Fix stdio monkey-patching on Python 3.

weasyprint/__main__.py

@@ -67,14 +67,18 @@ def main(argv=None):
                 'output filename that ends in ' + extensions)
 
     if args.input == '-':
-        source = HTML(file_obj=sys.stdin, encoding=args.encoding,
+        stdin = sys.stdin
+        stdin = getattr(stdin, 'buffer', stdin)
+        source = HTML(file_obj=stdin, encoding=args.encoding,
             # Dummy filename in the current directory.
             base_url='<stdin>')
     else:
         source = HTML(args.input, encoding=args.encoding)
 
     if args.output == '-':
-        args.output = sys.stdout
+        stdout = sys.stdout
+        stdout = getattr(stdout, 'buffer', stdout)
+        args.output = stdout
 
     getattr(source, 'write_' + args.format)(
         args.output, stylesheets=args.stylesheet)

weasyprint/compat.py

@@ -23,11 +23,16 @@ Python 2/3 compatibility.
 
 from __future__ import division, unicode_literals
 
+import io
 import sys
 import email
+import contextlib
 
 
-if sys.version_info[0] >= 3:
+PY3 = sys.version_info[0] >= 3
+
+
+if PY3:
     # Python 3
     from urllib.parse import urljoin, urlparse, unquote_to_bytes
     from urllib.request import urlopen, Request
@@ -37,6 +42,7 @@ if sys.version_info[0] >= 3:
     xrange = range
     iteritems = dict.items
 
+
     def urlopen_contenttype(url):
         """Return (file_obj, mime_type, encoding)"""
         result = urlopen(url)
@@ -46,6 +52,7 @@ if sys.version_info[0] >= 3:
         # Using here result.fp gives 'ValueError: read of closed file'
         return result, mime_type, charset
 
+
     def parse_email(data):
         if isinstance(data, bytes):
             data = data.decode('utf8')
@@ -61,9 +68,11 @@ else:
     xrange = xrange
     iteritems = dict.iteritems
 
+
     def array(typecode, initializer):
         return _array(typecode.encode('ascii'), initializer)
 
+
     def urlopen_contenttype(url):
         """Return (file_obj, mime_type, encoding)"""
         result = urlopen(url)
@@ -72,11 +81,13 @@ else:
         charset = info.getparam('charset')
         return result.fp, mime_type, charset
 
+
     def unquote_to_bytes(data):
         if isinstance(data, unicode):
             data = data.encode('ascii')
         return unquote(data)
 
+
     def parse_email(data):
         if isinstance(data, unicode):
             data = data.encode('utf8')

weasyprint/tests/test_api.py

@@ -36,7 +36,7 @@ import pystacia
 
 from .testing_utils import (
     resource_filename, assert_no_logs, TEST_UA_STYLESHEET)
-from ..compat import urljoin
+from ..compat import urljoin, PY3
 from .. import HTML, CSS
 from .. import __main__
 
@@ -86,9 +86,15 @@ def monkey_patch_stdio(input_bytes=b''):
     old_stdin = sys.stdin
     old_stdout = sys.stdout
     try:
-        sys.stdin = io.BytesIO(input_bytes)
+        stdin = io.BytesIO(input_bytes)
-        sys.stdout = io.BytesIO()
+        stdout = io.BytesIO()
-        yield sys.stdout
+        if PY3:
+            sys.stdin = io.TextIOWrapper(stdin)
+            sys.stdout = io.TextIOWrapper(stdout)
+        else:
+            sys.stdin = stdin
+            sys.stdout = stdout
+        yield stdout
     finally:
         sys.stdin = old_stdin
         sys.stdout = old_stdout