Hi the @interact command no longer seems to be working in Sage 7.3 and Sage
7.4 on an Mac Book Pro running El Capitan:
Here is the contents I entered in an "Jupyter" notebook cell which I copied
from a Sage interact example:
-----------------------------------------------------------------------------------
Contents of the sage 7.4 notebook cell:
from ipywidgets import interact, interactive, fixed
import ipywidgets as widgets
@interact(num=5)
def square(num=2):
print "{} squared is {}".format(num, num*num)
--------------------------------------------------------------------------------------------
Here is the error output: displayed in the output cell:
------------------------------------------------------------------------------------------------------
Traceback (most recent call last): print "{} squared is {}".format(num,
num*num) File "", line 1, in <module> File
"/private/var/folders/31/r_2f8ryd5ks7xb80nyrbj2cc0000gn/T/tmprIbuu6/___c
\ ode___.py", line 8, in <module> def square(num=_sage_const_2 ): File
"/Applications/SageMath-7.4.app/Contents/Resources/sage/local/lib/python
\ 2.7/site-packages/ipywidgets/widgets/interaction.py", line 360, in dec
return interact(f, **kwargs) File
"/Applications/SageMath-7.4.app/Contents/Resources/sage/local/lib/python
\ 2.7/site-packages/ipywidgets/widgets/interaction.py", line 343, in
interact w = interactive(f, **kwargs) File
"/Applications/SageMath-7.4.app/Contents/Resources/sage/local/lib/python
\ 2.7/site-packages/ipywidgets/widgets/interaction.py", line 203, in
interactive container = Box(_dom_classes=['widget-interact']) File
"/Applications/SageMath-7.4.app/Contents/Resources/sage/local/lib/python
\ 2.7/site-packages/ipywidgets/widgets/widget_box.py", line 44, in
__init__ super(Box, self).__init__(**kwargs) File
"/Applications/SageMath-7.4.app/Contents/Resources/sage/local/lib/python
\ 2.7/site-packages/ipywidgets/widgets/domwidget.py", line 90, in
__init__ super(DOMWidget, self).__init__(*pargs, **kwargs) File
"/Applications/SageMath-7.4.app/Contents/Resources/sage/local/lib/python
\ 2.7/site-packages/ipywidgets/widgets/widget.py", line 184, in __init__
self.open() File
"/Applications/SageMath-7.4.app/Contents/Resources/sage/local/lib/python
\ 2.7/site-packages/ipywidgets/widgets/widget.py", line 197, in open
state, buffer_keys, buffers =
self._split_state_buffers(self.get_state()) File
"/Applications/SageMath-7.4.app/Contents/Resources/sage/local/lib/python
\ 2.7/site-packages/ipywidgets/widgets/widget.py", line 291, in
get_state value = to_json(getattr(self, k), self) File
"/Applications/SageMath-7.4.app/Contents/Resources/sage/local/lib/python
\ 2.7/site-packages/traitlets/traitlets.py", line 529, in __get__ return
self.get(obj, cls) File
"/Applications/SageMath-7.4.app/Contents/Resources/sage/local/lib/python
\ 2.7/site-packages/traitlets/traitlets.py", line 508, in get value =
self._validate(obj, dynamic_default()) File
"/Applications/SageMath-7.4.app/Contents/Resources/sage/local/lib/python
\ 2.7/site-packages/ipywidgets/widgets/domwidget.py", line 23, in
_layout_default return Layout() File
"/Applications/SageMath-7.4.app/Contents/Resources/sage/local/lib/python
\ 2.7/site-packages/ipywidgets/widgets/widget.py", line 184, in __init__
self.open() File
"/Applications/SageMath-7.4.app/Contents/Resources/sage/local/lib/python
\ 2.7/site-packages/ipywidgets/widgets/widget.py", line 203, in open
self.comm = Comm(**args) File
"/Applications/SageMath-7.4.app/Contents/Resources/sage/local/lib/python
\ 2.7/site-packages/ipykernel/comm/comm.py", line 63, in __init__
self.open(data=data, metadata=metadata, buffers=buffers) File
"/Applications/SageMath-7.4.app/Contents/Resources/sage/local/lib/python
\ 2.7/site-packages/ipykernel/comm/comm.py", line 94, in open
comm_manager = getattr(self.kernel, 'comm_manager', None) File
"/Applications/SageMath-7.4.app/Contents/Resources/sage/local/lib/python
\ 2.7/site-packages/traitlets/traitlets.py", line 529, in __get__ return
self.get(obj, cls) File
"/Applications/SageMath-7.4.app/Contents/Resources/sage/local/lib/python
\ 2.7/site-packages/traitlets/traitlets.py", line 508, in get value =
self._validate(obj, dynamic_default()) File
"/Applications/SageMath-7.4.app/Contents/Resources/sage/local/lib/python
\ 2.7/site-packages/traitlets/traitlets.py", line 564, in _validate
value = self.validate(obj, value) File
"/Applications/SageMath-7.4.app/Contents/Resources/sage/local/lib/python
\ 2.7/site-packages/traitlets/traitlets.py", line 1589, in validate
self.error(obj, value) File
"/Applications/SageMath-7.4.app/Contents/Resources/sage/local/lib/python
\ 2.7/site-packages/traitlets/traitlets.py", line 1436, in error raise
TraitError(e) traitlets.traitlets.TraitError: The 'kernel' trait of a
Comm instance must be a Kernel, but a value of type 'NoneType' (i.e.
