如何使用ujson作为Flask编码器/解码器？

我已经看到once可以在Flask应用程序中使用simplejson作为JSON编码器/解码器，如下所示：

from simplejson import JSONEncoder, JSONDecoder

app.json_encoder = JSONEncoder
app.json_decoder = JSONDecoder

但ujson没有这样的对象：

>>> from ujson import JSONEncoder
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: cannot import name 'JSONEncoder' from 'ujson' (/.../site-packages/ujson.cpython-38-x86_64-linux-gnu.so

但我不确定，因为对解码器的帮助表明：

 |  decode(self, s, _w=<built-in method match of re.Pattern object at 0x7f6a608404b0>, _PY3=True)
 |      Return the Python representation of ``s`` (a ``str`` or ``unicode``
 |      instance containing a JSON document)
 |  
 |  raw_decode(self, s, idx=0, _w=<built-in method match of re.Pattern object at 0x7f6a608404b0>, _PY3=True)
 |      Decode a JSON document from ``s`` (a ``str`` or ``unicode``
 |      beginning with a JSON document) and return a 2-tuple of the Python
 |      representation and the index in ``s`` where the document ended.
 |      Optionally, ``idx`` can be used to specify an offset in ``s`` where
 |      the JSON document begins.
 |      
 |      This can be used to decode a JSON document from a string that may
 |      have extraneous data at the end.

---

您可以使用

try

块，如下所示：

import ujson as json
from flask.json import JSONEncoder


class CustomJSONEncoder(JSONEncoder):
    def default(self, obj):
        try:
            return json.dumps(obj)
        except TypeError:
            return JSONEncoder.default(self, obj)


from flask import Flask

app = Flask(__name__)
app.json_encoder = CustomJSONEncoder

另见：

import ujson as json
from flask.json import JSONEncoder


class CustomJSONEncoder(JSONEncoder):
    def default(self, obj):
        try:
            return json.dumps(obj)
        except TypeError:
            return JSONEncoder.default(self, obj)


from flask import Flask

app = Flask(__name__)
app.json_encoder = CustomJSONEncoder