python json check if key exist

import json
  if 'id' not in dest:
      dest['id'] = -1
    targetId = dest['id']

Here is what the above code is Doing:
1. It’s creating a new dictionary called dest.
2. It’s adding a key called ‘id’ to dest, and setting the value of that key to -1.
3. It’s creating a variable called targetId, and setting it equal to the value of the ‘id’ key in dest.

Now, let’s say we want to add a new key to dest called ‘name’, and set the value of that key to ‘John’. We can do that like this: