Numpy Typehint with nptyping and Array in PyCharm

Question

I try to use numpy with nptyping's Array to do my typehinting.

I tried the following:

enemy_hand: Array[float, 48] = np.zeros(48)

I get an typerror:

Expected Type 'Array[float, Any]', got 'ndarray' instead

as far as I understand from this: https://pypi.org/project/nptyping/ thats how it should look.

What line gives you that error? type hinting is only for the user. Also I tried to replicate your problem but isinstance gives the expected outputs. Please update your question to include some more information about the error and how you're encountering it — sshashank124
– sshashank124, Commented Jan 14, 2020 at 7:22
@sshashank124 as pointed out in a comment on my deleted answer, asker is trying to do Variable Annotation — Daniel F
– Daniel F, Commented Jan 14, 2020 at 7:51

user2357112 · Accepted Answer · 2020-01-14 08:10:55Z

8

+50

nptyping is currently useless for static analysis. Quoting a post by the library's developer on its issue tracker,

mypy is just not supported by nptyping (yet)

I wouldn't put much hope in that "yet". NumPy's dtype and shape handling is very hard to fit into the typing/mypy static type model, and nptyping's own design decisions are a poor fit for NumPy itself. For example, it doesn't look like the dev ever considered arrays that aren't 2D, so Array[str, 3] represents a 2D array with 3 rows and unspecified columns instead of a 3-element 1D array. All the implementation is in terms of rows and columns, too.

As far as I can tell, the only real functionality nptyping has is isinstance checks, and even that's buggy.

edited Jan 14, 2020 at 8:10

answered Jan 14, 2020 at 7:50

user2357112

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4 Comments

user2357112 Over a year ago

@NameVergessen: No. Like I said, NumPy's dtype and shape handling is a very poor match for the typing/mypy type system.

NameVergessen Over a year ago

as far as i can tell the yet isn't here (yet).

Gulzar Over a year ago

FYI, Still not yet

Ziyuan Over a year ago

For nptyping 2.x, mypy can detect array vs non-array but cannot detect shape/dimension label mismatch.

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