The auto completion does not work.

[julioyildo]

Hello !

I'm trying to use the key features of Jupyterlab-lsp, but I'm having some issues : Auto-completion, Continuous Hinting, Rename and Jump to Definition do not works when installing the library.

I have also tried several configurations on the Advanced Setting Editor but without success.

My language server configuration:

And Code Completion:

The only way to make it works was to install pip install git+https://github.com/krassowski/python-language-server.git@main, but the documentation doesn't recommend to use it in production environnement.

Could you please guide me?

Thank you ! :)

[krassowski]

Thank you for opening this issue. I read it carefully but unfortunately, I cannot help much without having the bug report template filled in. It appears that you might have chosen a different template, or deleted it.

The template asks for information that we need in order to be able to help you. We know that this is a big ask, but this helps us diagnose issues quicker and gives us more time to improve this extension. If you have a problem filling it, please let us know and we will try to help (or improve the template if needed).

[julioyildo]

Hi @krassowski ,

Sure ! :)

Description

I'm trying to use the key features of Jupyterlab-lsp, but I'm having some issues: Auto-completion, Continuous Hinting, Rename and Jump to Definition do not work when installing the library.

Reproduce

I just done the basics steps of the library

1. Install Jupyterlab-lsp
2. Open a Notebook
3. Run in a cell : from statistics import mean
4. See error: no auto-completion

Expected behavior

Context

• Operating System and version: Ubuntu 20.04.2 LTS
• Browser and version: Chrome Version 89.0.4389.90 (Official Build) (64-bit)
• JupyterLab version:

  jupyter core     : 4.7.1
  jupyter-notebook : 6.2.0
  qtconsole        : not installed
  ipython          : 7.20.0
  ipykernel        : 5.4.2
  jupyter client   : 6.1.11
  jupyter lab      : 3.0.5
  nbconvert        : 6.0.7
  ipywidgets       : 7.6.3
  nbformat         : 5.1.2
  traitlets        : 5.0.5

Required: installed server extensions

jupyter_lsp enabled
    - Validating jupyter_lsp...
      jupyter_lsp 1.1.4 OK
    jupyterlab enabled
    - Validating jupyterlab...
      jupyterlab 3.0.5 OK

Required: installed lab extensions

JupyterLab v3.0.5
/opt/conda/share/jupyter/labextensions
        @jupyter-widgets/jupyterlab-manager v3.0.0 enabled OK (python, jupyterlab_widgets)
        @krassowski/jupyterlab-lsp v3.5.0 enabled OK (python, jupyterlab_lsp)

Troubleshoot Output

Paste the output from running `jupyter troubleshoot` from the command line here.
You may want to sanitize the paths in the output.

