Function has_binding

IPython/external/qt_loaders.py:120–157

Safely check for PyQt4/5, PySide or PySide2, without importing submodules Parameters ---------- api : str [ 'pyqtv1' | 'pyqt' | 'pyqt5' | 'pyside' | 'pyside2' | 'pyqtdefault'] Which module to check for Returns ------- True if the relevant module appears to be import

(api)

def has_binding(api):
    """Safely check for PyQt4/5, PySide or PySide2, without importing submodules

    Parameters
    ----------
    api : str [ 'pyqtv1' | 'pyqt' | 'pyqt5' | 'pyside' | 'pyside2' | 'pyqtdefault']
        Which module to check for

    Returns
    -------
    True if the relevant module appears to be importable
    """
    module_name = api_to_module[api]
    from importlib.util import find_spec

    required = ['QtCore', 'QtGui', 'QtSvg']
    if api in (QT_API_PYQT5, QT_API_PYSIDE2, QT_API_PYQT6, QT_API_PYSIDE6):
        # QT5 requires QtWidgets too
        required.append('QtWidgets')

    for submod in required:
        try:
            spec = find_spec('%s.%s' % (module_name, submod))
        except ImportError:
            # Package (e.g. PyQt5) not found
            return False
        else:
            if spec is None:
                # Submodule (e.g. PyQt5.QtCore) not found
                return False

    if api == QT_API_PYSIDE:
        # We can also safely check PySide version
        import PySide

        return PySide.__version_info__ >= (1, 0, 3)

    return True


def qtapi_version():