ModuleNotFoundError: No module named 'blinker'

Running this demo (or any other) produces this error:

(py37) >streamlit hello
Traceback (most recent call last):
  File "c:me\anaconda3\envs\py37\lib\runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "c:me\anaconda3\envs\py37\lib\runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "C:me\Anaconda3\envs\py37\Scripts\streamlit.exe\__main__.py", line 5, in <module>
  File "c:me\anaconda3\envs\py37\lib\site-packages\streamlit\__init__.py", line 51, in <module>
    from streamlit import config as _config
  File "c:me\anaconda3\envs\py37\lib\site-packages\streamlit\config.py", line 25, in <module>
    from blinker import Signal
ModuleNotFoundError: No module named 'blinker'

The streamlit & blinker entries in my environment (py37):

# Name                    Version                   Build  Channel
streamlit                 0.62.0                   pypi_0    pypi
blinker                     1.4                    pypi_0    pypi

Conda info:

     active environment : py37
    active env location : C:me\Anaconda3\envs\py37
            shell level : 2
       user config file : C:me\.condarc
 populated config files : C:me\.condarc
          conda version : 4.8.3
    conda-build version : 3.18.8
         python version : 3.7.3.final.0
       virtual packages : __cuda=10.1
       base environment : C:me\Anaconda3  (writable)
           channel URLs : https://conda.anaconda.org/conda-forge/win-64
                          https://conda.anaconda.org/conda-forge/noarch
                          https://repo.anaconda.com/pkgs/main/win-64
                          https://repo.anaconda.com/pkgs/main/noarch
                          https://repo.anaconda.com/pkgs/r/win-64
                          https://repo.anaconda.com/pkgs/r/noarch
                          https://repo.anaconda.com/pkgs/msys2/win-64
                          https://repo.anaconda.com/pkgs/msys2/noarch
          package cache : C:me\Anaconda3\pkgs
                          C:me\.conda\pkgs
                          C:me\AppData\Local\conda\conda\pkgs
       envs directories : C:me\Anaconda3\envs
                          C:me\.conda\envs
                          C:me\AppData\Local\conda\conda\envs
               platform : win-64
             user-agent : conda/4.8.3 requests/2.23.0 CPython/3.7.3 Windows/10 Windows/10.0.18362
          administrator : False
             netrc file : None
           offline mode : False

Is there a solution?

Hi @CatChenal -

We did a patch release to the 0.62 release, and while I don’t know what it fixed, you might try to upgrade to see if that fixes it. Or skip to 0.63 that was released yesterday.

Best,
Randy

I tried with 0.63: same outcome.

Unfortunately, I think it suggests your environment is messed up. From a freshly build environment, it works for me

(base) C:\Users\randy>conda create -n py37 python=3.7 -y
Collecting package metadata (current_repodata.json): done
Solving environment: done


==> WARNING: A newer version of conda exists. <==
  current version: 4.8.2
  latest version: 4.8.3

Please update conda by running

    $ conda update -n base -c defaults conda



## Package Plan ##

  environment location: C:\Users\randy\anaconda3\envs\py37

  added / updated specs:
    - python=3.7


The following packages will be downloaded:

    package                    |            build
    ---------------------------|-----------------
    ca-certificates-2020.6.24  |                0         125 KB
    certifi-2020.6.20          |           py37_0         156 KB
    openssl-1.1.1g             |       he774522_0         4.8 MB
    pip-20.1.1                 |           py37_1         1.7 MB
    python-3.7.7               |       h81c818b_4        14.3 MB
    setuptools-49.2.0          |           py37_0         760 KB
    sqlite-3.32.3              |       h2a8f88b_0         802 KB
    vs2015_runtime-14.16.27012 |       hf0eaf9b_3         1.2 MB
    zlib-1.2.11                |       h62dcd97_4         113 KB
    ------------------------------------------------------------
                                           Total:        24.0 MB

The following NEW packages will be INSTALLED:

  ca-certificates    pkgs/main/win-64::ca-certificates-2020.6.24-0
  certifi            pkgs/main/win-64::certifi-2020.6.20-py37_0
  openssl            pkgs/main/win-64::openssl-1.1.1g-he774522_0
  pip                pkgs/main/win-64::pip-20.1.1-py37_1
  python             pkgs/main/win-64::python-3.7.7-h81c818b_4
  setuptools         pkgs/main/win-64::setuptools-49.2.0-py37_0
  sqlite             pkgs/main/win-64::sqlite-3.32.3-h2a8f88b_0
  vc                 pkgs/main/win-64::vc-14.1-h0510ff6_4
  vs2015_runtime     pkgs/main/win-64::vs2015_runtime-14.16.27012-hf0eaf9b_3
  wheel              pkgs/main/win-64::wheel-0.34.2-py37_0
  wincertstore       pkgs/main/win-64::wincertstore-0.2-py37_0
  zlib               pkgs/main/win-64::zlib-1.2.11-h62dcd97_4



