> More importantly though, allowing your proposed semantics would cause a
lot of silent bugs in code like `if arr == value`, which would be silently
true of array inputs. We already diverge from python on what == means, so I
see no reason to match the normal semantics of bool.
Eric hits the nail r
Defining falseness as emptiness in numpy is problematic, as then
bool(array(0)) and bool(0) would have different results. 0d arrays are
supposed to behave as much like their scalar values as possible, so this is
not acceptable.
More importantly though, allowing your proposed semantics would cause
On 2017/08/18 11:45 AM, Michael Lamparski wrote:
Greetings, all. I am troubled.
The TL;DR is that `bool(array([])) is False` is misleading, dangerous,
and unnecessary. Let's begin with some examples:
>>> bool(np.array(1))
True
>>> bool(np.array(0))
False
>>> bool(np.array([0, 1]))
ValueEr
On Fri, Aug 18, 2017 at 2:45 PM, Michael Lamparski
wrote:
> Greetings, all. I am troubled.
>
> The TL;DR is that `bool(array([])) is False` is misleading, dangerous, and
> unnecessary. Let's begin with some examples:
>
bool(np.array(1))
> True
bool(np.array(0))
> False
bool(np.arra
I'm also in favor of fixing this, although we might need a deprecation
cycle with a warning advising to use arr.size in future to detect emptiness
- just in case anyone is using it.
On Sat, Aug 19, 2017, 06:01 Stephan Hoyer wrote:
> I agree, this behavior seems actively harmful. Let's fix it.
>
> But I would have expected these to raise ValueErrors recommending any()
and all():
> >>> bool(np.array([1]))
> True
> >>> bool(np.array([0]))
> False
While I can't confess to know the *actual* reason why single-element arrays
evaluate the way they do, this is how I understand it:
One thing that
Maybe I'm missing something.
This seems fine to me:
>>> bool(np.array([]))
False
But I would have expected these to raise ValueErrors recommending any() and
all():
>>> bool(np.array([1]))
True
>>> bool(np.array([0]))
False
On Fri, Aug 18, 2017 at 3:00 PM, Stephan Hoyer wrote:
> I agree, this b
I agree, this behavior seems actively harmful. Let's fix it.
On Fri, Aug 18, 2017 at 2:45 PM, Michael Lamparski wrote:
> Greetings, all. I am troubled.
>
> The TL;DR is that `bool(array([])) is False` is misleading, dangerous, and
> unnecessary. Let's begin with some examples:
>
> >>> bool(np.a
Greetings, all. I am troubled.
The TL;DR is that `bool(array([])) is False` is misleading, dangerous, and
unnecessary. Let's begin with some examples:
>>> bool(np.array(1))
True
>>> bool(np.array(0))
False
>>> bool(np.array([0, 1]))
ValueError: The truth value of an array with more than one elem
Hi All,
I am happy to announce the **beta** release of NetworkX 2.0! NetworkX
is a Python package for the creation, manipulation, and study of the
structure, dynamics, and functions of complex networks.
This release supports Python 2.7 and 3.4-3.6 and contains many new
features. This release is
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