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The technique for getting a key in a document as a value in MongoDB Python is to use the dot notation. For example, if you have a document like this:
{'name': 'John', 'age': 30, 'city': 'New York'}
You can access the value of the "name" key by using dot notation like this:
document = {'name': 'John', 'age': 30, 'city': 'New York'}
name = document['name']
In this case, the value of "name" will be "John".