Updating Variables through Python API

alex_kagay · November 2023

Hi,

I have started a project where I would like to do a GET to get the variables of a part, do a mathematical operation, and then POST the updated variables. I have gotten the GET and the mathematical operation, and am struggling to actually POST. My document is linked here.

I have obtained the url from the Glassworks API Explorer, but I am not sure what to use for the Request body or how to pass that into the POST statement.

When I use just the Glassworks API explorer, I get an error 404, not found.

My code for posting is:

fixed_url = '/api/v6/variables/d/did/w/wid/e/eid/variables'

fixed_url = self.fix_url(fixed_url,self.element.did,self.element.wvmid,self.element.eid,999)

params = {}

headers = {'Accept': 'application/vnd.onshape.v1+json; charset=UTF-8;qs=0.1', 'Content-Type': 'application/json'}

vars = json.loads(response.content)

value1 = "1.5 meter"

vars[0]["variables"][0]["value"] = value1

payload = {"content":vars}

response = requests.post(self.base+fixed_url,

params=params,

auth=self.api_keys,

headers=headers,

payload=payload)

I would appreciate any insight to what I am doing wrong, thank you!

Matt_Shields · November 2023

I think using POST with the variables endpoint only works with Variable Studios.

To update variable features, I think you need to use the features endpoint.

https://cad.onshape.com/api/partstudios/d/{DID}/w/{WID}/e/{EID}/features/featureid/{FID}

philip_kristoffersen · November 2023

I have the exact same problem both when variables are in variables studio and not

Matt_Shields · November 2023

this worked for me:

import requests 

# Get all of the variables in the Part Studio
response = requests.get(
    "https://cad.onshape.com/api/variables/d/{}/{}/{}/e/{}/variables".format(
        DID, WVM, WID, EID
    ), 
    auth=(API_ACCESS, API_SECRET), 
    headers={
        "Accept": "application/json;charset=UTF-8; qs=0.09", 
        "Content-Type": "application/json"
    }
) 
response = response.json()
# Grab just the variables from the response
variables = response[0]["variables"]

# Update the angles, adding 5 degrees
for var in variables:
  if var['type'] == "ANGLE":
          arr = var['expression'].split(" ")
          arr[0] = int(arr[0]) + 5
          var['expression'] = str(arr[0]) + " deg"
          print("Angle updated to " + var['expression'])

payload = response[0]["variables"]

# Post the variables back
response = requests.post(
    "https://cad.onshape.com/api/variables/d/{}/w/{}/e/{}/variables".format(
        DID, WID, EID
    ), 
    auth=(API_ACCESS, API_SECRET), 
    headers={
        "Accept": "application/json;charset=UTF-8; qs=0.09", 
        "Content-Type": "application/json"
    },
    json=payload
) 
# Response 204 is success with no content
print<span>(response)</span><br><br>

Updating Variables through Python API

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