Message257579
It looks like the behaviour of set displays do not match behaviour in some cases. The documentation states:
"A set display yields a new mutable set object, the contents being specified by either a sequence of expressions or a comprehension. When a comma-separated list of expressions is supplied, its elements are evaluated from left to right and added to the set object. When a comprehension is supplied, the set is constructed from the elements resulting from the comprehension."
Note the following:
>>> foo = { True, 1 }
>>> print(foo)
{1}
However, if we add elements 'left to right':
>>> foo = set()
>>> foo.add(True)
>>> foo.add(1)
>>> print(foo)
{True}
Note that similar documentation for dict displays produces the expected result.
"If a comma-separated sequence of key/datum pairs is given, they are evaluated from left to right to define the entries of the dictionary: each key object is used as a key into the dictionary to store the corresponding datum. This means that you can specify the same key multiple times in the key/datum list, and the final dictionary’s value for that key will be the last one given."
>>> foo = {}
>>> foo[True] = 'bar'
>>> foo[1] = 'baz'
>>> print(foo)
{True: 'baz'}
Which matches the dict display construction:
>>> foo = { True: 'bar', 1: 'baz'}
>>> print(foo)
{True: 'baz'}
Note that I've tagged this as a documentation bug, but it seems like the documentation might be the preferred implementation. |
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Date |
User |
Action |
Args |
2016-01-06 02:42:21 | Hamish Campbell | set | recipients:
+ Hamish Campbell, docs@python |
2016-01-06 02:42:21 | Hamish Campbell | set | messageid: <1452048141.82.0.22346371212.issue26020@psf.upfronthosting.co.za> |
2016-01-06 02:42:21 | Hamish Campbell | link | issue26020 messages |
2016-01-06 02:42:20 | Hamish Campbell | create | |
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