An X should also be treated as an x