ModuleNotFoundError: No module named 'blinker'

Using Streamlit
1

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?

2

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

3

I tried with 0.63: same outcome.

4

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
Collecting streamlit
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     |████████████████████████████████| 7.2 MB 2.2 MB/s
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Requirement already satisfied: setuptools in c:\users\randy\anaconda3\envs\py37\lib\site-packages (from protobuf>=3.6.0->streamlit) (49.2.0.post20200714)
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Requirement already satisfied: certifi>=2017.4.17 in c:\users\randy\anaconda3\envs\py37\lib\site-packages (from requests->streamlit) (2020.6.20)
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Collecting webencodings
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Building wheels for collected packages: watchdog, blinker, validators, pathtools, toolz, pyrsistent, pandocfilters
  Building wheel for watchdog (setup.py) ... done
  Created wheel for watchdog: filename=watchdog-0.10.3-py3-none-any.whl size=73875 sha256=7920a7b59d2999dcda8a3f42a51e75263f4ef03f6ef2bec0966acf798932e60e
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  Building wheel for blinker (setup.py) ... done
  Created wheel for blinker: filename=blinker-1.4-py3-none-any.whl size=13455 sha256=70f96290c70a8eba135037cad9daceec426c38c66c8ef13d941240fd820a01ed
  Stored in directory: c:\users\randy\appdata\local\pip\cache\wheels\22\f5\18\df711b66eb25b21325c132757d4314db9ac5e8dabeaf196eab
  Building wheel for validators (setup.py) ... done
  Created wheel for validators: filename=validators-0.16.0-py3-none-any.whl size=18413 sha256=180733c6ec37dbbed93166673056c7450b325b8ff48e34b0183d1cd00079f3d8
  Stored in directory: c:\users\randy\appdata\local\pip\cache\wheels\38\f6\3c\5b82677e8a1b2ca411c2c10ac379dd894207329736f1ec9047
  Building wheel for pathtools (setup.py) ... done
  Created wheel for pathtools: filename=pathtools-0.1.2-py3-none-any.whl size=8790 sha256=d9faefbd3ef192e76540d83bd771039fc69220ef1b6d7749904b3d5cb4265235
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  Building wheel for toolz (setup.py) ... done
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  Stored in directory: c:\users\randy\appdata\local\pip\cache\wheels\e2\83\7c\248063997a4f9ff6bf145822e620e8c37117a6b4c765584077
  Building wheel for pyrsistent (setup.py) ... done
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Successfully built watchdog blinker validators pathtools toolz pyrsistent pandocfilters
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
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  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!