This statement 'I wish to import a .stp geometry file into pyfluent' is in itself not appropriate. It is important to note that PyFluent, or PyAnsys, is not a standalone tool but rather a Python interface for interacting with Ansys products. It primarily facilitates communication with Ansys products in a Pythonic manner. However, for meshing, solving and post-processing, you have the APIs to interface with the Ansys Fluent session. But as a starting point, you would typically need to prepare the CAD separately and have it ready to be imported in Fluent meshing, via PyFluent interfacing.