Downloading and Extracting Packages
ca-certificates-2020 | 125 KB    | ############################################################################ | 100%
pip-20.1.1           | 1.7 MB    | ############################################################################ | 100%
openssl-1.1.1g       | 4.8 MB    | ############################################################################ | 100%
python-3.7.7         | 14.3 MB   | ############################################################################ | 100%
certifi-2020.6.20    | 156 KB    | ############################################################################ | 100%
vs2015_runtime-14.16 | 1.2 MB    | ############################################################################ | 100%
sqlite-3.32.3        | 802 KB    | ############################################################################ | 100%
setuptools-49.2.0    | 760 KB    | ############################################################################ | 100%
zlib-1.2.11          | 113 KB    | ######################################################################################################### | 100%
Preparing transaction: done
Verifying transaction: done
Executing transaction: done
#
# To activate this environment, use
#
#     $ conda activate py37
#
# To deactivate an active environment, use
#
#     $ conda deactivate


(base) C:\Users\randy>conda activate py37

(py37) C:\Users\randy>pip install streamlit
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Building wheels for collected packages: watchdog, blinker, validators, pathtools, toolz, pyrsistent, pandocfilters
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Installing collected packages: six, python-dateutil, numpy, pytz, pandas, jmespath, urllib3, docutils, botocore, s3transfer, boto3, base58, pathtools, watchdog, pyparsing, packaging, toml, astor, blinker, decorator, validators, pygments, wcwidth, prompt-toolkit, backcall, ipython-genutils, traitlets, parso, jedi, colorama, pickleshare, ipython, tornado, pyzmq, pywin32, jupyter-core, jupyter-client, ipykernel, attrs, pyrsistent, zipp, importlib-metadata, jsonschema, nbformat, prometheus-client, pywinpty, terminado, Send2Trash, pandocfilters, testpath, entrypoints, mistune, defusedxml, webencodings, bleach, MarkupSafe, jinja2, nbconvert, notebook, widgetsnbextension, ipywidgets, pydeck, click, cachetools, toolz, altair, protobuf, enum-compat, pyarrow, idna, chardet, requests, tzlocal, pillow, streamlit
Successfully installed MarkupSafe-1.1.1 Send2Trash-1.5.0 altair-4.1.0 astor-0.8.1 attrs-19.3.0 backcall-0.2.0 base58-2.0.1 bleach-3.1.5 blinker-1.4 boto3-1.14.21 botocore-1.17.21 cachetools-4.1.1 chardet-3.0.4 click-7.1.2 colorama-0.4.3 decorator-4.4.2 defusedxml-0.6.0 docutils-0.15.2 entrypoints-0.3 enum-compat-0.0.3 idna-2.10 importlib-metadata-1.7.0 ipykernel-5.3.2 ipython-7.16.1 ipython-genutils-0.2.0 ipywidgets-7.5.1 jedi-0.17.1 jinja2-2.11.2 jmespath-0.10.0 jsonschema-3.2.0 jupyter-client-6.1.6 jupyter-core-4.6.3 mistune-0.8.4 nbconvert-5.6.1 nbformat-5.0.7 notebook-6.0.3 numpy-1.19.0 packaging-20.4 pandas-1.0.5 pandocfilters-1.4.2 parso-0.7.0 pathtools-0.1.2 pickleshare-0.7.5 pillow-7.2.0 prometheus-client-0.8.0 prompt-toolkit-3.0.5 protobuf-3.12.2 pyarrow-0.17.1 pydeck-0.4.0b2 pygments-2.6.1 pyparsing-2.4.7 pyrsistent-0.16.0 python-dateutil-2.8.1 pytz-2020.1 pywin32-228 pywinpty-0.5.7 pyzmq-19.0.1 requests-2.24.0 s3transfer-0.3.3 six-1.15.0 streamlit-0.63.0 terminado-0.8.3 testpath-0.4.4 toml-0.10.1 toolz-0.10.0 tornado-6.0.4 traitlets-4.3.3 tzlocal-2.1 urllib3-1.25.9 validators-0.16.0 watchdog-0.10.3 wcwidth-0.2.5 webencodings-0.5.1 widgetsnbextension-3.5.1 zipp-3.1.0

(py37) C:\Users\randy>streamlit hello

  Welcome to Streamlit!

  If you're one of our development partners or you're interested in getting
  personal technical support or Streamlit updates, please enter your email
  address below. Otherwise, you may leave the field blank.

  Email:

  Privacy Policy:
  As an open source project, we collect usage statistics. We cannot see and do
  not store information contained in Streamlit apps. You can find out more by
  reading our privacy policy at: https://streamlit.io/privacy-policy

  If you'd like to opt out of usage statistics, add the following to
  %userprofile%/.streamlit/config.toml, creating that file if necessary:

    [browser]
    gatherUsageStats = false


  Welcome to Streamlit. Check out our demo in your browser.

  Local URL: http://localhost:8501
  Network URL: http://10.0.2.15:8501

  Ready to create your own Python apps super quickly?
  Just head over to https://docs.streamlit.io

  May you create awesome apps!