python - Convert from ASCII string encoded in Hex to plain ASCII?

Python - Convert from ASCII string encoded in Hex to plain ASCII?

To convert a string encoded in hexadecimal to a plain ASCII string in Python, you can use the bytes.fromhex() method, which converts a string of hexadecimal numbers into a bytes object, and then decode it to a string using the decode() method.

Here's a simple example:

# Hexadecimal string hex_string = '48656c6c6f20576f726c6421' # Convert hex to bytes bytes_object = bytes.fromhex(hex_string) # Decode bytes to ASCII string ascii_string = bytes_object.decode('ascii') print(ascii_string)

In this example, the hexadecimal string '48656c6c6f20576f726c6421' corresponds to the ASCII string 'Hello World!'.

Let's break down the steps:

  1. Convert hex to bytes: The bytes.fromhex() method takes a hexadecimal string and returns a bytes object.
  2. Decode bytes to ASCII string: The decode('ascii') method converts the bytes object to a string using ASCII encoding.

You can replace hex_string with any hexadecimal string you need to convert.

Examples

  1. How to decode a hex-encoded string to plain ASCII in Python?

    • Description: Convert a hex-encoded string back to plain ASCII text.
    • Code:
      hex_string = "48656c6c6f20576f726c64" # Example hex string ascii_string = bytes.fromhex(hex_string).decode('ascii') print(ascii_string) # Output: Hello World

  2. How to handle spaces or separators in hex-encoded strings during decoding in Python?

    • Description: Decode a hex string that includes spaces or separators into plain ASCII.
    • Code:
      hex_string = "48 65 6c 6c 6f 20 57 6f 72 6c 64" # Hex string with spaces hex_string = hex_string.replace(' ', '') # Remove spaces ascii_string = bytes.fromhex(hex_string).decode('ascii') print(ascii_string) # Output: Hello World

  3. How to convert a hex-encoded byte string to ASCII text in Python?

    • Description: Convert a byte string encoded in hex format to plain ASCII.
    • Code:
      hex_bytes = b'48656c6c6f20576f726c64' # Example hex byte string ascii_string = bytes.fromhex(hex_bytes.decode('utf-8')).decode('ascii') print(ascii_string) # Output: Hello World

  4. How to handle non-printable characters or control codes when decoding hex in Python?

    • Description: Decode a hex-encoded string while handling non-printable ASCII characters or control codes.
    • Code:
      import codecs hex_string = "48656c6c6f2003576f726c64" # Hex string with non-printable characters ascii_string = codecs.decode(hex_string, 'hex').decode('ascii', 'ignore') print(ascii_string) # Output: Hello World

  5. How to convert a list of hex-encoded strings to plain ASCII in Python?

    • Description: Convert multiple hex-encoded strings from a list into plain ASCII text.
    • Code:
      hex_strings = ["48656c6c6f", "20576f726c64"] # List of hex strings ascii_strings = [bytes.fromhex(hex_str).decode('ascii') for hex_str in hex_strings] print(' '.join(ascii_strings)) # Output: Hello World

  6. How to decode a hex-encoded string to UTF-8 encoded text in Python?

    • Description: Decode a hex string to UTF-8 encoded text instead of ASCII.
    • Code:
      hex_string = "48656c6c6f20576f726c64" # Example hex string utf8_string = bytes.fromhex(hex_string).decode('utf-8') print(utf8_string) # Output: Hello World

  7. How to handle errors or exceptions when decoding hex to ASCII in Python?

    • Description: Implement error handling to manage exceptions that may occur during hex decoding.
    • Code:
      hex_string = "48656c6c6f20576f726c64" # Example hex string try: ascii_string = bytes.fromhex(hex_string).decode('ascii') except (ValueError, UnicodeDecodeError) as e: print(f"Error decoding hex string: {str(e)}") else: print(ascii_string) # Output: Hello World

  8. How to convert a hex string to a list of ASCII character codes in Python?

    • Description: Convert each pair of hex characters to their corresponding ASCII character code values.
    • Code:
      hex_string = "48656c6c6f20576f726c64" # Example hex string ascii_codes = [int(hex_string[i:i+2], 16) for i in range(0, len(hex_string), 2)] ascii_string = ''.join(chr(code) for code in ascii_codes) print(ascii_string) # Output: Hello World

  9. How to decode a hex string with mixed upper and lowercase letters in Python?

    • Description: Handle hex strings that may contain both uppercase and lowercase hexadecimal characters during decoding.
    • Code:
      hex_string = "48656C6C6F20576F726C64" # Mixed case hex string ascii_string = bytes.fromhex(hex_string.lower()).decode('ascii') print(ascii_string) # Output: Hello World

  10. How to decode a hex string with null bytes (0x00) in Python?

    • Description: Decode a hex string that includes null bytes (0x00) into plain ASCII.
    • Code:
      hex_string = "48656c6c6f2000576f726c64" # Hex string with null byte ascii_string = bytes.fromhex(hex_string).decode('ascii', 'ignore') print(ascii_string) # Output: Hello World

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