Merge pull request #366 from cclauss/patch-1

long(), print(), xrange() for Python 3

code/bip-table.py

@@ -17,15 +17,15 @@ while (line[0] != "|"):
     line = f.readline()
 
 while (line[1] == '-'):
-    line_num =  f.readline()
-    line_layer =  f.readline()[2:-1]
-    line_title =  f.readline()[2:-1]
-    line_owner =  f.readline()[2:-1]
-    line_type =  f.readline()[2:-1]
+    line_num = f.readline()
+    line_layer = f.readline()[2:-1]
+    line_title = f.readline()[2:-1]
+    line_owner = f.readline()[2:-1]
+    line_type = f.readline()[2:-1]
     line_status = f.readline()[2:-1]
-    line =  f.readline()
+    line = f.readline()
     while (line[0] != "|"):
-        line =  f.readline()
+        line = f.readline()
 
     num = regex_num.match(line_num)
     alt_num = regex_altnum.match(line_num)
@@ -34,6 +34,10 @@ while (line[1] == '-'):
     elif alt_num:
         bip_num = alt_num.group(1)
 
-    print "|[[bip-{0}]]https://github.com/bitcoin/bips/blob/master/bip-{0:04d}.mediawiki[BIP-{0}] |{1} |{2} |{3} |{4} ".format(int(bip_num), line_title, line_owner, line_type, line_status)
-
+    print("|[[bip-{0}]]https://github.com/bitcoin/bips/blob/master/bip-{0:04d}"
+          ".mediawiki[BIP-{0}] |{1} |{2} |{3} |{4} ".format(int(bip_num),
+                                                            line_title,
+                                                            line_owner,
+                                                            line_type,
+                                                            line_status))
 f.close()

code/get-utxo.py

@@ -25,4 +25,7 @@ resp = requests.get('https://blockchain.info/unspent?active=%s' % address)
 utxo_set = json.loads(resp.text)["unspent_outputs"]
 
 for utxo in utxo_set:
-    print "%s:%d - %ld Satoshis" % (utxo['tx_hash'], utxo['tx_output_n'], utxo['value'])
+    print("%s:%d - %ld Satoshis" % (utxo['tx_hash'], utxo['tx_output_n'],
+                                    utxo['value']))
+    # Or try...
+    # print("{tx_hash}:{tx_output_n} - {value} Satoshis".format(**utxo))

code/hash_example.py

@@ -6,7 +6,7 @@ import hashlib
 text = "I am Satoshi Nakamoto"
 
 # iterate nonce from 0 to 19
-for nonce in xrange(20): 
+for nonce in range(20): 
     
     # add the nonce to the end of the text
     input = text + str(nonce) 
@@ -15,4 +15,4 @@ for nonce in xrange(20):
     hash = hashlib.sha256(input).hexdigest() 
     
     # show the input and hash result
-    print input, '=>',  hash 
+    print(input, '=>',  hash)

code/key-to-address-ecc-example.py

@@ -5,45 +5,41 @@ valid_private_key = False
 while not valid_private_key:
     private_key = bitcoin.random_key()
     decoded_private_key = bitcoin.decode_privkey(private_key, 'hex')
-    valid_private_key =  0 < decoded_private_key < bitcoin.N
+    valid_private_key = 0 < decoded_private_key < bitcoin.N
 
-print "Private Key (hex) is: ", private_key
-print "Private Key (decimal) is: ", decoded_private_key
+print("Private Key (hex) is: ", private_key)
+print("Private Key (decimal) is: ", decoded_private_key)
 
 # Convert private key to WIF format
 wif_encoded_private_key = bitcoin.encode_privkey(decoded_private_key, 'wif')
-print "Private Key (WIF) is: ", wif_encoded_private_key
+print("Private Key (WIF) is: ", wif_encoded_private_key)
 
