Accessing Lambda Python event - ERROR

Question

In a Lambda Python function, I desire to get 3 data items from the lambda_handler event.  Previously & recently this syntax worked:
param = event.get('queryStringParameters')
myUsername = param['Username']

Now in a new function, it has a bad error.  I never get past the 1st item of data.  I have set the test event to:
{
  "Username" : "Priscilla",
}

The error is:
{
  "errorMessage": "'NoneType' object is not subscriptable",
  "errorType": "TypeError",
  "requestId": "fd866aa9-d83a-42f2-8d91-265f10814f43",
  "stackTrace": [
    "  File "/var/task/lambda_function.py", line 35, in lambda_handler
    myUsername = param['Username']
"
  ]
}

Any help would be appreciated.

Answer

Hello.

When you issue a test event, the Lambda function's "event" will contain the json passed in the test event.  
In other words, in this case, the json "{ "Username" : "Priscilla"}" is passed as is to the event, so "queryStringParameters" is None.  
The cause of the error is that "queryStringParameters" is not included in the test event json.  
So, I think it will work if you change the json used in the test event as follows.  
```
{
    "queryStringParameters": 
    { 
        "Username" : "Priscilla"
    }
}
```

Answer

Thank you - worked perfectly.  Appreciated!

Accessing Lambda Python event - ERROR

Relevant content