Simple CLI to help decipher monoalphabetic ciphers

python3 MonoSub.py <text file to decipher>

• Simple UI showing text and deciphered text.
• Count character frequencies.
• Save your solution and load them later.

• add <source> <dest> adds transformation rule from each character in source to each character in dest. For example, add abc the changes a to t, b to h, and c to e.
• remove <char> resets one character at a time.
• clear clears the screen and print the message again.
• reset resets all characters.
• frequency shows the frequency of all characters.
• autofreq (on/off) turns auto printing of character frequency on or off.
• summary summarises all transformation rules.
• save saves transformation rules into a pickle file.
• load loads transformation rules from a pickle file made by save command.
• quit or exit quits. Much easier than vim.