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To transform a string from ANSI/hexadecimal format to Unicode, you can use the following steps:

1. Convert the hexadecimal string to a byte array using the hex_decode() method.
2. Decode the byte array using the decode() method with the ANSI encoding parameter. This will give you a Unicode string.

Here's some sample Python code that demonstrates the conversion:

# Example ANSI/hexadecimal string
ansistr = "48656c6c6f20576f726c64"

# Convert from hex to byte array
bytesarr = bytes.fromhex(ansistr)

# Decode the byte array to Unicode string
unicode_str = bytesarr.decode('ansi')

print(unicode_str) # Output: "Hello World"

In this example, the hex() function is used to convert the hexadecimal string to a byte array. The decode() method is then used to decode the byte array using the ANSI encoding parameter. The resulting Unicode string is then printed to the console.