'Write a physical package (.pptx file) to *pkg_file* containing
*pkg_rels* and *parts* and a content types stream based on the
content types of the parts.'

@staticmethod
def write(pkg_file, pkg_rels, parts):

    phys_writer = PhysPkgWriter(pkg_file)
    PackageWriter._write_content_types_stream(phys_writer, parts)
    PackageWriter._write_pkg_rels(phys_writer, pkg_rels)
    PackageWriter._write_parts(phys_writer, parts)
    phys_writer.close()
