FWIW, unfortunately on mac with today’s nightly the pip install works and reports no errors, but when running the example script it crashes with the trace pasted below.
Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0 libpython3.6m.dylib 0x000000010624b134 PyUnicode_InternInPlace + 116
1 libpython3.6m.dylib 0x000000010626c3cc PyUnicode_InternFromString + 60
2 libpython3.6m.dylib 0x000000010621eaa0 PyObject_GetAttrString + 48
3 libpython3.6m.dylib 0x00000001061dd088 PyObject_CallMethod + 120
4 libCTKScriptingPythonWidgets.0.1.dylib 0x00000001016f0ed0 ctkPythonConsolePrivate::push(QString const&) + 144
5 libCTKScriptingPythonWidgets.0.1.dylib 0x00000001016f1f22 ctkPythonConsole::executeCommand(QString const&) + 18
6 libCTKWidgets.0.1.dylib 0x0000000101722243 ctkConsolePrivate::internalExecuteCommand() + 563
7 libCTKWidgets.0.1.dylib 0x0000000101721aa8 ctkConsolePrivate::keyPressEvent(QKeyEvent*) + 2120
8 org.qt-project.QtWidgets 0x0000000106d7ec90 QWidget::event(QEvent*) + 5104
9 org.qt-project.QtWidgets 0x0000000106e31c8d QFrame::event(QEvent*) + 45
10 org.qt-project.QtWidgets 0x0000000106e3b78c QAbstractScrollArea::event(QEvent*) + 364
11 org.qt-project.QtWidgets 0x0000000106f22127 QTextEdit::event(QEvent*) + 407
12 org.qt-project.QtWidgets 0x0000000106d458cd QApplicationPrivate::notify_helper(QObject*, QEvent*) + 301
13 org.qt-project.QtWidgets 0x0000000106d46ddd QApplication::notify(QObject*, QEvent*) + 797
14 libqSlicerBaseQTGUI.dylib 0x00000001010bf3d6 qSlicerApplication::notify(QObject*, QEvent*) + 22
15 org.qt-project.QtCore 0x000000010d9d9c84 QCoreApplication::notifyInternal2(QObject*, QEvent*) + 164
16 org.qt-project.QtWidgets 0x0000000106d9daf7 0x106d35000 + 428791
17 org.qt-project.QtWidgets 0x0000000106d458cd QApplicationPrivate::notify_helper(QObject*, QEvent*) + 301
18 org.qt-project.QtWidgets 0x0000000106d46c47 QApplication::notify(QObject*, QEvent*) + 391
19 libqSlicerBaseQTGUI.dylib 0x00000001010bf3d6 qSlicerApplication::notify(QObject*, QEvent*) + 22
20 org.qt-project.QtCore 0x000000010d9d9c84 QCoreApplication::notifyInternal2(QObject*, QEvent*) + 164
21 org.qt-project.QtGui 0x000000010d2fa2ee QGuiApplicationPrivate::processKeyEvent(QWindowSystemInterfacePrivate::KeyEvent*) + 174
22 org.qt-project.QtGui 0x000000010d2e095b QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) + 155
23 org.qt-project.QtGui 0x000000010d2dc3bc QWindowSystemInterface::flushWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) + 572
24 libqcocoa.dylib 0x0000000116f63aa3 0x116f41000 + 141987
25 libqcocoa.dylib 0x0000000116f63be8 0x116f41000 + 142312
26 com.apple.AppKit 0x00007fff4b533b9f -[NSWindow(NSEventRouting) _reallySendEvent:isDelayedEvent:] + 6840
27 com.apple.AppKit 0x00007fff4b531e9f -[NSWindow(NSEventRouting) sendEvent:] + 478
28 libqcocoa.dylib 0x0000000116f68217 0x116f41000 + 160279
29 com.apple.AppKit 0x00007fff4b3d2101 -[NSApplication(NSEvent) sendEvent:] + 2953
30 libqcocoa.dylib 0x0000000116f6e669 0x116f41000 + 185961
31 com.apple.AppKit 0x00007fff4b3bfee8 -[NSApplication run] + 755
32 libwx_osx_cocoau_core-3.0.0.4.0.dylib 0x000000012bf72edf wxApp::CallOnInit() + 143
33 _core.cpython-36m-darwin.so 0x000000012b417724 wxPyApp::_BootstrapApp() + 532
34 _core.cpython-36m-darwin.so 0x000000012b41b604 meth_wxPyApp__BootstrapApp(_object*, _object*) + 100
