Python - ValueError: dictionary update sequence element #0 has length 15; 2 is required

Question

I am using Zeep to try and interact with a SOAP client on SellerCloud. When I pass in my argument for one of the API's operations, I get hit with a ValueError -

ValueError: dictionary update sequence element #0 has length 15; 2 is required

Here is the relevant code:

from zeep import Client
import datetime

wsdl_url = "http://tt.ws.sellercloud.com/scservice.asmx?WSDL"
client = Client(wsdl_url)
auth_type = client.get_type("ns0:AuthHeader")
sc_auth = auth_type(UserName=<username>, Password=<password>)

from_date = datetime.date(2018, 7, 3).strftime("%Y-%m-%d %H:%M:%S")
to_date = datetime.date(2018, 7, 11).strftime("%Y-%m-%d %H:%M:%S")

sc_keys = ["DateFrom", "DateTo", "UseSP", "ShippingStatusKind", "IncludeDS"]
sc_values = [from_date, to_date, "GET", "1", "TRUE"]

filters_type = client.get_type("ns0:SerializableDictionaryOfStringString")
filters = filters_type(sc_keys, sc_values)

print filters
print 'length of filters - ', len(filters)

with client.settings(extra_http_headers=sc_auth, force_https=False):
  order_ids = client.service.Orders_Get(filters)

And the stack trace error -

Traceback (most recent call last):
  File "seller-cloud.py", line 24, in <module>
    order_ids = client.service.Orders_Get(filters)
  File "/home/user/Envs/seller-cloud/local/lib/python2.7/site-packages/zeep/proxy.py", line 42, in __call__
    self._op_name, args, kwargs)
  File "/home/user/Envs/seller-cloud/local/lib/python2.7/site-packages/zeep/wsdl/bindings/soap.py", line 121, in send
    options=options)
  File "/home/user/Envs/seller-cloud/local/lib/python2.7/site-packages/zeep/wsdl/bindings/soap.py", line 99, in _create
    http_headers.update(client.settings.extra_http_headers)
ValueError: dictionary update sequence element #0 has length 15; 2 is required

And the output of my print statements prior to where the error is happening -

{
    'Keys': [
        'DateFrom',
        'DateTo',
        'UseSP',
        'ShippingStatusKind',
        'IncludeDS'
    ],
    'Values': [
        '2018-07-03 00:00:00',
        '2018-07-11 00:00:00',
        'GET',
        '1',
        'TRUE'
    ]
}
length of filters -  2

I've been banging my head on this for a while but can't seem to find where this whole length of 15 deal is happening. Even if I pass in an empty array like : filters = filters_type([]), I still get a length of 15 error.

My guess, and it's hard to say from this example, but I think the filters need to be passed as a dictionary of key-value pairs. i.e. `{'DateFrom': '2018...'}` — pypypy, Oct 16 '18 at 22:43
Yeah, I tried that as well. Passing a dictionary directly into `client.service.Orders_Get(filters)` and bypassing the `filters_type` step gives the same error. — demluckycharms, Oct 16 '18 at 22:47

score 1 · Accepted Answer · answered Oct 16 '18 at 22:56

1

Based on the traceback it is failing when updating HTTP headers here:

http_headers.update(client.settings.extra_http_headers)

I would investigate if extra_http_headers=sc_auth sets the right headers. It looks like you need to pass there plain HTTP headers (a dict) and you are giving it some SOAP structure.

answered Oct 16 '18 at 22:56

Santiago Bruno

461
2
9

Looks like that might be it. Now I'm running into a new problem, though. The `client.service.Orders_Get()` apparently needs the specific SOAP structure to authenticate properly, which from the API's docs looks like `Orders_Get(SCAuth, SCSettings, filters)`. Unfortunately, passing in more than one argument here throws an error saying only one argument is allowed. – demluckycharms Oct 16 '18 at 23:07
1

Error message stating need for auth in the method call - `zeep.exceptions.Fault: System.Web.Services.Protocols.SoapException: Server was unable to process request. ---> System.Exception: Please provide authentication information in AuthHeaderValue property of service object.` – demluckycharms Oct 16 '18 at 23:11
1

Not sure. Take a look at this docs: https://python-zeep.readthedocs.io/en/master/headers.html Probably you need to call `Orders_Get` with `_soapheaders` named parameter and the auth information you have. – Santiago Bruno Oct 16 '18 at 23:17
Using the `_soapheaders` definitely helps. Looks like the authentication process is now starting correctly. Sure enough, now I'm getting told my username is invalid - despite it being copy / pasted. That's a problem that can't really be fixed though, so I'll be marking your solution as correct! Thanks! – demluckycharms Oct 17 '18 at 16:15

Python - ValueError: dictionary update sequence element #0 has length 15; 2 is required

1 Answers1