 # Add suffix "01" to indicate a compressed private key
 compressed_private_key = private_key + '01'
-print "Private Key Compressed (hex) is: ", compressed_private_key
+print("Private Key Compressed (hex) is: ", compressed_private_key)
 
 # Generate a WIF format from the compressed private key (WIF-compressed)
 wif_compressed_private_key = bitcoin.encode_privkey(
     bitcoin.decode_privkey(compressed_private_key, 'hex'), 'wif')
-print "Private Key (WIF-Compressed) is: ", wif_compressed_private_key
+print("Private Key (WIF-Compressed) is: ", wif_compressed_private_key)
 
 # Multiply the EC generator point G with the private key to get a public key point
 public_key = bitcoin.fast_multiply(bitcoin.G, decoded_private_key)
-print "Public Key (x,y) coordinates is:", public_key
+print("Public Key (x,y) coordinates is:", public_key)
 
 # Encode as hex, prefix 04
-hex_encoded_public_key = bitcoin.encode_pubkey(public_key,'hex')
-print "Public Key (hex) is:", hex_encoded_public_key
+hex_encoded_public_key = bitcoin.encode_pubkey(public_key, 'hex')
+print("Public Key (hex) is:", hex_encoded_public_key)
 
 # Compress public key, adjust prefix depending on whether y is even or odd
 (public_key_x, public_key_y) = public_key
-if (public_key_y % 2) == 0:
-    compressed_prefix = '02'
-else:
-    compressed_prefix = '03'
+compressed_prefix = '02' if (public_key_y % 2) == 0 else '03'
 hex_compressed_public_key = compressed_prefix + bitcoin.encode(public_key_x, 16)
-print "Compressed Public Key (hex) is:", hex_compressed_public_key
+print("Compressed Public Key (hex) is:", hex_compressed_public_key)
 
 # Generate bitcoin address from public key
-print "Bitcoin Address (b58check) is:", bitcoin.pubkey_to_address(public_key)
+print("Bitcoin Address (b58check) is:", bitcoin.pubkey_to_address(public_key))
 
 # Generate compressed bitcoin address from compressed public key
-print "Compressed Bitcoin Address (b58check) is:", \
-    bitcoin.pubkey_to_address(hex_compressed_public_key)
-
+print("Compressed Bitcoin Address (b58check) is:",
+      bitcoin.pubkey_to_address(hex_compressed_public_key))

code/max_money.py

@@ -3,6 +3,7 @@ start_block_reward = 50
 # 210000 is around every 4 years with a 10 minute block interval
 reward_interval = 210000
 
+
 def max_money():
     # 50 BTC = 50 0000 0000 Satoshis
     current_reward = 50 * 10**8
@@ -12,5 +13,5 @@ def max_money():
         current_reward /= 2
     return total
 
-print "Total BTC to ever be created:", max_money(), "Satoshis"
 
+print("Total BTC to ever be created:", max_money(), "Satoshis")

code/proof-of-work-example.py

@@ -4,60 +4,61 @@
 import hashlib
 import time
 
-max_nonce = 2 ** 32 # 4 billion
+try:
+    long        # Python 2
+    xrange
+except NameError:
+    long = int  # Python 3
+    xrange = range
+
+max_nonce = 2 ** 32  # 4 billion
+
 
 def proof_of_work(header, difficulty_bits):
-    
     # calculate the difficulty target
-    target = 2 ** (256-difficulty_bits)
-    
+    target = 2 ** (256 - difficulty_bits)
+
     for nonce in xrange(max_nonce):
-        hash_result = hashlib.sha256(str(header)+str(nonce)).hexdigest()
-        
+        hash_result = hashlib.sha256(str(header) + str(nonce)).hexdigest()
+
         # check if this is a valid result, below the target
         if long(hash_result, 16) < target:
-            print "Success with nonce %d" % nonce
-            print "Hash is %s" % hash_result
-            return (hash_result,nonce)
-            
-    print "Failed after %d (max_nonce) tries" % nonce
+            print("Success with nonce %d" % nonce)
+            print("Hash is %s" % hash_result)
+            return (hash_result, nonce)
+
+    print("Failed after %d (max_nonce) tries" % nonce)
     return nonce
 
