[docs] [issue16057] Subclasses of JSONEncoder should not be insturcted to call JSONEncoder.decode

Wed Sep 26 23:40:43 CEST 2012

New submission from Justin Lebar:
The JSONEncoder documentation says we can implement our own encoder as:
 >>> class ComplexEncoder(json.JSONEncoder):
 ... def default(self, obj):
 ... if isinstance(obj, complex):
 ... return [obj.real, obj.imag]
 ... return json.JSONEncoder.default(self, obj)
Later on, we give the following example of how to implement the default method in a subclass of json.JSONEncoder:
 def default(self, o):
 try:
 iterable = iter(o)
 except TypeError:
 pass
 else:
 return list(iterable)
 return JSONEncoder.default(self, o)
These are both incorrect, as a quick reading of the source will reveal. JSONEncoder.default() throws for all input values. We should s/JSONEncoder.default/JSONEncoder.encode/ here, I think.
----------
assignee: docs at python
components: Documentation
messages: 171363
nosy: Justin.Lebar, docs at python
priority: normal
severity: normal
status: open
title: Subclasses of JSONEncoder should not be insturcted to call JSONEncoder.decode
versions: Python 2.7
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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue16057>
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