py3 fetch command: it may actually be better to try to print bytes as-is

scrapy/commands/fetch.py

@@ -1,11 +1,11 @@
 from __future__ import print_function
+import sys, six
 from w3lib.url import is_url
 
 from scrapy.commands import ScrapyCommand
 from scrapy.http import Request
 from scrapy.exceptions import UsageError
 from scrapy.utils.spider import spidercls_for_request, DefaultSpider
-from scrapy.utils.python import to_unicode
 
 class Command(ScrapyCommand):
 
@@ -29,10 +29,10 @@ class Command(ScrapyCommand):
             help="print response HTTP headers instead of body")
 
     def _print_headers(self, headers, prefix):
+        prefix = prefix.encode()
         for key, values in headers.items():
             for value in values:
-                print('%s %s: %s' % (
-                      prefix, to_unicode(key), to_unicode(value)))
+                self._print_bytes(prefix + b' ' + key + b': ' + value)
 
     def _print_response(self, response, opts):
         if opts.headers:
@@ -40,7 +40,11 @@ class Command(ScrapyCommand):
             print('>')
             self._print_headers(response.headers, '<')
         else:
-            print(to_unicode(response.body))
+            self._print_bytes(response.body)
+
+    def _print_bytes(self, bytes_):
+        bytes_writer = sys.stdout if six.PY2 else sys.stdout.buffer
+        bytes_writer.write(bytes_ + b'\n')
 
     def run(self, args, opts):
         if len(args) != 1 or not is_url(args[0]):