83 8 Create Your Own Encoding Codehs Answers Exclusive

encoder

This assignment asks you to invent a cipher—a system for scrambling text—and implement both an and a decoder . The most common and reliable approach for this assignment is the Caesar Cipher (shifting the alphabet), but with a twist to ensure it is "your own."

  1. (2 min) Present learning goals.
  2. (3 min) Show demo mapping (two-digit decimal).
  3. (5 min) Student work: design mapping + encode a 6–10 character message.
  4. (3–5 min) Swap and decode, brief reflection.

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By applying the operation and decoding the message, we get: encoder This assignment asks you to invent a

. Instead of using the standard 8-bit ASCII (which has 256 possible characters), Bo realized they only needed to send capital letters (A-Z) and a space. To be efficient, Bo calculated that they only needed for their code, since , which is plenty for 26 letters and a space. Their Secret Code Table: When Bo sent 00111 00100 01011 01011 01110 (2 min) Present learning goals

Structure

: Every character must use the same fixed bit length (e.g., all characters are 5 bits long) to allow for consistent decoding. Determining the Bit Length

Creating Your "Own" Encoding

def encode(s): result = [] for ch in s: result.append(encode_map[ch]) return "".join(result)

return decoded_message