common.py 文件源码

def assert_installed(win=None, modules=[], binaries=[]):
    missing = defaultdict(list)
    for items, what, func in ((modules, 'modules', find_spec),
                              (binaries, 'binaries', which)):
        for item in items:
            if not func(item):
                missing[what].append(item)
    if missing:
        msg = []
        for subject, names in missing.items():
            if len(names) == 1:
                subject = {'modules': 'module', 'binaries': 'binary'}[subject]
            msg.append('%s "%s"' % (subject, '", "'.join(names)))
        msg = 'You are missing the %s for this.' % ' and '.join(msg)
        if win:
            from PyQt5.QtWidgets import QMessageBox
            QMessageBox.warning(win, ' ', msg)
        else:
            raise ImportError(msg)
    return not missing