Python Installation Instructions

Assuming you have already completed the base installation Instructions, the rest of the Python installation instructions is fairly simple:

1. change into the correct directory:

   $ cd path/to/qiskit-fermions
   

2. install the Python installation tooling

   $ pip install --group build
   

3. compile the pyext crate:

   $ make pyext
   

4. install the Python package:

   $ make pyinstall
   

5. ensure that the shared library object can be found during linking:

   Linux

   Copy and export the LD_LIBRARY_PATH from the output below.

   $ make echo_ld_lib_path
   

   MacOS

   Copy and export the DYLD_LIBRARY_PATH from the output below.

   $ make echo_ld_lib_path
   

6. ensure that you copy and run the output above

7. verify that everything worked by running the Python API tests:

   $ make testpython
   

From now on, you need to ensure that you always export the LD_LIBRARY_PATH as before when you want to use this Python package.