How can I pass in numpy array to Flask API?

Question

How can I use webargs or reqparse from flask_restful to pass a numpy array while making a POST call. I am able to pass arguments of other data types (string, int) with ease but numpy arrays get translated to unicode or throws an error.

I want to able to do something like:

from flask_restful import reqparse
parser = reqparse.RequestParser()
parser.add_argument('url', type=str)
parser.add_argument('id', type=str, required=True)
# Pass in numpy array
parser.add_argument('arr', type=numpy.array, required=True)

I also tried with webargs but haven't found a way to make it compatible with numpy arrays. I have this set up:

from webargs import fields
from webargs.flaskparser import use_args
my_args = {'url': fields.Str(),
           'id': fields.Str(required=True),
           'arr': fields.Field()} # not sure what to put here

Is there a way to efficiently pass in a numpy array using a flask restful API?

Edit: I've tried setting data type as List but get a new error indicating u"'List' object is not callable". I've changed:

# pass in numpy array
parser.add_argument('arr', type=fields.List(fields.Raw()))

Hi! Did you manage to figure this out? Currently experiencing this problem — CarterB
– CarterB, Commented Mar 31, 2021 at 11:55

Angelo Mendes · Accepted Answer · 2019-04-09 17:21:11Z

-1

The documentation indicates some other data types than primitives. A numpy array can be interpreted as a list.

If you want to pass a numpy object to be able to use its methods, I think the parser will not work.

answered Apr 9, 2019 at 17:21

Angelo Mendes

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