PETSc installation with real and complex support

In root dir (here /opt/petsc)

For real support:

sudo python3 ./configure PETSC_ARCH=arch-real --with-scalar-type=real
sudo make PETSC_DIR=/opt/petsc PETSC_ARCH=arch-real all

For complex support:`

sudo python3 ./configure PETSC_ARCH=arch-complex --with-scalar-type=complex
sudo make PETSC_DIR=/opt/petsc PETSC_ARCH=arch-complex all

In conda env

export PETSC_DIR=/opt/petsc <!-- or wherever your source dir is-->
export PETSC_ARCH=arch-real:arch-complex
pip install petsc4py

Select type in Python PETSc

petsc4py.init(arch='arch-complex') #<!-- or arch-real -->