35 libpython3.6m.dylib 0x000000010621c00c _PyCFunction_FastCallDict + 172
36 libpython3.6m.dylib 0x000000010629ac0f call_function + 479
37 libpython3.6m.dylib 0x0000000106297632 _PyEval_EvalFrameDefault + 25826
38 libpython3.6m.dylib 0x000000010629bb19 _PyEval_EvalCodeWithName + 3641
39 libpython3.6m.dylib 0x000000010629c652 _PyFunction_FastCallDict + 802
40 libpython3.6m.dylib 0x00000001061dc8a8 _PyObject_FastCallDict + 360
41 libpython3.6m.dylib 0x00000001061dc9c5 _PyObject_Call_Prepend + 149
42 libpython3.6m.dylib 0x00000001061dc5f6 PyObject_Call + 102
43 libpython3.6m.dylib 0x0000000106233d7e slot_tp_init + 158
44 libpython3.6m.dylib 0x000000010622feb9 type_call + 313
45 libpython3.6m.dylib 0x00000001061dc875 _PyObject_FastCallDict + 309
46 libpython3.6m.dylib 0x000000010629ab09 call_function + 217
47 libpython3.6m.dylib 0x0000000106297632 _PyEval_EvalFrameDefault + 25826
48 libpython3.6m.dylib 0x000000010629bb19 _PyEval_EvalCodeWithName + 3641
49 libpython3.6m.dylib 0x000000010629c652 _PyFunction_FastCallDict + 802
50 libpython3.6m.dylib 0x00000001061dc8a8 _PyObject_FastCallDict + 360
51 libpython3.6m.dylib 0x00000001061dc9c5 _PyObject_Call_Prepend + 149
52 libpython3.6m.dylib 0x00000001061dc5f6 PyObject_Call + 102
53 libpython3.6m.dylib 0x0000000106297933 _PyEval_EvalFrameDefault + 26595
54 libpython3.6m.dylib 0x000000010629bb19 _PyEval_EvalCodeWithName + 3641
55 libpython3.6m.dylib 0x00000001062910fb PyEval_EvalCodeEx + 107
56 libpython3.6m.dylib 0x000000010620233d function_call + 381
57 libpython3.6m.dylib 0x00000001061dc5f6 PyObject_Call + 102
58 libpython3.6m.dylib 0x0000000106297933 _PyEval_EvalFrameDefault + 26595
59 libpython3.6m.dylib 0x000000010629bb19 _PyEval_EvalCodeWithName + 3641
60 libpython3.6m.dylib 0x000000010629c316 fast_function + 742
61 libpython3.6m.dylib 0x000000010629abe9 call_function + 441
62 libpython3.6m.dylib 0x0000000106297632 _PyEval_EvalFrameDefault + 25826
63 libpython3.6m.dylib 0x000000010629bb19 _PyEval_EvalCodeWithName + 3641
64 libpython3.6m.dylib 0x0000000106291084 PyEval_EvalCode + 100
65 libpython3.6m.dylib 0x000000010628e7e0 builtin_exec + 528
66 libpython3.6m.dylib 0x000000010621c00c _PyCFunction_FastCallDict + 172
67 libpython3.6m.dylib 0x000000010629ac0f call_function + 479
68 libpython3.6m.dylib 0x0000000106297632 _PyEval_EvalFrameDefault + 25826
69 libpython3.6m.dylib 0x000000010629c26e fast_function + 574
70 libpython3.6m.dylib 0x000000010629abe9 call_function + 441
71 libpython3.6m.dylib 0x0000000106297632 _PyEval_EvalFrameDefault + 25826
72 libpython3.6m.dylib 0x000000010629bb19 _PyEval_EvalCodeWithName + 3641
73 libpython3.6m.dylib 0x000000010629c316 fast_function + 742
74 libpython3.6m.dylib 0x000000010629abe9 call_function + 441
75 libpython3.6m.dylib 0x0000000106297632 _PyEval_EvalFrameDefault + 25826
76 libpython3.6m.dylib 0x000000010629c6ec _PyFunction_FastCallDict + 956
77 libpython3.6m.dylib 0x00000001061dc8a8 _PyObject_FastCallDict + 360
78 libpython3.6m.dylib 0x00000001061dc9c5 _PyObject_Call_Prepend + 149
79 libpython3.6m.dylib 0x00000001061dc875 _PyObject_FastCallDict + 309
80 libpython3.6m.dylib 0x00000001061dd1d4 callmethod + 180
81 libpython3.6m.dylib 0x00000001061dd0c4 PyObject_CallMethod + 180
82 libCTKScriptingPythonWidgets.0.1.dylib 0x00000001016f0ed0 ctkPythonConsolePrivate::push(QString const&) + 144
