CODEWITHSUNDEEP
python-3.xamazon-web-servicesaws-lambda
Stephen Lester
Stephen Lester

Reputation: 358

AWS Lambda Python 3 check event variable exists

 try: 
        event['ids']
 except NameError: 
        ids = None

This is throwing a KeyError. I just want to check if the event variable exists and set to none or pass the value if it does. I have also tried to use 

if (len(event['ids']) < 1)

but get an error. Am I missing something? I may or may not have all my event keys passed and want to check for existence.

Upvotes: 4

Views: 9427

Answers (2)

DHEERAJ
DHEERAJ

Reputation: 611

We can check if the key 'key1' exists in the Json dictionary.

{ 
"key1":"value1"
}

To retrieve the value 'value1' if the key 'key1' exists in the dictionary.

if event.get('key1',None) != None:
   value = event.get('key1',None)

Upvotes: -2

mypetlion
mypetlion

Reputation: 2524

Use the get method. The second parameter is the default value if the key doesn't exist in the dictionary. It's the standard way to get values from a dictionary when you're not sure if the key exists and you don't want an exception.

ids = event.get('ids', None)

Upvotes: 26

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