BIP69: fix output inconsistency and update to python3

- Fix print_outputs() to use sorted output tuples instead of unsorted
- Add Python 3 compatibility using functools.cmp_to_key()
- Convert string hashes to byte arrays in second example
- Make file executable with shebang for python3
- Add clearer output formatting with transaction hashes and section headers

bip-0069/bip-0069_examples.py

@@ -1,4 +1,6 @@
+#!/usr/bin/env python3
 import binascii
+from functools import cmp_to_key
 
 #returns -1 if barr1 is less, 1 if barr1 is greater, and 0 if equal
 def bytearr_cmp(barr1, barr2):
@@ -32,9 +34,10 @@ def input_cmp(input_tuple1, input_tuple2):
 		raise ValueError('Matching previous transaction hash and previous transaction output index for two distinct inputs. Invalid!')
 
 def sort_inputs(input_tuples):
-	return sorted(input_tuples, cmp=input_cmp)
+	return sorted(input_tuples, key=cmp_to_key(input_cmp))
 
 def print_inputs(ordered_input_tuples):
+	print("inputs")
 	index = 0
 	for prev_tx_hash_byte_arr_little_endian, prev_tx_output_index in ordered_input_tuples:
 		prev_tx_hash_hex = binascii.hexlify(bytearray(prev_tx_hash_byte_arr_little_endian))
@@ -52,9 +55,10 @@ def output_cmp(output_tuple1, output_tuple2):
 	return bytearr_cmp(output_tuple1[1], output_tuple2[1])
 
 def sort_outputs(output_tuples):
-	return sorted(output_tuples, cmp=output_cmp)
+	return sorted(output_tuples, key=cmp_to_key(output_cmp))
 
 def print_outputs(ordered_output_tuples):
+	print("outputs")
 	index = 0
 	for amount, scriptPubKey_byte_arr in ordered_output_tuples:
 		scriptPubKey_hex = binascii.hexlify(bytearray(scriptPubKey_byte_arr))
@@ -82,6 +86,7 @@ def main():
 		([0x7d, 0x03, 0x7c, 0xeb, 0x2e, 0xe0, 0xdc, 0x03, 0xe8, 0x2f, 0x17, 0xbe, 0x79, 0x35, 0xd2, 0x38, 0xb3, 0x5d, 0x1d, 0xea, 0xbf, 0x95, 0x3a, 0x89, 0x2a, 0x45, 0x07, 0xbf, 0xbe, 0xeb, 0x3b, 0xa4], 1),
 		([0x6c, 0x1d, 0x56, 0xf3, 0x1b, 0x2d, 0xe4, 0xbf, 0xc6, 0xaa, 0xea, 0x28, 0x39, 0x6b, 0x33, 0x31, 0x02, 0xb1, 0xf6, 0x00, 0xda, 0x9c, 0x6d, 0x61, 0x49, 0xe9, 0x6c, 0xa4, 0x3f, 0x11, 0x02, 0xb1], 1),
 		([0xb4, 0x11, 0x2b, 0x8f, 0x90, 0x0a, 0x7c, 0xa0, 0xc8, 0xb0, 0xe7, 0xc4, 0xdf, 0xad, 0x35, 0xc6, 0xbe, 0x5f, 0x6b, 0xe4, 0x6b, 0x34, 0x58, 0x97, 0x49, 0x88, 0xe1, 0xcd, 0xb2, 0xfa, 0x61, 0xb8], 0)]
+	print("\ntx 0a6a357e2f7796444e02638749d9611c008b253fb55f5dc88b739b230ed0c4c3")
 	tx_0a6a_sorted_input_tuples = sort_inputs(tx_0a6a_input_tuples)
 	print_inputs(tx_0a6a_sorted_input_tuples)
 
@@ -94,10 +99,11 @@ def main():
 
