WeasyPrint : Type str doesn't support the buffer API

Under Windows, if you type weasyprint http://www.google.com test.pdf and get this message : 

 File "C:\Python34\lib\site-packages\weasyprint\__init__.py", line 293, in _select_source 

    base_url = path2url(filename) 

  File "C:\Python34\lib\site-packages\weasyprint\urls.py", line 87, in path2url 

    path = pathname2url(path) 

  File "C:\Python34\lib\nturl2path.py", line 46, in pathname2url 

    if not ':' in p: 

TypeError: Type str doesn't support the buffer API

You must edit C:\PythonXX\Lib\site-packages\weasyprint\urls.py and comment these lines :

    if isinstance(path, unicode): 

        path = path.encode(FILESYSTEM_ENCODING)