bpo-33684: json.tool: Use utf-8 for infile and outfile.

Author: methane

Lib/json/tool.py

@@ -20,10 +20,12 @@ def main():
     description = ('A simple command line interface for json module '
                    'to validate and pretty-print JSON objects.')
     parser = argparse.ArgumentParser(prog=prog, description=description)
-    parser.add_argument('infile', nargs='?', type=argparse.FileType(),
+    parser.add_argument('infile', nargs='?',
+                        type=argparse.FileType(encoding="utf-8"),
                         help='a JSON file to be validated or pretty-printed',
                         default=sys.stdin)
-    parser.add_argument('outfile', nargs='?', type=argparse.FileType('w'),
+    parser.add_argument('outfile', nargs='?',
+                        type=argparse.FileType('w', encoding="utf-8"),
                         help='write the output of infile to outfile',
                         default=sys.stdout)
     parser.add_argument('--sort-keys', action='store_true', default=False,