Josh Rosenberg added the comment:
As a workaround (should you absolutely need to sort keys by some arbitrary
criteria), you can initialize a collections.OrderedDict from the sorted items
of your original dict (using whatever key function you like), then dump without
using sort_keys=True. For example, your suggested behavior (treat all keys as
str) could be achieved by the user by replacing:
json.dumps(mydict, sort_keys=True)
with:
json.dumps(collections.OrderedDict(sorted(mydict.items(), key=str)))
Particularly in 3.5 (where OrderedDict is a C builtin), this shouldn't incur
too much additional overhead (`sort_keys` has to make a sorted list
intermediate anyway), and the output is the same, without introducing implicit
hiding of errors.
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue25457>
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