83 libCTKScriptingPythonWidgets.0.1.dylib 0x00000001016f1f22 ctkPythonConsole::executeCommand(QString const&) + 18
84 libCTKWidgets.0.1.dylib 0x0000000101722243 ctkConsolePrivate::internalExecuteCommand() + 563
85 libCTKWidgets.0.1.dylib 0x0000000101724afb ctkConsolePrivate::pasteText(QString const&) + 459
86 libCTKWidgets.0.1.dylib 0x0000000101724893 ctkConsolePrivate::insertFromMimeData(QMimeData const*) + 115
87 libCTKWidgets.0.1.dylib 0x00000001017213b9 ctkConsolePrivate::keyPressEvent(QKeyEvent*) + 345
88 org.qt-project.QtWidgets 0x0000000106d7ec90 QWidget::event(QEvent*) + 5104
89 org.qt-project.QtWidgets 0x0000000106e31c8d QFrame::event(QEvent*) + 45
90 org.qt-project.QtWidgets 0x0000000106e3b78c QAbstractScrollArea::event(QEvent*) + 364
91 org.qt-project.QtWidgets 0x0000000106f22127 QTextEdit::event(QEvent*) + 407
92 org.qt-project.QtWidgets 0x0000000106d458cd QApplicationPrivate::notify_helper(QObject*, QEvent*) + 301
93 org.qt-project.QtWidgets 0x0000000106d46ddd QApplication::notify(QObject*, QEvent*) + 797
94 libqSlicerBaseQTGUI.dylib 0x00000001010bf3d6 qSlicerApplication::notify(QObject*, QEvent*) + 22
95 org.qt-project.QtCore 0x000000010d9d9c84 QCoreApplication::notifyInternal2(QObject*, QEvent*) + 164
96 org.qt-project.QtWidgets 0x0000000106d9daf7 0x106d35000 + 428791
97 org.qt-project.QtWidgets 0x0000000106d458cd QApplicationPrivate::notify_helper(QObject*, QEvent*) + 301
98 org.qt-project.QtWidgets 0x0000000106d46c47 QApplication::notify(QObject*, QEvent*) + 391
99 libqSlicerBaseQTGUI.dylib 0x00000001010bf3d6 qSlicerApplication::notify(QObject*, QEvent*) + 22
100 org.qt-project.QtCore 0x000000010d9d9c84 QCoreApplication::notifyInternal2(QObject*, QEvent*) + 164
101 org.qt-project.QtGui 0x000000010d2fa2ee QGuiApplicationPrivate::processKeyEvent(QWindowSystemInterfacePrivate::KeyEvent*) + 174
102 org.qt-project.QtGui 0x000000010d2e095b QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) + 155
103 org.qt-project.QtGui 0x000000010d2dc3bc QWindowSystemInterface::flushWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) + 572
104 libqcocoa.dylib 0x0000000116f63aa3 0x116f41000 + 141987
105 libqcocoa.dylib 0x0000000116f63be8 0x116f41000 + 142312
106 com.apple.AppKit 0x00007fff4b533b9f -[NSWindow(NSEventRouting) _reallySendEvent:isDelayedEvent:] + 6840
107 com.apple.AppKit 0x00007fff4b531e9f -[NSWindow(NSEventRouting) sendEvent:] + 478
108 libqcocoa.dylib 0x0000000116f68217 0x116f41000 + 160279
109 libqcocoa.dylib 0x0000000116f6f1d0 0x116f41000 + 188880
110 com.apple.AppKit 0x00007fff4b713f99 -[NSMenu _performKeyEquivalentWithDelegate:] + 142
111 com.apple.AppKit 0x00007fff4b714169 -[NSMenu _performKeyEquivalentWithDelegate:] + 606
112 com.apple.AppKit 0x00007fff4b713b2b -[NSMenu performKeyEquivalent:] + 68
113 com.apple.AppKit 0x00007fff4bb99517 routeKeyEquivalent + 860
114 com.apple.AppKit 0x00007fff4b3d19a0 -[NSApplication(NSEvent) sendEvent:] + 1064
115 libqcocoa.dylib 0x0000000116f6e669 0x116f41000 + 185961
116 com.apple.AppKit 0x00007fff4b3bfee8 -[NSApplication run] + 755
117 libqcocoa.dylib 0x0000000116f6ae0d 0x116f41000 + 171533
118 org.qt-project.QtCore 0x000000010d9d5641 QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) + 417
119 org.qt-project.QtCore 0x000000010d9da358 QCoreApplication::exec() + 392
120 0x0000000100d42cec main + 540
121 libdyld.dylib 0x00007fff7a2613d5 start + 1