Parsing a list of integers in flask-restful

You can use action='append'. For example:

parser.add_argument('integer_list', type=int, action='append')

Pass multiple integer parameters:

curl http://api.example.com -d "integer_list=1" -d "integer_list=2" -d "integer_list=3"

And you will get a list of integers:

args = parser.parse_args()
args['integer_list'] # [1, 2, 3]

An invalid request will automatically get a 400 Bad Request response.

You cannot in fact. Since you can pass a list with multiple kinds of types, e.g. [1, 2, 'a', 'b'], with reqparser, you can only parse with type=list. You need to check the elements of the list one by one by yourself. The code looks like below:

parse_result = parser.add_argument('integer_list', type=list, location='json')
your_list = parse_result.get('integer_list', [])
for element in your_list: 
    if isinstance(element, int): 
        # do something
        print "element is int"
    else:
        # do something else
        print "element is not int"