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Problem launching Jupyter Notebook from Anaconda

I am having issues launching Jupyter Notebook. I have tried to do it two ways and seem to get errors.
1 - Launching from the Anaconda Prompt using the command jupyter notebook or directly choosing from the Anaconda menu
I get the following:
(base) C:\Users\metni>jupyter notebook
Traceback (most recent call last):
File "C:\Users\metni\anaconda3\lib\site-packages\jsonschema\__init__.py", line 31, in <module>
from importlib import metadata
ImportError: cannot import name 'metadata' from 'importlib' (C:\Users\metni\anaconda3\lib\importlib\__init__.py)
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "C:\Users\metni\anaconda3\lib\site-packages\nbformat\validator.py", line 12, in <module>
from jsonschema import ValidationError
File "C:\Users\metni\anaconda3\lib\site-packages\jsonschema\__init__.py", line 33, in <module>
import importlib_metadata as metadata
ModuleNotFoundError: No module named 'importlib_metadata'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "C:\Users\metni\anaconda3\Scripts\jupyter-notebook-script.py", line 6, in <module>
from notebook.notebookapp import main
File "C:\Users\metni\anaconda3\lib\site-packages\notebook\notebookapp.py", line 80, in <module>
from .services.contents.manager import ContentsManager
File "C:\Users\metni\anaconda3\lib\site-packages\notebook\services\contents\manager.py", line 17, in <module>
from nbformat import sign, validate as validate_nb, ValidationError
File "C:\Users\metni\anaconda3\lib\site-packages\nbformat\__init__.py", line 32, in <module>
from .validator import validate, ValidationError
File "C:\Users\metni\anaconda3\lib\site-packages\nbformat\validator.py", line 23, in <module>
raise ImportError(str(e) + verbose_msg)
ImportError: No module named 'importlib_metadata'
Jupyter notebook format depends on the jsonschema package:
https://pypi.python.org/pypi/jsonschema
Please install it first.
2 - Launching from the command line with the same command
I get the following:
C:\Users\metni>jupyter notebook
Traceback (most recent call last):
File "C:\Users\metni\anaconda3\Scripts\jupyter-notebook-script.py", line 6, in <module>
from notebook.notebookapp import main
File "C:\Users\metni\anaconda3\lib\site-packages\notebook\notebookapp.py", line 64, in <module>
from tornado import httpserver
File "C:\Users\metni\anaconda3\lib\site-packages\tornado\httpserver.py", line 29, in <module>
import ssl
File "C:\Users\metni\anaconda3\lib\ssl.py", line 98, in <module>
import _ssl # if we can't import it, let the error propagate
ImportError: DLL load failed: The specified module could not be found.
It seems like this is referring to a package called jsonschema which is not installed apparently, but running a pip install jsonschema does not solve the problem for me...

In the answer above I also have two two commands but they are a bit different
source /opt/anaconda/bin/activate root
and then
jupyter notebook
It seems like you have to go into your anaconda directory then bin, then you can
"activate root"
It also looks like you need to install some other dependencies for jupyter to run. Where is says
Jupyter notebook format depends on the jsonschema package:
https://pypi.python.org/pypi/jsonschema
Please install it first.
So if the above doesn't work try installing the other dependency and try again

Based on this answer from a similar question, I managed to solve the problem by running these two commands:
conda update -n root conda
conda update --all
I thus updated all packages, and the notebook is now launching.

Failed to import dataclasses module

Today I installed python 3.7 from apt-get to try out the new dataclasses module. I installed it seperately because python3.6 wasn't upgradeable to 3.7.
When I type: python3.7 --version, it gives me: >>> Python 3.7.0a2 as my current version.
The problem is that I can't seem to import dataclasses.
my import statement is: from dataclasses import dataclass as instructed here
This is the error message it's giving me:
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ModuleNotFoundError: No module named 'dataclasses'
Error in sys.excepthook:
Traceback (most recent call last):
File "/usr/lib/python3/dist-packages/apport_python_hook.py", line 63, in apport_excepthook
from apport.fileutils import likely_packaged, get_recent_crashes
File "/usr/lib/python3/dist-packages/apport/__init__.py", line 5, in <module>
from apport.report import Report
File "/usr/lib/python3/dist-packages/apport/report.py", line 30, in <module>
import apport.fileutils
File "/usr/lib/python3/dist-packages/apport/fileutils.py", line 23, in <module>
from apport.packaging_impl import impl as packaging
File "/usr/lib/python3/dist-packages/apport/packaging_impl.py", line 24, in <module>
import apt
File "/usr/lib/python3/dist-packages/apt/__init__.py", line 23, in <module>
import apt_pkg
ModuleNotFoundError: No module named 'apt_pkg'
Original exception was:
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ModuleNotFoundError: No module named 'dataclasses'
I even tried installing the dataclasses module with pip3: pip3 install dataclasses. Not sure if that's necessary though.
Any suggestion on what might be the problem?
[EDIT] Just tried it with a python3.6 console and it worked fine .. weird.

