A stupid encryption method for text files with ASCII characters, other characters won't be encrypted (like unicode)
How to read from files: https://www.w3school.com.cn/python/ref_file_read.asp How to write to files: https://www.w3school.com.cn/python/ref_file_write.asp How to get ASCII code from chars and how to form chars from ASCII code: https://www.runoob.com/python3/python3-ascii-character.html