-    
+
 if __name__ == '__main__':
-    
     nonce = 0
     hash_result = ''
-     
-    # difficulty from 0 to 31 bits  
+
+    # difficulty from 0 to 31 bits
     for difficulty_bits in xrange(32):
-        
         difficulty = 2 ** difficulty_bits
-        print "Difficulty: %ld (%d bits)" % (difficulty, difficulty_bits)
-    
-        print "Starting search..."
-        
+        print("Difficulty: %ld (%d bits)" % (difficulty, difficulty_bits))
+        print("Starting search...")
+
         # checkpoint the current time
         start_time = time.time()
-        
+
         # make a new block which includes the hash from the previous block
         # we fake a block of transactions - just a string
-        new_block = 'test block with transactions' + hash_result 
-        
+        new_block = 'test block with transactions' + hash_result
+
         # find a valid nonce for the new block
-        (hash_result, nonce) = proof_of_work(new_block, difficulty_bits) 
-        
+        (hash_result, nonce) = proof_of_work(new_block, difficulty_bits)
+
         # checkpoint how long it took to find a result
         end_time = time.time()
-        
+
         elapsed_time = end_time - start_time
-        print "Elapsed Time: %.4f seconds" % elapsed_time
-    
+        print("Elapsed Time: %.4f seconds" % elapsed_time)
+
         if elapsed_time > 0:
-            
+
             # estimate the hashes per second
-            hash_power = float(long(nonce)/elapsed_time)
-            print "Hashing Power: %ld hashes per second" % hash_power
-    
-    
-    
+            hash_power = float(long(nonce) / elapsed_time)
+            print("Hashing Power: %ld hashes per second" % hash_power)

code/select-utxo.py

@@ -2,8 +2,13 @@
 
 from sys import argv
 
-class OutputInfo:
+try:
+    long        # Python 2
+except NameError:
+    long = int  # Python 3
+
 
+class OutputInfo:
     def __init__(self, tx_hash, tx_index, value):
         self.tx_hash = tx_hash
         self.tx_index = tx_index
@@ -13,6 +18,7 @@ class OutputInfo:
         return "<%s:%s with %s Satoshis>" % (self.tx_hash, self.tx_index,
                                              self.value)
 
+
 # Select optimal outputs for a send from unspent outputs list.
 # Returns output list and remaining change to be sent to
 # a change address.
@@ -44,6 +50,7 @@ def select_outputs_greedy(unspent, min_value):
     # No results found.
     return None, 0
 
+
 def main():
     unspent = [
         OutputInfo("ebadfaa92f1fd29e2fe296eda702c48bd11ffd52313e986e99ddad9084062167", 1,  8000000),
@@ -54,15 +61,11 @@ def main():
         OutputInfo("12b6a7934c1df821945ee9ee3b3326d07ca7a65fd6416ea44ce8c3db0c078c64", 0,  10000000),
         OutputInfo("7f42eda67921ee92eae5f79bd37c68c9cb859b899ce70dba68c48338857b7818", 0,  16100000),
     ]
-    
-    if len(argv) > 1: 
-        target = long(argv[1])
-    else:
-        target = 55000000
-        
-    print "For transaction amount %d Satoshis (%f bitcoin) use: " % (target, target/10.0**8)
-    print select_outputs_greedy(unspent, target)
+    target = long(argv[1]) if len(argv) > 1 else 55000000
+    print("For transaction amount %d Satoshis (%f bitcoin) use: " %
+          (target, target / 10.0 ** 8))
+    print(select_outputs_greedy(unspent, target))
+
 
 if __name__ == "__main__":
     main()
-