Explicitly specify encoding when opening text files in Python code

contrib/devtools/test-security-check.py

@@ -10,7 +10,7 @@ import sys
 import unittest
 
 def write_testcode(filename):
-    with open(filename, 'w') as f:
+    with open(filename, 'w', encoding="utf8") as f:
         f.write('''
     #include <stdio.h>
     int main()

contrib/linearize/linearize-data.py

@@ -71,7 +71,7 @@ def get_blk_dt(blk_hdr):
 
 def get_block_hashes(settings):
 	blkindex = []
-	f = open(settings['hashlist'], "r")
+	f = open(settings['hashlist'], "r", encoding="utf8")
 	for line in f:
 		line = line.rstrip()
 		blkindex.append(line)
@@ -251,7 +251,7 @@ if __name__ == '__main__':
 		print("Usage: linearize-data.py CONFIG-FILE")
 		sys.exit(1)
 
-	f = open(sys.argv[1])
+	f = open(sys.argv[1], encoding="utf8")
 	for line in f:
 		# skip comment lines
 		m = re.search('^\s*#', line)

contrib/linearize/linearize-hashes.py

@@ -79,7 +79,7 @@ if __name__ == '__main__':
 		print("Usage: linearize-hashes.py CONFIG-FILE")
 		sys.exit(1)
 
-	f = open(sys.argv[1])
+	f = open(sys.argv[1], encoding="utf8")
 	for line in f:
 		# skip comment lines
 		m = re.search('^\s*#', line)

contrib/seeds/generate-seeds.py

@@ -126,10 +126,10 @@ def main():
     g.write(' * Each line contains a 16-byte IPv6 address and a port.\n')
     g.write(' * IPv4 as well as onion addresses are wrapped inside a IPv6 address accordingly.\n')
     g.write(' */\n')
-    with open(os.path.join(indir,'nodes_main.txt'),'r') as f:
+    with open(os.path.join(indir,'nodes_main.txt'),'r', encoding="utf8") as f:
         process_nodes(g, f, 'pnSeed6_main', 8233)
     g.write('\n')
-    with open(os.path.join(indir,'nodes_test.txt'),'r') as f:
+    with open(os.path.join(indir,'nodes_test.txt'),'r', encoding="utf8") as f:
         process_nodes(g, f, 'pnSeed6_test', 18233)
     g.write('#endif // BITCOIN_CHAINPARAMSSEEDS_H\n')