hi all, I am suffering from the same issue.  my conda environment was 
activated and related packages installed are listed as below:

# Name                    Version                   Build  Channel
_tflow_select             2.2.0                     eigen  
absl-py                   0.9.0                    pypi_0    pypi
appnope                   0.1.0                    pypi_0    pypi
astor                     0.8.1                    pypi_0    pypi
attrs                     19.3.0                     py_0    conda-forge
backcall                  0.1.0                      py_0    conda-forge
blas                      1.0                         mkl  
bleach                    3.1.0                      py_0    conda-forge
c-ares                    1.15.0            h1de35cc_1001  
ca-certificates           2019.11.27                    0  
cachetools                4.0.0                    pypi_0    pypi
certifi                   2019.11.28               py36_0  
chardet                   3.0.4                    pypi_0    pypi
cycler                    0.10.0                   pypi_0    pypi
dbus                      1.13.12              h90a0687_0  
decorator                 4.4.1                      py_0    conda-forge
defusedxml                0.6.0                      py_0    conda-forge
entrypoints               0.3                   py36_1000    conda-forge
expat                     2.2.6                h0a44026_0  
ganofficial               0.0.0                     dev_0    <develop>
gast                      0.2.2                    pypi_0    pypi
gettext                   0.19.8.1             h15daf44_3  
glib                      2.63.1               hd977a24_0  
gnureadline               8.0.0                    pypi_0    pypi
google-auth               1.10.0                   pypi_0    pypi
google-auth-oauthlib      0.4.1                    pypi_0    pypi
google-pasta              0.1.8                    pypi_0    pypi
gpy                       1.9.9                    pypi_0    pypi
grpcio                    1.26.0                   pypi_0    pypi
h5py                      2.10.0                   pypi_0    pypi
icu                       58.2                 h4b95b61_1  
idna                      2.8                      pypi_0    pypi
importlib_metadata        1.3.0                    py36_0    conda-forge
intel-openmp              2019.4                      233  
ipykernel                 5.1.3            py36h5ca1d4c_0    conda-forge
ipython                   3.2.1                    pypi_0    pypi
ipython-genutils          0.2.0                    pypi_0    pypi
ipython_genutils          0.2.0                      py_1    conda-forge
ipywidgets                7.5.1                      py_0  
jedi                      0.15.2                   py36_0    conda-forge
jinja2                    2.10.3                     py_0    conda-forge
joblib                    0.14.1                   pypi_0    pypi
jpeg                      9b                   he5867d9_2  
json5                     0.8.5                      py_0    conda-forge
jsonschema                3.2.0                    py36_0    conda-forge
jupyter                   1.0.0                    py36_7  
jupyter-console           6.0.0                    pypi_0    pypi
jupyter_client            5.3.4                    py36_0    conda-forge
jupyter_console           6.0.0                    py36_0  
jupyter_core              4.6.1                    py36_0    conda-forge
jupyterlab                1.2.4                      py_0    conda-forge
jupyterlab_server         1.0.6                      py_0    conda-forge
keras                     2.3.1                    pypi_0    pypi
keras-applications        1.0.8                    pypi_0    pypi
keras-preprocessing       1.1.0                    pypi_0    pypi
kiwisolver                1.1.0                    pypi_0    pypi
libcxx                    4.0.1                hcfea43d_1  
libcxxabi                 4.0.1                hcfea43d_1  
libedit                   3.1.20181209         hb402a30_0  
libffi                    3.2.1                h475c297_4  
libgfortran               3.0.1                h93005f0_2  
libiconv                  1.15                 hdd342a3_7  
libpng                    1.6.37               ha441bb4_0  
libprotobuf               3.11.2               hd9629dc_0  
libsodium                 1.0.17               h01d97ff_0    conda-forge
markdown                  3.1.1                    py36_0  
markupsafe                1.1.1            py36h0b31af3_0    conda-forge
matplotlib                3.1.2                    pypi_0    pypi
mistune                   0.8.4           py36h0b31af3_1000    conda-forge
mkl                       2019.4                      233  
mkl-service               2.3.0            py36hfbe908c_0  
mkl_fft                   1.0.15           py36h5e564d8_0  
mkl_random                1.1.0            py36ha771720_0  
more-itertools            8.0.2                      py_0    conda-forge
nbconvert                 5.6.1                    py36_0    conda-forge
nbformat                  5.0.3                      py_0    conda-forge
ncurses                   6.1                  h0a44026_1  
notebook                  4.0.0                    pypi_0    pypi
numpy                     1.18.1                   pypi_0    pypi
numpy-base                1.17.4           py36h6575580_0  
oauthlib                  3.1.0                    pypi_0    pypi
openssl                   1.1.1d               h1de35cc_3  
opt-einsum                3.1.0                    pypi_0    pypi
pandas                    0.25.3                   pypi_0    pypi
pandoc                    2.9.1.1                       0    conda-forge
pandocfilters             1.4.2                    pypi_0    pypi
paramz                    0.9.5                    pypi_0    pypi
parso                     0.5.2                      py_0    conda-forge
pcre                      8.43                 h0a44026_0  
pexpect                   4.7.0                    py36_0    conda-forge
pickleshare               0.7.5                    pypi_0    pypi
pip                       19.3.1                   py36_0  
prometheus_client         0.7.1                      py_0    conda-forge
prompt-toolkit            2.0.10                   pypi_0    pypi
prompt_toolkit            2.0.9                    py36_0  
protobuf                  3.11.2                   pypi_0    pypi
ptyprocess                0.6.0                   py_1001    conda-forge
pyasn1                    0.4.8                    pypi_0    pypi
pyasn1-modules            0.2.8                    pypi_0    pypi
pygments                  2.5.2                      py_0    conda-forge
pyparsing                 2.4.6                    pypi_0    pypi
pyqt                      5.9.2            py36h655552a_2  
pyrsistent                0.15.7           py36h0b31af3_0    conda-forge
python                    3.6.10               h359304d_0  
python-dateutil           2.8.1                      py_0    conda-forge
pytz                      2019.3                   pypi_0    pypi
pyyaml                    5.3                      pypi_0    pypi
pyzmq                     18.1.1                   pypi_0    pypi
qt                        5.9.7                h468cd18_1  
qtconsole                 4.6.0                      py_1  
readline                  7.0                  h1de35cc_5  
requests                  2.22.0                   pypi_0    pypi
requests-oauthlib         1.3.0                    pypi_0    pypi
rsa                       4.0                      pypi_0    pypi
scikit-learn              0.22.1                   pypi_0    pypi
scipy                     1.4.1                    pypi_0    pypi
send2trash                1.5.0                      py_0    conda-forge
setuptools                44.0.0                   py36_0  
sip                       4.19.8           py36h0a44026_0  
six                       1.13.0                   py36_0    conda-forge
sklearn                   0.0                      pypi_0    pypi
sqlite                    3.30.1               ha441bb4_0  
tensorboard               2.1.0                    pypi_0    pypi
tensorflow                2.1.0                    pypi_0    pypi
tensorflow-base           1.10.0          eigen_py36h4f0eeca_0  
tensorflow-estimator      2.1.0                    pypi_0    pypi
termcolor                 1.1.0                    pypi_0    pypi
terminado                 0.8.3                    pypi_0    pypi
testpath                  0.4.4                      py_0    conda-forge
tk                        8.6.8                ha441bb4_0  
tornado                   6.0.3            py36h0b31af3_0    conda-forge
traitlets                 4.3.3                    py36_0    conda-forge
urllib3                   1.25.7                   pypi_0    pypi
wcwidth                   0.1.8                      py_0    conda-forge
webencodings              0.5.1                    pypi_0    pypi
werkzeug                  0.16.0                     py_0  
wheel                     0.33.6                   py36_0  
widgetsnbextension        3.5.1                    py36_0  
wrapt                     1.11.2                   pypi_0    pypi
xz                        5.2.4                h1de35cc_4  
zeromq                    4.3.2                h6de7cb9_2    conda-forge
zipp                      0.6.0                      py_0    conda-forge
zlib                      1.2.11               h1de35cc_3  

