flask为什么要包装json?

原文是这样解释的

on top of that it will delegate access to the current application’s json encoders and decoders for easier customization.

解释定制json输入输出.

一些源码

def jsonify(*args,**kwargs):
    if current_app.config['jsonify_prettyprint_regular'] or current_app.debug:
        indent = 2
        separators = (',',': ')
if args and <a href="https://www.jb51.cc/tag/kwargs/" target="_blank" class="keywords">kwargs</a>:
    raise typeerror('jsonify() behavior undefined when passed both args and <a href="https://www.jb51.cc/tag/kwargs/" target="_blank" class="keywords">kwargs</a>')
elif len(args) == 1:  # single args are passed directly to dumps()
    data = args[0]
else:
    data = args or <a href="https://www.jb51.cc/tag/kwargs/" target="_blank" class="keywords">kwargs</a>

return current_app.response_class(
    (dumps(data,indent=indent,sep<a href="https://www.jb51.cc/tag/ara/" target="_blank" class="keywords">ara</a>tors=sep<a href="https://www.jb51.cc/tag/ara/" target="_blank" class="keywords">ara</a>tors),'\n'),mimetype=current_app.con<a href="https://www.jb51.cc/tag/fig/" target="_blank" class="keywords">fig</a>['jsonify_mimetype']
)
def dumps(obj,kwargs):

_dump_arg_defaults(kwargs)

encoding = kwargs.pop('encoding',none)

rv = _json.dumps(obj,kwargs)

if encoding is not none and isinstance(rv,text_type):

rv = rv.encode(encoding)

return rv
def loads(s,kwargs):

_load_arg_defaults(kwargs)

if isinstance(s,bytes):

s = s.decode(kwargs.pop('encoding',none) or 'utf-8')

return _json.loads(s,kwargs)

可以看出

• 对jsonify对返回值处理一下.

• dumps则必要时转换了编码.

• 同理loads则改要时解码了.