Function load_qt

pydev_ipython/qt_loaders.py:303–381

Attempt to import Qt, given a preference list of permissible bindings It is safe to call this function multiple times. Parameters ---------- api_options: List of strings The order of APIs to try. Valid items are 'pyside', 'pyqt', and 'pyqtv1' Returns

(api_options)

def load_qt(api_options):
    """
    Attempt to import Qt, given a preference list
    of permissible bindings

    It is safe to call this function multiple times.

    Parameters
    ----------
    api_options: List of strings
        The order of APIs to try. Valid items are 'pyside',
        'pyqt', and 'pyqtv1'

    Returns
    -------

    A tuple of QtCore, QtGui, QtSvg, QT_API
    The first three are the Qt modules. The last is the
    string indicating which module was loaded.

    Raises
    ------
    ImportError, if it isn't possible to import any requested
    bindings (either becaues they aren't installed, or because
    an incompatible library has already been installed)
    """
    loaders = {
        QT_API_PYSIDE: import_pyside,
        QT_API_PYSIDE2: import_pyside2,
        QT_API_PYSIDE6: import_pyside6,
        QT_API_PYQT: import_pyqt4,
        QT_API_PYQTv1: partial(import_pyqt4, version=1),
        QT_API_PYQT_DEFAULT: partial(import_pyqt4, version=None),
        QT_API_PYQT5: import_pyqt5,
        QT_API_PYQT6: import_pyqt6,
    }

    for api in api_options:
        if api not in loaders:
            raise RuntimeError(
                "Invalid Qt API %r, valid values are: %r, %r, %r, %r, %r, %r, %r"
                % (api, QT_API_PYSIDE, QT_API_PYSIDE2, QT_API_PYQT, QT_API_PYQTv1, QT_API_PYQT_DEFAULT, QT_API_PYQT5, QT_API_PYQT6)
            )

        if not can_import(api):
            continue

        # cannot safely recover from an ImportError during this
        result = loaders[api]()
        api = result[-1]  # changed if api = QT_API_PYQT_DEFAULT
        commit_api(api)
        return result
    else:
        raise ImportError(
            """
    Could not load requested Qt binding. Please ensure that
    PyQt4 >= 4.7 or PySide >= 1.0.3 is available,
    and only one is imported per session.