How to get a list of key names in Python/Google app engine?

For the first approach, ISBN as key: class Book(db. Model): #isbn is key, so it shouldn't be a property category = db.StringProperty() author = db.StringProperty() title = db.StringProperty() new_book = Book(category="fantasy,comedy", title="The Light Fantastic", author="TerryPratchett", key_name=isbn_number) Then getting list of all ISBNs: isbns = b.name() for Book. All(keys_only=True).

Creating a Book be = Book(key_name='isbn:0134815100494', **props) b.put() Querying keys = Book. All(keys_only=True). Fetch(100) key_names = key.name() for key in keys Look for keys_only and key_name when searching.

You don't need a list of key names for your use case. If you want to see if a book is already in the database, simply do Book. Get_by_key_name(someISBN).

There's also get_or_insert for writes, which will check if the entity you're adding is already in the database, writing it if it's not and returning it if it is.

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