ipywidgets is not supporting in python terminal - python-3.x

Question

I am trying to run below code using python terminal, it works completely fine when i run in jupyter notebook, but in ubuntu terminal it throws error. even tried running jupyter nbextension enable --py --sys-prefix widgetsnbextension on the terminal still I receive same error
import matplotlib as mp
from pylab import *
from sklearn import datasets
from ipywidgets import interact, widgets
from IPython.display import display, clear_output
faces = datasets.fetch_olivetti_faces()
class Trainer:
def __init__(self):
self.results = {}
self.imgs = faces.images
self.index = 0
def increment_face(self):
if self.index + 1 >= len(self.imgs):
return self.index
else:
while str(self.index) in self.results:
print(self.index)
self.index += 1
return self.index
def record_result(self, smile=True):
self.results[str(self.index)] = smile
trainer = Trainer()
button_smile = widgets.Button(description='smile')
button_no_smile = widgets.Button(description='sad face')
def display_face(face):
clear_output()
imshow(face, cmap='gray')
axis('off')
show()
def update_smile(b):
trainer.record_result(smile=True)
trainer.increment_face()
display_face(trainer.imgs[trainer.index])
def update_no_smile(b):
trainer.record_result(smile=False)
trainer.increment_face()
display_face(trainer.imgs[trainer.index])
button_no_smile.on_click(update_no_smile)
button_smile.on_click(update_smile)
display(button_smile)
display(button_no_smile)
display_face(trainer.imgs[trainer.index])
Traceback error when I was running from python terminal
Widget Javascript not detected. It may not be installed properly. Did you enable the widgetsnbextension? If not, then run "jupyter nbextension enable --py --sys-prefix widgetsnbextension"
---------------------------------------------------------------------------
AttributeError Traceback (most recent call last)
/home/harish/anaconda3/envs/facial_env/lib/python3.4/site-packages/IPython/core/formatters.py in __call__(self, obj)
880 method = get_real_method(obj, self.print_method)
881 if method is not None:
--> 882 method()
883 return True
884
/home/harish/anaconda3/envs/facial_env/lib/python3.4/site-packages/ipywidgets/widgets/widget.py in _ipython_display_(self, **kwargs)
480 loud_error('The installed widget Javascript is the wrong version.')
481
--> 482 self._send({"method": "display"})
483 self._handle_displayed(**kwargs)
484
/home/harish/anaconda3/envs/facial_env/lib/python3.4/site-packages/ipywidgets/widgets/widget.py in _send(self, msg, buffers)
485 def _send(self, msg, buffers=None):
486 """Sends a message to the model in the front-end."""
--> 487 self.comm.send(data=msg, buffers=buffers)
488
489
/home/harish/anaconda3/envs/facial_env/lib/python3.4/site-packages/ipykernel/comm/comm.py in send(self, data, metadata, buffers)
119 """Send a message to the frontend-side version of this comm"""
120 self._publish_msg('comm_msg',
--> 121 data=data, metadata=metadata, buffers=buffers,
122 )
123
/home/harish/anaconda3/envs/facial_env/lib/python3.4/site-packages/ipykernel/comm/comm.py in _publish_msg(self, msg_type, data, metadata, buffers, **keys)
64 metadata = {} if metadata is None else metadata
65 content = json_clean(dict(data=data, comm_id=self.comm_id, **keys))
---> 66 self.kernel.session.send(self.kernel.iopub_socket, msg_type,
67 content,
68 metadata=json_clean(metadata),
AttributeError: 'NoneType' object has no attribute 'session'
<ipywidgets.widgets.widget_button.Button at 0x7f0de5ebfb38>
Widget Javascript not detected. It may not be installed properly. Did you enable the widgetsnbextension? If not, then run "jupyter nbextension enable --py --sys-prefix widgetsnbextension"
---------------------------------------------------------------------------
AttributeError Traceback (most recent call last)
/home/harish/anaconda3/envs/facial_env/lib/python3.4/site-packages/IPython/core/formatters.py in __call__(self, obj)
880 method = get_real_method(obj, self.print_method)
881 if method is not None:
--> 882 method()
883 return True
884
/home/harish/anaconda3/envs/facial_env/lib/python3.4/site-packages/ipywidgets/widgets/widget.py in _ipython_display_(self, **kwargs)
480 loud_error('The installed widget Javascript is the wrong version.')
481
--> 482 self._send({"method": "display"})
483 self._handle_displayed(**kwargs)
484
/home/harish/anaconda3/envs/facial_env/lib/python3.4/site-packages/ipywidgets/widgets/widget.py in _send(self, msg, buffers)
485 def _send(self, msg, buffers=None):
486 """Sends a message to the model in the front-end."""
--> 487 self.comm.send(data=msg, buffers=buffers)
488
489
/home/harish/anaconda3/envs/facial_env/lib/python3.4/site-packages/ipykernel/comm/comm.py in send(self, data, metadata, buffers)
119 """Send a message to the frontend-side version of this comm"""
120 self._publish_msg('comm_msg',
--> 121 data=data, metadata=metadata, buffers=buffers,
122 )
123
/home/harish/anaconda3/envs/facial_env/lib/python3.4/site-packages/ipykernel/comm/comm.py in _publish_msg(self, msg_type, data, metadata, buffers, **keys)
64 metadata = {} if metadata is None else metadata
65 content = json_clean(dict(data=data, comm_id=self.comm_id, **keys))
---> 66 self.kernel.session.send(self.kernel.iopub_socket, msg_type,
67 content,
68 metadata=json_clean(metadata),
AttributeError: 'NoneType' object has no attribute 'session'
<ipywidgets.widgets.widget_button.Button at 0x7f0ddadc2cc0>

Answer 1

From user6764549 comments:
Ubuntu terminal cannot support interactive widgets. You need to run it in a "browser"-like or GUI enabled environment that can run Javascript.
Jupyter notebook is not the problem, Ubuntu terminal is the problem. It does not support displaying images or widgets. If you are only trying to avoid using a browser, you can look at Jupyter Qt console or Spyder.