ModuleNotFoundError: No module named 'slack'

Couldn’t find module named ‘slack’ after I pip3 install slackclient.

$ pip3 list
Package        Version
-------------- -------
...
slack          0.0.2
slackclient    2.5.0
...
$ python3
Python 3.7.0 (v3.7.0:1bf9cc5093, Jun 26 2018, 23:26:24)
[Clang 6.0 (clang-600.0.57)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import slack
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ModuleNotFoundError: No module named 'slack'
>>> exit()

Issue Analytics

State:
Created 3 years ago
Comments:6 (3 by maintainers)

Top GitHub Comments

1reaction

koenzhaocommented, May 3, 2020

At least having slack PyPI package prevents you from loading slack package after resolving the issue described here. So, please uninstall it anyways.

>>> import slack
>>> from slack import WebClient
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: cannot import name 'WebClient' from 'slack' (/Users/ksera/.pyenv/versions/3.8.2/lib/python3.8/site-packages/slack/__init__.py)
>>> slack.
slack.ComponentNotRegisteredError(  slack.ParamterMissingError(         slack.inspect                       slack.partial(                      
slack.Container(                    slack.defaultdict(                  slack.invoke(                       
>>> slack.
slack.ComponentNotRegisteredError(  slack.ParamterMissingError(         slack.inspect                       slack.partial(                      
slack.Container(                    slack.defaultdict(                  slack.invoke(

Do you use anaconda or others for Python installation? If you go with a straight-forward way (e.g., pyenv + virtualenv or venv), you can smoothly install the package.

You don’t need to use pyenv if you prefer others but the following steps should be much easier.

$ brew install pyenv
$ pyenv install 3.7.0
$ pyenv local 3.7.0
$ python --version
Python 3.7.0
$ python -m venv env
$ source env/bin/activate
(env) $ pip install slackclient
(env) $ pip list
Package       Version
------------- -------
aiohttp       3.6.2  
async-timeout 3.0.1  
attrs         19.3.0 
chardet       3.0.4  
idna          2.9    
multidict     4.7.5  
pip           10.0.1 
setuptools    39.0.1 
slackclient   2.5.0  
yarl          1.4.2  
(env) $ python
Python 3.7.0 (default, May  3 2020, 12:54:06) 
[Clang 11.0.0 (clang-1100.0.33.8)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import slack
>>> from slack import WebClient
>>> slack.__file__
'/path-to-project/env/lib/python3.7/site-packages/slack/__init__.py'

Thanks for your reply, @seratch It work for me under virtual environment of python. Verify to close this issue.

1reaction

seratchcommented, May 3, 2020

At least having slack PyPI package prevents you from loading slack package after resolving the issue described here. So, please uninstall it anyways.

>>> import slack
>>> from slack import WebClient
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: cannot import name 'WebClient' from 'slack' (/Users/ksera/.pyenv/versions/3.8.2/lib/python3.8/site-packages/slack/__init__.py)
>>> slack.
slack.ComponentNotRegisteredError(  slack.ParamterMissingError(         slack.inspect                       slack.partial(                      
slack.Container(                    slack.defaultdict(                  slack.invoke(                       
>>> slack.
slack.ComponentNotRegisteredError(  slack.ParamterMissingError(         slack.inspect                       slack.partial(                      
slack.Container(                    slack.defaultdict(                  slack.invoke(

Do you use anaconda or others for Python installation? If you go with a straight-forward way (e.g., pyenv + virtualenv or venv), you can smoothly install the package.

You don’t need to use pyenv if you prefer others but the following steps should be much easier.

$ brew install pyenv
$ pyenv install 3.7.0
$ pyenv local 3.7.0
$ python --version
Python 3.7.0
$ python -m venv env
$ source env/bin/activate
(env) $ pip install slackclient
(env) $ pip list
Package       Version
------------- -------
aiohttp       3.6.2  
async-timeout 3.0.1  
attrs         19.3.0 
chardet       3.0.4  
idna          2.9    
multidict     4.7.5  
pip           10.0.1 
setuptools    39.0.1 
slackclient   2.5.0  
yarl          1.4.2  
(env) $ python
Python 3.7.0 (default, May  3 2020, 12:54:06) 
[Clang 11.0.0 (clang-1100.0.33.8)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import slack
>>> from slack import WebClient
>>> slack.__file__
'/path-to-project/env/lib/python3.7/site-packages/slack/__init__.py'