As suggested by #wim python3.7 -m venv venv_dir
This command will:
Use python3.7 to run the command
The -m flag tells the interpreter to run the next argument as a script
venv is a module, and because of the -m flag it will be run as a script
Finally, the venv_dir is given to the venv module as an argument which
this module will use to create a virtual environment directory at
Once this command is run now you'll have a nice sandbox for messing around/testing the dataclasses module.
To activate this virtual environment be sure to run source venv_dir/bin/activate before you begin. This command will run the script at venv_dir/bin/activate to set up the necessary environment variables and other things for you
To deactivate, simply run deactivate after activating

Can't install packages due to "ImportError: No module named six"

I seem to have messed up my python install. I can't install new python packages:
$ pip install arq
Traceback (most recent call last):
File "/usr/local/bin/pip", line 6, in <module>
from pkg_resources import load_entry_point
File "/Users/me/Library/Python/2.7/lib/python/site-packages/pkg_resources/__init__.py", line 48, in <module>
import six
ImportError: No module named six
And trying to address this error directly gives the same error:
$ pip install six
Traceback (most recent call last):
File "/usr/local/bin/pip", line 6, in <module>
from pkg_resources import load_entry_point
File "/Users/me/Library/Python/2.7/lib/python/site-packages/pkg_resources/__init__.py", line 48, in <module>
import six
ImportError: No module named six
I'm not really sure what to do. All pip operations seem to fail for the same reason. pip freeze and just pip give the same result.
I'm on osx.

This is inspired by #Christian Dean's comment. But I am on OSX so what I did was to just reinstall pip from here:
http://pip.readthedocs.io/en/stable/installing/

python setuptools: "No module named version"

I'm trying to install a package using python setup.py build, but it fails when it cannot find setuptools.version. In fact:
import setuptools
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/Users/gpajer/anaconda/lib/python2.7/site- packages/setuptools/__init__.py", line 11, in <module>
import setuptools.version
ImportError: No module named version
Shouldn't there be a file .../anaconda/lib/python2.7/site-packages/setuptools/version.py? There is no such file. Any ideas?

From https://anaconda.org/anaconda/setuptools:
To install this package with conda run:
conda install -c anaconda setuptools=21.2.1

Getting error when importing some package on python scripts

Here is my error:
Traceback (most recent call last):
File "./convert.py", line 6, in <module>
import openpyxl # from https://pythonhosted.org/openpyxl/ or PyPI (e.g. via pip)
ImportError: No module named openpyxl
i have installed the python package openpyxl but this error still appear
Im using linux python version 2.6.6
any help please
i got this new error when i ran the python2.7 script.py:
Traceback (most recent call last):
File "/usr/local/bin/pip", line 7, in <module>
from pip import main
File "/usr/local/lib/python2.7/site-packages/pip/__init__.py", line 13, in <module>
from pip.utils import get_installed_distributions, get_prog
File "/usr/local/lib/python2.7/site-packages/pip/utils/__init__.py", line 15, in <module>
import zipfile
File "/usr/local/lib/python2.7/zipfile.py", line 6, in <module>
import io
File "/usr/local/lib/python2.7/io.py", line 51, in <module>
import _io
ImportError: /usr/local/lib/python2.7/lib-dynload/_io.so: undefined symbol: _PyErr_ReplaceException

openpyxl module has 2 dependent modules : 1. jdcal 2. et_xmlfile
I was able to install openpyxl module and this is what I did :
1.Downloaded the openpyxl,jdcal and et_xmlfile from https://pypi.python.org/pypi and saved jdcal-1.0.tar.gz, et_xmlfile-1.0.0.tar.gz,openpyxl-2.3.0-b2.tar.gz in a local folder in my system.
2.Then I ran the commands in the following order :
pip install jdcal-1.0.tar.gz
pip install et_xmlfile-1.0.0.tar.gz
pip install openpyxl-2.3.0-b2.tar.gz
openpyxl got successfully after this. Please check whether this helps.