使用Flask發送靜態文件會引發UnicodeDecodeError

Question

我正在嘗試鏈接到Flask中的靜態CSS文件。 但是，靜態路由會引發UnicodeDecodeError: 'ascii' codec can't decode byte 0xe5 in position 8: ordinal not in range(128)嘗試發送文件時， UnicodeDecodeError: 'ascii' codec can't decode byte 0xe5 in position 8: ordinal not in range(128) 。 為什么會出現此錯誤，我該如何解決？

<link rel="stylesheet" type="text/css" href="{{ url_for('static', filename='content/alpin.css') }}"/>

Traceback (most recent call last):
  File "C:\Python27\lib\site-packages\flask-0.10.1-py2.7.egg\flask\app.py", line 1836, in __call__
    return self.wsgi_app(environ, start_response)
  File "C:\Python27\lib\site-packages\flask-0.10.1-py2.7.egg\flask\app.py", line 1820, in wsgi_app
    response = self.make_response(self.handle_exception(e))
  File "C:\Python27\lib\site-packages\flask-0.10.1-py2.7.egg\flask\app.py", line 1403, in handle_exception
    reraise(exc_type, exc_value, tb)
  File "C:\Python27\lib\site-packages\flask-0.10.1-py2.7.egg\flask\app.py", line 1817, in wsgi_app
    response = self.full_dispatch_request()
  File "C:\Python27\lib\site-packages\flask-0.10.1-py2.7.egg\flask\app.py", line 1477, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "C:\Python27\lib\site-packages\flask-0.10.1-py2.7.egg\flask\app.py", line 1381, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "C:\Python27\lib\site-packages\flask-0.10.1-py2.7.egg\flask\app.py", line 1475, in full_dispatch_request
    rv = self.dispatch_request()
  File "C:\Python27\lib\site-packages\flask-0.10.1-py2.7.egg\flask\app.py", line 1461, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "C:\Python27\lib\site-packages\flask-0.10.1-py2.7.egg\flask\helpers.py", line 822, in send_static_file
    cache_timeout=cache_timeout)
  File "C:\Python27\lib\site-packages\flask-0.10.1-py2.7.egg\flask\helpers.py", line 612, in send_from_directory
    filename = safe_join(directory, filename)
  File "C:\Python27\lib\site-packages\flask-0.10.1-py2.7.egg\flask\helpers.py", line 582, in safe_join
    return os.path.join(directory, filename)
  File "C:\Python27\lib\ntpath.py", line 85, in join
    result_path = result_path + p_path
UnicodeDecodeError: 'ascii' codec can't decode byte 0xe5 in position 8: ordinal not in range(128)

Answer 1

正如Python追溯告訴您的那樣，存在一個UnicodeDecodeError 。

我希望它來自您對render_template Flask函數的render_template 。
render_template函數使用Jinja，它需要Unicode字符串。

默認情況下，Python 2.x中的字符串是字節字符串。
要將其更改為Unicode，請使用：

>>> byte_string = 'I have a non-ASCII character: €'
>>> type(byte_string)
<type 'str'>
>>> unicode_string = byte_string.decode('utf-8')
>>> type(unicode_string)
<type 'unicode'>

具體來說，您可以做的是：

• 將您傳遞給render_template的字符串轉換為Unicode

• 默認情況下通過使用啟用Unicode字符串

   import sys reload(sys) sys.setdefaultencoding("utf-8") 

  不過，這不是最安全的選擇（請參閱此處 ）

如果是用於新項目，則可以直接使用Python 3，默認情況下使用Unicode。