safesort does what it says on the box: guarantees safe sorting of arbitrary heterogeneous lists across Python 2 and Python 3:
>>> list(sorted(["a", 1, None])) Traceback (most recent call last): File "<stdin>", line 1, in <module> TypeError: unorderable types: int() < str() >>> list(safesort(["a", 1, None)) [None, 1, 'a']
Three ordering keys are attempted for each comparison:
Object: objA > objB
Type-and-object: (type(objA).__mro__, objA) > (type(objB).__mro__, objB)
Type-and-identity: (type(objA).__mro__, id(objA)) > (type(objB).__mro__, id(objB))
This guarantees a total ordering which is:
As consistent as possible
Broadly sensible: objects with similar types will be grouped together
For example:
>>> from safesort import safesort
>>> input = ['a', set([]), [], {}, 1, None]
>>> list(safesort(input))
[None, 1, {}, [], set([]), 'a']
Installation
safesort can be installed with Python 2 or Python 3 using pip or easy_install:
$ pip install safesort - OR - $ easy_install safesort
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