[Tutor] Python .decode issue

[james campbell]

I have been currently trying to get a small piece of code to work, but keep getting an error:

header_bin = header_hex.decode('hex')
AttributeError: 'str' object has no attribute 'decode'


The source of this code is from: https://en.bitcoin.it/wiki/Block_hashing_algorithm
 Here is the the code:
  >>> import hashlib >>> header_hex = ("01000000" + "81cd02ab7e569e8bcd9317e2fe99f2de44d49ab2b8851ba4a308000000000000" + "e320b6c2fffc8d750423db8b1eb942ae710e951ed797f7affc8892b0f1fc122b" + "c7f5d74d" + "f2b9441a" + "42a14695") >>> header_bin = header_hex.decode('hex') >>> hash = hashlib.sha256(hashlib.sha256(header_bin).digest()).digest() >>> hash.encode('hex_codec') '1dbd981fe6985776b644b173a4d0385ddc1aa2a829688d1e0000000000000000' >>> hash[::-1].encode('hex_codec') '00000000000000001e8d6829a8a21adc5d38d0a473b144b6765798e61f98bd1d'

I get the above error when I input this line by line into Win7 IDLE 3.3.3. Hopefully somebody can point me in the right direction. Thanks.
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