How to send an array using requests.post (Python)? "Value Error: Too many values to unpack"
PythonPython RequestsPython Problem Overview
I'm trying to send an array(list) of requests to the WheniWork API using requests.post, and I keep getting one of two errors. When I send the list as a list, I get an unpacking error, and when I send it as a string, I get an error asking me to submit an array. I think it has something to do with how requests handles lists. Here are the examples:
url='https://api.wheniwork.com/2/batch'
headers={"W-Token": "Ilovemyboss"}
data=[{'url': '/rest/shifts', 'params': {'user_id': 0,'other_stuff':'value'}, 'method':'post',{'url': '/rest/shifts', 'params': {'user_id': 1,'other_stuff':'value'}, 'method':'post'}]
r = requests.post(url, headers=headers,data=data)
print r.text
# ValueError: too many values to unpack
Simply wrapping the value for data in quotes:
url='https://api.wheniwork.com/2/batch'
headers={"W-Token": "Ilovemyboss"}
data="[]" #removed the data here to emphasize that the only change is the quotes
r = requests.post(url, headers=headers,data=data)
print r.text
#{"error":"Please include an array of requests to make.","code":5000}
Python Solutions
Solution 1 - Python
You want to pass in JSON encoded data. See the API documentation:
> Remember — All post bodies must be JSON encoded data (no form data).
The requests
library makes this trivially easy:
headers = {"W-Token": "Ilovemyboss"}
data = [
{
'url': '/rest/shifts',
'params': {'user_id': 0, 'other_stuff': 'value'},
'method': 'post',
},
{
'url': '/rest/shifts',
'params': {'user_id': 1,'other_stuff': 'value'},
'method':'post',
},
]
requests.post(url, json=data, headers=headers)
By using the json
keyword argument the data is encoded to JSON for you, and the Content-Type
header is set to application/json
.
Solution 2 - Python
Well, It turns out that all I needed to do was add these headers:
headers = {'Content-Type': 'application/json', 'Accept':'application/json'}
and then call requests
requests.post(url,data=json.dumps(payload), headers=headers)
and now i'm good!
Solution 3 - Python
Always remember when sending an array(list) or dictionary in the HTTP POST request, do use json argument in the post function and set its value to your array(list)/dictionary.
In your case it will be like:
> r = requests.post(url, headers=headers, json=data)
Note: POST requests implicitly convert parameter's content type for body to application/json.
For a quick intro read API-Integration-In-Python
Solution 4 - Python
I have a similar case but totally different solution, I've copied a snippet of code which looks like that:
resp_status, resp_data = requests.post(url, headers=headers, json=payload, verify=False)
and this resulted in error:
ValueError: too many values to unpack (expected 2)
just assigning to one variable resolve the issue:
response = requests.post(url, headers=headers, json=payload, verify=False)