Import the items in import_directives and return a list of the imported items

    Each item in import_directives should be one of the following forms
        * a tuple like ('module.submodule', ('classname1', 'classname2')), which indicates a 'from module.submodule import classname1, classname2'
        * a tuple like ('module.submodule', 'classname1'), which indicates a 'from module.submodule import classname1'
        * a tuple like ('module.submodule', '*'), which indicates a 'from module.submodule import *'
        * a simple 'module.submodule' which indicates 'import module.submodule'.

    Returns a dict mapping the names to the imported items

def import_items(import_directives, style, quiet_load=False):
    """
    Import the items in import_directives and return a list of the imported items

    Each item in import_directives should be one of the following forms
        * a tuple like ('module.submodule', ('classname1', 'classname2')), which indicates a 'from module.submodule import classname1, classname2'
        * a tuple like ('module.submodule', 'classname1'), which indicates a 'from module.submodule import classname1'
        * a tuple like ('module.submodule', '*'), which indicates a 'from module.submodule import *'
        * a simple 'module.submodule' which indicates 'import module.submodule'.

    Returns a dict mapping the names to the imported items
    """
    imported_objects = {}
    for directive in import_directives:
        try:
            # First try a straight import
            if isinstance(directive, six.string_types):
                imported_object = __import__(directive)
                imported_objects[directive.split('.')[0]] = imported_object
                if not quiet_load:
                    print(style.SQL_COLTYPE("import %s" % directive))
                continue
            elif isinstance(directive, (list, tuple)) and len(directive) == 2:
                if not isinstance(directive[0], six.string_types):
                    if not quiet_load:
                        print(style.ERROR("Unable to import %r: module name must be of type string" % directive[0]))
                    continue
                if isinstance(directive[1], (list, tuple)) and all(isinstance(e, six.string_types) for e in directive[1]):
                    # Try the ('module.submodule', ('classname1', 'classname2')) form
                    imported_object = __import__(directive[0], {}, {}, directive[1])
                    imported_names = []
                    for name in directive[1]:
                        try:
                            imported_objects[name] = getattr(imported_object, name)
                        except AttributeError:
                            if not quiet_load:
                                print(style.ERROR("Unable to import %r from %r: %r does not exist" % (name, directive[0], name)))
                        else:
                            imported_names.append(name)
                    if not quiet_load:
                        print(style.SQL_COLTYPE("from %s import %s" % (directive[0], ', '.join(imported_names))))
                elif isinstance(directive[1], six.string_types):
                    # If it is a tuple, but the second item isn't a list, so we have something like ('module.submodule', 'classname1')
                    # Check for the special '*' to import all
                    if directive[1] == '*':
                        imported_object = __import__(directive[0], {}, {}, directive[1])
                        for k in dir(imported_object):
                            imported_objects[k] = getattr(imported_object, k)
                        if not quiet_load:
                            print(style.SQL_COLTYPE("from %s import *" % directive[0]))
                    else:
                        imported_object = getattr(__import__(directive[0], {}, {}, [directive[1]]), directive[1])
                        imported_objects[directive[1]] = imported_object
                        if not quiet_load:
                            print(style.SQL_COLTYPE("from %s import %s" % (directive[0], directive[1])))
                else:
                    if not quiet_load:
                        print(style.ERROR("Unable to import %r from %r: names must be of type string" % (directive[1], directive[0])))
            else:
                if not quiet_load:
                    print(style.ERROR("Unable to import %r: names must be of type string" % directive))
        except ImportError:
            try:
                if not quiet_load:
                    print(style.ERROR("Unable to import %r" % directive))
            except TypeError:
                if not quiet_load:
                    print(style.ERROR("Unable to import %r from %r" % directive))

    return imported_objects