PennyLane (Bergholm 2018) is created by Xanadu and presents itself as the connecting puzzle piece between powerful established python libraries for machine learning, and quantum computing platforms. It provides readily implemented quantum algorithms for quantum machine learning, quantum chemistry and optimization. A particular algorithm provided in PennyLane is automatic differentiation of quantum circuits which allows to perform shot-efficient application of classical-quantum algorithms such as the Variational Quantum Eigensolver (VQE).