/usr/lib/petscdir/3.7.7/x86_64-linux-gnu-complex/bin/ is in libpetsc-complex-3.7.7-dev 3.7.7+dfsg1-2build5.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/petscdir/3.7.7/x86_64-linux-gnu-complex/bin/FASTMathInstaller.py
/usr/lib/petscdir/3.7.7/x86_64-linux-gnu-complex/bin/PetscBinaryIO.py
/usr/lib/petscdir/3.7.7/x86_64-linux-gnu-complex/bin/PetscBinaryIO_tests.py
/usr/lib/petscdir/3.7.7/x86_64-linux-gnu-complex/bin/TOPSGenerator.py
/usr/lib/petscdir/3.7.7/x86_64-linux-gnu-complex/bin/adiforfix.py
/usr/lib/petscdir/3.7.7/x86_64-linux-gnu-complex/bin/configVars.py
/usr/lib/petscdir/3.7.7/x86_64-linux-gnu-complex/bin/parseargs.py
/usr/lib/petscdir/3.7.7/x86_64-linux-gnu-complex/bin/petsc-mpiexec.uni
/usr/lib/petscdir/3.7.7/x86_64-linux-gnu-complex/bin/petsc_conf.py
/usr/lib/petscdir/3.7.7/x86_64-linux-gnu-complex/bin/petsc_gen_xdmf.py
/usr/lib/petscdir/3.7.7/x86_64-linux-gnu-complex/bin/petscdiff
/usr/lib/petscdir/3.7.7/x86_64-linux-gnu-complex/bin/petsclogformat.py
/usr/lib/petscdir/3.7.7/x86_64-linux-gnu-complex/bin/petscmpiexec
/usr/lib/petscdir/3.7.7/x86_64-linux-gnu-complex/bin/petscnagupgrade.py
/usr/lib/petscdir/3.7.7/x86_64-linux-gnu-complex/bin/popup
/usr/lib/petscdir/3.7.7/x86_64-linux-gnu-complex/bin/portabilitycheck.py
/usr/lib/petscdir/3.7.7/x86_64-linux-gnu-complex/bin/saws/
/usr/lib/petscdir/3.7.7/x86_64-linux-gnu-complex/bin/saws/SAWs.py
/usr/lib/petscdir/3.7.7/x86_64-linux-gnu-complex/bin/saws/getSAWs.bash
/usr/lib/petscdir/3.7.7/x86_64-linux-gnu-complex/bin/saws/getStack.bash
/usr/lib/petscdir/3.7.7/x86_64-linux-gnu-complex/bin/sendToJenkins
/usr/lib/petscdir/3.7.7/x86_64-linux-gnu-complex/bin/taucc.py
/usr/lib/petscdir/3.7.7/x86_64-linux-gnu-complex/bin/uncrustify.cfg
/usr/lib/petscdir/3.7.7/x86_64-linux-gnu-complex/bin/update.py
/usr/lib/petscdir/3.7.7/x86_64-linux-gnu-complex/bin/urlget
/usr/lib/petscdir/3.7.7/x86_64-linux-gnu-complex/bin/urlget.py