gistfile1.txt

ImportError                               Traceback (most recent call last)
<ipython-input-1-e19bbed7988a> in <module>()
----> 1 import ipytracer
      2 from IPython.core.display import display
      3 
      4 def bubble_sort(unsorted_list):
      5     x = ipytracer.ChartTracer(unsorted_list)

/Users/liavkoren/Envs/coding-university/lib/python3.6/site-packages/ipytracer/__init__.py in <module>()
     14 """
     15 
---> 16 from .tracer import *
     17 from ._version import __version__
     18 

/Users/liavkoren/Envs/coding-university/lib/python3.6/site-packages/ipytracer/tracer.py in <module>()
      4 from IPython.core.display import display
      5 from .model import *
----> 6 from .view import *
      7 import time
      8 

/Users/liavkoren/Envs/coding-university/lib/python3.6/site-packages/ipytracer/view.py in <module>()
      2 # Copyright (c) Han Lee.
      3 # Distributed under the terms of the Modified BSD License.
----> 4 from ipywidgets import (
      5     DOMWidget,
      6     Layout

/Users/liavkoren/Envs/coding-university/lib/python3.6/site-packages/ipywidgets/__init__.py in <module>()
     23 from IPython import get_ipython
     24 from ._version import version_info, __version__, __frontend_version__
---> 25 from .widgets import *
     26 
     27 

/Users/liavkoren/Envs/coding-university/lib/python3.6/site-packages/ipywidgets/widgets/__init__.py in <module>()
      2 # Distributed under the terms of the Modified BSD License.
      3 
----> 4 from .widget import Widget, CallbackDispatcher, register, widget_serialization, handle_version_comm_opened
      5 from .domwidget import DOMWidget
      6 from .valuewidget import ValueWidget

/Users/liavkoren/Envs/coding-university/lib/python3.6/site-packages/ipywidgets/widgets/widget.py in <module>()
     14 from traitlets.config import LoggingConfigurable
     15 from traitlets.utils.importstring import import_item
---> 16 from traitlets import Unicode, Dict, Instance, List, Int, Set, Bytes, observe, default
     17 from ipython_genutils.py3compat import string_types, PY3
     18 from IPython.display import display

ImportError: cannot import name 'observe'


$ pip freeze
appnope==0.1.0
bleach==2.0.0
decorator==4.0.11
entrypoints==0.2.3
html5lib==0.999999999
ipykernel==4.6.1
ipython==6.1.0
ipython-genutils==0.2.0
ipytracer==0.2.2.post1
ipywidgets==6.0.0
jedi==0.10.2
Jinja2==2.9.6
jsonschema==2.6.0
jupyter==1.0.0
jupyter-client==5.0.1
jupyter-console==5.1.0
jupyter-core==4.3.0
MarkupSafe==1.0
mistune==0.7.4
nbconvert==5.2.1
nbformat==4.3.0
notebook==5.0.0
pandocfilters==1.4.1
pexpect==4.2.1
pickleshare==0.7.4
prompt-toolkit==1.0.14
ptyprocess==0.5.1
Pygments==2.2.0
python-dateutil==2.6.0
pyzmq==16.0.2
qtconsole==4.3.0
simplegeneric==0.8.1
six==1.10.0
terminado==0.6
testpath==0.3.1
tornado==4.5.1
traitlets==4.3.2
wcwidth==0.1.7
webencodings==0.5.1
widgetsnbextension==2.0.0