Indeed, looks like to come from IPython (not Python) :
$ sage -python
Python 2.7.10 (default, Apr 1 2016, 01:03:57)
[GCC 4.9.3] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> set([1])
set([1])
>>>
$ sage -ipython
Python 2.7.10 (default, Apr 1 2016, 01:03:57)
Type "copyright", "credits" or "license" for more information.
IPython 4.1.2 -- An enhanced Interactive Python.
? -> Introduction and overview of IPython's features.
%quickref -> Quick reference.
help -> Python's own help system.
object? -> Details about 'object', use 'object??' for extra details.
In [1]: set([1])
Out[1]: {1}
In [2]: set([])
Out[2]: set()
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