 	#reference data: https://blockchain.info/rawtx/28204cad1d7fc1d199e8ef4fa22f182de6258a3eaafe1bbe56ebdcacd3069a5f thanks @quantabytes!
 	tx_2820_input_tuples = [
-		# (prev_tx_hash, prev_tx_output_index)
+		# (prev_tx_hash_byte_arr_little_endian, prev_tx_output_index)
-		("35288d269cee1941eaebb2ea85e32b42cdb2b04284a56d8b14dcc3f5c65d6055", 0),
+		([0x55, 0x60, 0x5d, 0xc6, 0x5f, 0x3c, 0xcc, 0x4d, 0xb1, 0xd8, 0x56, 0x4a, 0x28, 0x04, 0x2b, 0xdb, 0x2c, 0x2b, 0xe3, 0x85, 0xea, 0xb2, 0xeb, 0xea, 0x41, 0x19, 0xee, 0x9c, 0x26, 0x8d, 0x28, 0x35], 0),
-		("35288d269cee1941eaebb2ea85e32b42cdb2b04284a56d8b14dcc3f5c65d6055", 1)] #duplicate prev_tx_hash
+		([0x55, 0x60, 0x5d, 0xc6, 0x5f, 0x3c, 0xcc, 0x4d, 0xb1, 0xd8, 0x56, 0x4a, 0x28, 0x04, 0x2b, 0xdb, 0x2c, 0x2b, 0xe3, 0x85, 0xea, 0xb2, 0xeb, 0xea, 0x41, 0x19, 0xee, 0x9c, 0x26, 0x8d, 0x28, 0x35], 1)] #duplicate prev_tx_hash
 
+	print("\ntx 28204cad1d7fc1d199e8ef4fa22f182de6258a3eaafe1bbe56ebdcacd3069a5f")
 	tx_2820_sorted_input_tuples = sort_inputs(tx_2820_input_tuples)
 	print_inputs(tx_2820_sorted_input_tuples)
 
@@ -106,7 +112,7 @@ def main():
 		(100000000, [0x41, 0x04, 0x6a, 0x07, 0x65, 0xb5, 0x86, 0x56, 0x41, 0xce, 0x08, 0xdd, 0x39, 0x69, 0x0a, 0xad, 0xe2, 0x6d, 0xfb, 0xf5, 0x51, 0x14, 0x30, 0xca, 0x42, 0x8a, 0x30, 0x89, 0x26, 0x13, 0x61, 0xce, 0xf1, 0x70, 0xe3, 0x92, 0x9a, 0x68, 0xae, 0xe3, 0xd8, 0xd4, 0x84, 0x8b, 0x0c, 0x51, 0x11, 0xb0, 0xa3, 0x7b, 0x82, 0xb8, 0x6a, 0xd5, 0x59, 0xfd, 0x2a, 0x74, 0x5b, 0x44, 0xd8, 0xe8, 0xd9, 0xdf, 0xdc, 0x0c, 0xac]),
 		(2400000000, [0x41, 0x04, 0x4a, 0x65, 0x6f, 0x06, 0x58, 0x71, 0xa3, 0x53, 0xf2, 0x16, 0xca, 0x26, 0xce, 0xf8, 0xdd, 0xe2, 0xf0, 0x3e, 0x8c, 0x16, 0x20, 0x2d, 0x2e, 0x8a, 0xd7, 0x69, 0xf0, 0x20, 0x32, 0xcb, 0x86, 0xa5, 0xeb, 0x5e, 0x56, 0x84, 0x2e, 0x92, 0xe1, 0x91, 0x41, 0xd6, 0x0a, 0x01, 0x92, 0x8f, 0x8d, 0xd2, 0xc8, 0x75, 0xa3, 0x90, 0xf6, 0x7c, 0x1f, 0x6c, 0x94, 0xcf, 0xc6, 0x17, 0xc0, 0xea, 0x45, 0xaf, 0xac])]
 	tx_2820_sorted_output_tuples = sort_outputs(tx_2820_output_tuples)
-	print_outputs(tx_2820_output_tuples)
+	print_outputs(tx_2820_sorted_output_tuples)
 
 if __name__ == "__main__":
 	main()