Yipify

yipify.py

import sys

def yipify(input_file, output_file):
  # Open the input and output files
  with open(input_file, 'rb') as infile, open(output_file, 'w') as outfile:
    # Read the input file, one byte at a time
    byte = infile.read(1)
    while byte:
      # Convert the byte to a binary string
      binary = format(ord(byte), 'b')
      # Prepend 0s to the binary string until it is 8 characters long
      binary = binary.zfill(8)
      # Write "yip" for every 1 and "yap" for every 0 in the binary string
      outfile.write(''.join(["yip" if ch == "1" else "yap" for ch in binary]))
      # Read the next byte
      byte = infile.read(1)

def decode(input_file, output_file):
  # Open the input and output files
  with open(input_file, 'r') as infile, open(output_file, 'wb') as outfile:
    # Read the input file, one character at a time
    char = infile.read(3)
    # Initialize an empty binary string
    binary = ""
    while char:
      # If the character is "yip", add a "1" to the binary string
      if char == "yip":
        binary += "1"
      # If the character is "yap", add a "0" to the binary string
      elif char == "yap":
        binary += "0"
      # If the binary string has 8 characters (a full byte), convert it to a byte and write it to the output file
      if len(binary) == 8:
        outfile.write(bytes([int(binary, 2)]))
        # Reset the binary string
        binary = ""
      # Read the next character
      char = infile.read(3)

def main():
  # Check that the correct number of arguments were provided
  if len(sys.argv) != 4:
    print("Usage: python yipify.py [mode] [input file] [output file]")
    sys.exit(1)
  # Get the mode, input and output filenames
  mode = sys.argv[1]
  input_file = sys.argv[2]
  output_file = sys.argv[3]

  # Check the mode and call the appropriate function
  if mode == "encode":
    yipify(input_file, output_file)
  elif mode == "decode":
    decode(input_file, output_file)
  else:
    print("Invalid mode. Valid modes are 'encode' and 'decode'.")
    sys.exit(1)

# Run the main function
if __name__ == "__main__":
  main()