None) was specified.
----------------------------------------------------------------------------------------------------------------
Any ideas?
Regards,
Adam Hausknecht
Department of Mathematics
UMass Dartmouth
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Contents of the sage 7.4 notebook cell:
from ipywidgets import interact, interactive, fixed
import ipywidgets as widgets
@interact(num=5)
def square(num=2):
print "{} squared is {}".format(num, num*num)
Error message displayed in the output cell:
Traceback (most recent call last): print "{} squared is {}".format(num,
num*num) File "", line 1, in <module> File
"/private/var/folders/31/r_2f8ryd5ks7xb80nyrbj2cc0000gn/T/tmprIbuu6/___c
\ ode___.py", line 8, in <module> def square(num=_sage_const_2 ): File
"/Applications/SageMath-7.4.app/Contents/Resources/sage/local/lib/python
\ 2.7/site-packages/ipywidgets/widgets/interaction.py", line 360, in dec
return interact(f, **kwargs) File
"/Applications/SageMath-7.4.app/Contents/Resources/sage/local/lib/python
\ 2.7/site-packages/ipywidgets/widgets/interaction.py", line 343, in
interact w = interactive(f, **kwargs) File
"/Applications/SageMath-7.4.app/Contents/Resources/sage/local/lib/python
\ 2.7/site-packages/ipywidgets/widgets/interaction.py", line 203, in
interactive container = Box(_dom_classes=['widget-interact']) File
"/Applications/SageMath-7.4.app/Contents/Resources/sage/local/lib/python
\ 2.7/site-packages/ipywidgets/widgets/widget_box.py", line 44, in
__init__ super(Box, self).__init__(**kwargs) File
"/Applications/SageMath-7.4.app/Contents/Resources/sage/local/lib/python
\ 2.7/site-packages/ipywidgets/widgets/domwidget.py", line 90, in
__init__ super(DOMWidget, self).__init__(*pargs, **kwargs) File
"/Applications/SageMath-7.4.app/Contents/Resources/sage/local/lib/python
\ 2.7/site-packages/ipywidgets/widgets/widget.py", line 184, in __init__
self.open() File
"/Applications/SageMath-7.4.app/Contents/Resources/sage/local/lib/python
\ 2.7/site-packages/ipywidgets/widgets/widget.py", line 197, in open
state, buffer_keys, buffers =
self._split_state_buffers(self.get_state()) File
"/Applications/SageMath-7.4.app/Contents/Resources/sage/local/lib/python
\ 2.7/site-packages/ipywidgets/widgets/widget.py", line 291, in
get_state value = to_json(getattr(self, k), self) File
"/Applications/SageMath-7.4.app/Contents/Resources/sage/local/lib/python
\ 2.7/site-packages/traitlets/traitlets.py", line 529, in __get__ return
self.get(obj, cls) File
"/Applications/SageMath-7.4.app/Contents/Resources/sage/local/lib/python
\ 2.7/site-packages/traitlets/traitlets.py", line 508, in get value =
self._validate(obj, dynamic_default()) File
"/Applications/SageMath-7.4.app/Contents/Resources/sage/local/lib/python
\ 2.7/site-packages/ipywidgets/widgets/domwidget.py", line 23, in
_layout_default return Layout() File
"/Applications/SageMath-7.4.app/Contents/Resources/sage/local/lib/python
\ 2.7/site-packages/ipywidgets/widgets/widget.py", line 184, in __init__
self.open() File
"/Applications/SageMath-7.4.app/Contents/Resources/sage/local/lib/python
\ 2.7/site-packages/ipywidgets/widgets/widget.py", line 203, in open
self.comm = Comm(**args) File
"/Applications/SageMath-7.4.app/Contents/Resources/sage/local/lib/python
\ 2.7/site-packages/ipykernel/comm/comm.py", line 63, in __init__
self.open(data=data, metadata=metadata, buffers=buffers) File
"/Applications/SageMath-7.4.app/Contents/Resources/sage/local/lib/python
\ 2.7/site-packages/ipykernel/comm/comm.py", line 94, in open
comm_manager = getattr(self.kernel, 'comm_manager', None) File
"/Applications/SageMath-7.4.app/Contents/Resources/sage/local/lib/python
\ 2.7/site-packages/traitlets/traitlets.py", line 529, in __get__ return
self.get(obj, cls) File
"/Applications/SageMath-7.4.app/Contents/Resources/sage/local/lib/python
\ 2.7/site-packages/traitlets/traitlets.py", line 508, in get value =
self._validate(obj, dynamic_default()) File
"/Applications/SageMath-7.4.app/Contents/Resources/sage/local/lib/python
\ 2.7/site-packages/traitlets/traitlets.py", line 564, in _validate
value = self.validate(obj, value) File
"/Applications/SageMath-7.4.app/Contents/Resources/sage/local/lib/python
\ 2.7/site-packages/traitlets/traitlets.py", line 1589, in validate
self.error(obj, value) File
"/Applications/SageMath-7.4.app/Contents/Resources/sage/local/lib/python
\ 2.7/site-packages/traitlets/traitlets.py", line 1436, in error raise
TraitError(e) traitlets.traitlets.TraitError: The 'kernel' trait of a
Comm instance must be a Kernel, but a value of type 'NoneType' (i.e.
None) was specified.
