我有一个mayavi图，我想将其嵌入到pyqt5制成的gui中。奇怪的是，有时它可以正常工作，而我得到的图形用户界面包括剧情，有时却不行。然后我得到这个错误：
runfile('C:/Users/xxx/Desktop/gui_mayavi.py', wdir='C:/Users/xxx/Desktop')
Traceback (most recent call last):
File "<ipython-input-5-9addd1570dd6>", line 1, in <module>
runfile('C:/Users/xxx/Desktop/gui_mayavi.py', wdir='C:/Users/xxx/Desktop')
File "C:\Users\xxx\Anaconda3\lib\site-packages\spyder\utils\site\sitecustomize.py", line 705, in runfile
execfile(filename, namespace)
File "C:\Users\xxx\Anaconda3\lib\site-packages\spyder\utils\site\sitecustomize.py", line 102, in execfile
exec(compile(f.read(), filename, 'exec'), namespace)
File "C:/Users/xxx/Desktop/gui_mayavi.py", line 23, in <module>
from traitsui.api import View, Item
File "C:\Users\xxx\Anaconda3\lib\site-packages\traitsui\api.py", line 36, in <module>
from .editors.api import ArrayEditor
File "C:\Users\xxx\Anaconda3\lib\site-packages\traitsui\editors\__init__.py", line 23, in <module>
from .api import ArrayEditor
File "C:\Users\xxx\Anaconda3\lib\site-packages\traitsui\editors\api.py", line 24, in <module>
from .code_editor import CodeEditor
File "C:\Users\xxx\Anaconda3\lib\site-packages\traitsui\editors\code_editor.py", line 37, in <module>
class ToolkitEditorFactory(EditorFactory):
File "C:\Users\xxx\Anaconda3\lib\site-packages\traitsui\editors\code_editor.py", line 49, in ToolkitEditorFactory
mark_color = Color(0xECE9D8)
File "C:\Users\xxx\Anaconda3\lib\site-packages\traits\traits.py", line 522, in __call__
return self.maker_function( *args, **metadata )
File "C:\Users\xxx\Anaconda3\lib\site-packages\traits\traits.py", line 1236, in Color
return ColorTrait( *args, **metadata )
File "C:\Users\xxx\Anaconda3\lib\site-packages\traitsui\toolkit_traits.py", line 8, in ColorTrait
return toolkit().color_trait(*args, **traits)
File "C:\Users\xxx\Anaconda3\lib\site-packages\traitsui\toolkit.py", line 109, in toolkit
_toolkit = find_toolkit('traitsui.toolkits')
File "C:\Users\xxx\Anaconda3\lib\site-packages\pyface\base_toolkit.py", line 263, in find_toolkit
return import_toolkit(ETSConfig.toolkit, entry_point)
File "C:\Users\xxx\Anaconda3\lib\site-packages\pyface\base_toolkit.py", line 209, in import_toolkit
raise RuntimeError(msg)
RuntimeError: No traitsui.toolkits plugin found for toolkit qt5
当它起作用时，我关闭Spyder（Python 3.6），然后再次打开它并尝试运行代码，它突然不再起作用了。我试图将pyqt5降级为pyqt4，但这没有帮助。再次重新安装pyqt5后，它突然工作了。但是，当我关闭spyder并再次打开时，它不再起作用。我正在尝试的代码是这样的：
# First, and before importing any Enthought packages, set the ETS_TOOLKIT
# environment variable to qt4, to tell Traits that we will use Qt.
import os
os.environ['ETS_TOOLKIT'] = 'qt5'
# By default, the PySide binding will be used. If you want the PyQt bindings
# to be used, you need to set the QT_API environment variable to 'pyqt'
#os.environ['QT_API'] = 'pyqt'
# To be able to use PySide or PyQt4 and not run in conflicts with traits,
# we need to import QtGui and QtCore from pyface.qt
from pyface.qt import QtGui, QtCore
# Alternatively, you can bypass this line, but you need to make sure that
# the following lines are executed before the import of PyQT:
# import sip
# sip.setapi('QString', 2)
from traits.api import HasTraits, Instance, on_trait_change
from traitsui.api import View, Item
from mayavi.core.ui.api import MayaviScene, MlabSceneModel, \
SceneEditor
################################################################################
#The actual visualization
class Visualization(HasTraits):
scene = Instance(MlabSceneModel, ())
@on_trait_change('scene.activated')
def update_plot(self):
# This function is called when the view is opened. We don't
# populate the scene when the view is not yet open, as some
# VTK features require a GLContext.
# We can do normal mlab calls on the embedded scene.
self.scene.mlab.test_points3d()
# the layout of the dialog screated
view = View(Item('scene', editor=SceneEditor(scene_class=MayaviScene),
height=250, width=300, show_label=False),
resizable=True # We need this to resize with the parent widget
)
################################################################################
# The QWidget containing the visualization, this is pure PyQt4 code.
class MayaviQWidget(QtGui.QWidget):
def __init__(self, parent=None):
QtGui.QWidget.__init__(self, parent)
layout = QtGui.QVBoxLayout(self)
layout.setContentsMargins(0,0,0,0)
layout.setSpacing(0)
self.visualization = Visualization()
# If you want to debug, beware that you need to remove the Qt
# input hook.
#QtCore.pyqtRemoveInputHook()
#import pdb ; pdb.set_trace()
#QtCore.pyqtRestoreInputHook()
# The edit_traits call will generate the widget to embed.
self.ui = self.visualization.edit_traits(parent=self,
kind='subpanel').control
layout.addWidget(self.ui)
self.ui.setParent(self)
if __name__ == "__main__":
# Don't create a new QApplication, it would unhook the Events
# set by Traits on the existing QApplication. Simply use the
# '.instance()' method to retrieve the existing one.
app = QtGui.QApplication.instance()
container = QtGui.QWidget()
container.setWindowTitle("Embedding Mayavi in a PyQt4 Application")
# define a "complex" layout to test the behaviour
layout = QtGui.QGridLayout(container)
# put some stuff around mayavi
label_list = []
for i in range(3):
for j in range(3):
if (i==1) and (j==1):continue
label = QtGui.QLabel(container)
label.setText("Your QWidget at (%d, %d)" % (i,j))
label.setAlignment(QtCore.Qt.AlignHCenter|QtCore.Qt.AlignVCenter)
layout.addWidget(label, i, j)
label_list.append(label)
mayavi_widget = MayaviQWidget(container)
layout.addWidget(mayavi_widget, 1, 1)
container.show()
window = QtGui.QMainWindow()
window.setCentralWidget(container)
window.show()
# Start the main event loop.
app.exec_()