b is used.  The default is 4.
from_imports is optionally set to generate relative import statements.  At
the moment this only applies to the import of resource modules.
resource_suffix is the suffix appended to the basename of any resource file
specified in the .ui file to create the name of the Python module generated
from the resource file by pyrcc4.  The default is '_rc', i.e. if the .ui
file specified a resource file called foo.qrc then the corresponding Python
module is foo_rc.
import_from is optionally set to the package used for relative import
statements.  The default is ``'.'``.
r