Keras is a popular Python Deep Learning library. It focuses on usability and fast experimentation, but is also powerful enough to support a wide variety of use cases.
If you're looking to get started with Keras, my Keras Neural Network tutorial is a good place to begin.
Keras is an easy-to-use abstraction built on top of tensorflow. Let's use Keras to build our first "hello world" of Machine Learning - The Digit ClassifierRead