start_workspaces() only accepts keyword arguments

Question

I am trying to write a Python code in Lambda function which will start the stopped workspaces when the alarm triggers. The response type is dict.

But I am getting the error. Below is my code and error.

import json
import boto3

client = boto3.client('workspaces')
    
def lambda_handler(event, context):
    response = client.describe_workspaces(
        DirectoryId='d-966714f114'
    )
        
    #print(response)
    
    print("hello")

    for i in response['Workspaces']:
        if(i['State']== 'STOPPED'):
            print(i['WorkspaceId'])
            client.start_workspaces(i['WorkspaceId'])

{
    "errorMessage": "start_workspaces() only accepts keyword arguments.",
    "errorType": "TypeError",
    "stackTrace": [
    "  File \"/var/task/lambda_function.py\", line 21, in lambda_handler\n    client.start_workspaces(i)\n",
    "  File \"/var/runtime/botocore/client.py\", line 354, in _api_call\n    raise TypeError(\n"
    ]
}

Answer 1

If you look at the call's documentation, it says that it expects keyword StartWorkspaceRequests, which is in itself a list of dicts:

{
    'WorkspaceId': 'string'
},

The call doesn't accept arguments (just a value being passed without corresponding keyword). You need to adapt your call to conform to the format expected by boto3.

import json
import boto3

client = boto3.client('workspaces')
    
def lambda_handler(event, context):
    response = client.describe_workspaces(
        DirectoryId='d-966714f114'
    )
        
    workspaces_to_start = []
         
    for i in response['Workspaces']:
        if(i['State']== 'STOPPED'):
            workspaces_to_start.append({'WorkspaceId': i['WorkspaceId']})

    if workspaces_to_start:
        client.start_workspaces(StartWorkspaceRequests=workspaces_to_start)