when I ran a ipynb file, I 've got error from the server log

/Users/zhongsheng/anaconda2/envs/ganRegression/bin/jupyter notebook 
--no-browser
Traceback (most recent call last):
  File 
"/Users/zhongsheng/anaconda2/envs/ganRegression/bin/jupyter-notebook", line 
7, in <module>
    from notebook.notebookapp import main
ModuleNotFoundError: No module named 'notebook.notebookapp'

Process finished with exit code 1

can anyone can help me with this issue?





On Friday, October 18, 2019 at 1:56:19 AM UTC+8, Jason Grout wrote:
>
> It sounds like your install is messed up, and you have two environments 
> layered on top of each other (perhaps you have a system install and an 
> anaconda install?). The __file__ trick helps you see what is actually being 
> run.
>
> Jason
>
> On Thu, Oct 17, 2019 at 10:33 AM brian piercy <[email protected] 
> <javascript:>> wrote:
>
>> more info:
>>
>> 'python' loads w/o problem. (interesting, though, it loads using 3.5.2, 
>> default, 2018/11/12.)
>> 'ipython' however, loads with python 2.7.12 & iPython 5.8.0. 
>>
>> no wonder Jupyter is confused.
>>
>>
>> On Thursday, October 17, 2019 at 10:53:07 AM UTC-5, brian piercy wrote:
>>>
>>>
>>>    - rebuilding after a crash. i started via a fresh Anaconda download. 
>>>    Here's the results of 'jupyter --version"
>>>
>>>
>>>    - bjpcjp@bjpcjp-Lenovo-Z710:~$ jupyter --version
>>>    - jupyter core : 4.6.0
>>>    - jupyter-notebook : 6.0.1
>>>    - qtconsole : 4.5.5
>>>    - ipython : 7.8.0
>>>    - ipykernel : 5.1.2
>>>    - jupyter client : 5.3.4
>>>    - jupyter lab : not installed ('conda install jupyterlab' returns 
>>>    "all packages already installed")
>>>    - nbconvert : 5.6.0
>>>    - ipywidgets : 7.5.1
>>>    - nbformat : 4.4.0
>>>    - traitlets : 4.3.3
>>>
>>>
>>>    - I get the error msg shown in the title, despite multiple 
>>>    reinstalls, via "jupyter notebook".
>>>
>>> according to 'conda info':
>>>
>>>    - no active environment
>>>    - conda 4.7, conda-build 3.18, python 3.7.4.
>>>    - channel URLs listed
>>>    - package caches present; envs directories present; linux-64 
>>>    platform.
>>>
>>> ideas? Thank you. (also posted in GitHub 
>>> <https://github.com/jupyter/notebook/issues/4982>, FYI.)
>>>
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>>
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