pip list:
    Package                       Version
    ----------------------------- -------------------
    alembic                       1.5.4
    anyio                         2.1.0
    argon2-cffi                   20.1.0
    astroid                       2.5.1
    async-generator               1.10
    attrs                         20.3.0
    autopep8                      1.5.5
    Babel                         2.9.0
    backcall                      0.2.0
    backports.functools-lru-cache 1.6.1
    bleach                        3.3.0
    blinker                       1.4
    brotlipy                      0.7.0
    cachetools                    4.2.1
    certifi                       2020.12.5
    certipy                       0.1.3
    cffi                          1.14.4
    chardet                       4.0.0
    conda                         4.9.2
    conda-package-handling        1.7.2
    configparser                  5.0.2
    cryptography                  3.3.1
    cycler                        0.10.0
    datalab                       1.2.0
    decorator                     4.4.2
    defusedxml                    0.6.0
    docstring-to-markdown         0.7
    entrypoints                   0.3
    flake8                        3.8.4
    future                        0.18.2
    google-api-core               1.26.1
    google-api-python-client      2.0.2
    google-auth                   1.28.0
    google-auth-httplib2          0.1.0
    google-cloud-bigquery         1.28.0
    google-cloud-bigquery-storage 1.1.0
    google-cloud-core             1.6.0
    google-cloud-monitoring       0.31.1
    google-crc32c                 1.1.2
    google-resumable-media        1.2.0
    googleapis-common-protos      1.53.0
    grpcio                        1.36.1
    httplib2                      0.19.0
    idna                          2.10
    imageio                       2.9.0
    importlib-metadata            3.4.0
    ipykernel                     5.4.2
    ipympl                        0.5.8
    ipython                       7.20.0
    ipython-genutils              0.2.0
    ipywidgets                    7.6.3
    isort                         5.8.0
    jedi                          0.17.2
    Jinja2                        2.11.3
    joblib                        1.0.1
    json5                         0.9.5
    jsonschema                    3.2.0
    jupyter-client                6.1.11
    jupyter-core                  4.7.1
    jupyter-lsp                   1.1.4
    jupyter-server                1.3.0
    jupyter-telemetry             0.1.0
    jupyterhub                    1.3.0
    jupyterlab                    3.0.5
    jupyterlab-lsp                3.5.0
    jupyterlab-pygments           0.1.2
    jupyterlab-server             2.2.0
    jupyterlab-widgets            1.0.0
    kiwisolver                    1.3.1
    lazy-object-proxy             1.6.0
    Mako                          1.1.4
    MarkupSafe                    1.1.1
    matplotlib                    3.3.4
    mccabe                        0.6.1
    mistune                       0.8.4
    mock                          4.0.3
    nbclassic                     0.2.6
    nbclient                      0.5.1
    nbconvert                     6.0.7
    nbformat                      5.1.2
    nest-asyncio                  1.4.3
    networkx                      2.5
    notebook                      6.2.0
    numpy                         1.20.1
    oauth2client                  4.1.3
    oauthlib                      3.0.1
    packaging                     20.9
    pamela                        1.0.0
    pandas                        0.25.3
    pandas-profiling              1.4.0
    pandocfilters                 1.4.2
    parso                         0.7.1
    pexpect                       4.8.0
    pickleshare                   0.7.5
    Pillow                        8.1.2
    pip                           21.0.1
    plotly                        4.14.3
    pluggy                        0.13.1
    prometheus-client             0.9.0
    prompt-toolkit                3.0.14
    protobuf                      3.15.6
    psutil                        5.8.0
    ptyprocess                    0.7.0
    pyarrow                       3.0.0
    pyasn1                        0.4.8
    pyasn1-modules                0.2.8
    pycodestyle                   2.6.0
    pycosat                       0.6.3
    pycparser                     2.20
    pycurl                        7.43.0.6
    pydocstyle                    6.0.0
    pyflakes                      2.2.0
    Pygments                      2.7.4
    PyJWT                         2.0.1
    pylint                        2.7.2
    pyOpenSSL                     20.0.1
    pyparsing                     2.4.7
    pyrsistent                    0.17.3
    PySocks                       1.7.1
    python-dateutil               2.8.1
    python-editor                 1.0.4
    python-json-logger            2.0.1
    python-jsonrpc-server         0.4.0
    python-language-server        0.36.2+49.g3536061
    pytz                          2021.1
    PyWavelets                    1.1.1
    PyYAML                        5.4.1
    pyzmq                         22.0.1
    requests                      2.25.1
    retrying                      1.3.3
    rope                          0.18.0
    rsa                           4.7.2
    ruamel-yaml-conda             0.15.80
    ruamel.yaml                   0.16.12
    ruamel.yaml.clib              0.2.2
    scikit-image                  0.18.1
    scikit-learn                  0.24.1
    scipy                         1.6.1
    seaborn                       0.11.1
    Send2Trash                    1.5.0
    setuptools                    49.6.0.post20210108
    six                           1.15.0
    sniffio                       1.2.0
    snowballstemmer               2.1.0
    SQLAlchemy                    1.3.23
    terminado                     0.9.2
    testpath                      0.4.4
    threadpoolctl                 2.1.0
    tifffile                      2021.3.17
    toml                          0.10.2
    tornado                       6.1
    tqdm                          4.56.0
    traitlets                     5.0.5
    ujson                         4.0.2
    uritemplate                   3.0.1
    urllib3                       1.26.3
    wcwidth                       0.2.5
    webencodings                  0.5.1
    wheel                         0.36.2
    widgetsnbextension            3.5.1
    wrapt                         1.12.1
    yapf                          0.31.0
    zipp                          3.4.0

conda list:
    # packages in environment at /opt/conda:
    #
    # Name                    Version                   Build  Channel
    _libgcc_mutex             0.1                 conda_forge    conda-forge
    _openmp_mutex             4.5                       1_gnu    conda-forge
    alembic                   1.5.4              pyhd8ed1ab_0    conda-forge
    anyio                     2.1.0            py38h578d9bd_0    conda-forge
    argon2-cffi               20.1.0           py38h497a2fe_2    conda-forge
    astroid                   2.5.1                    pypi_0    pypi
    async_generator           1.10                       py_0    conda-forge
    attrs                     20.3.0             pyhd3deb0d_0    conda-forge
    autopep8                  1.5.5                    pypi_0    pypi
    babel                     2.9.0              pyhd3deb0d_0    conda-forge
    backcall                  0.2.0              pyh9f0ad1d_0    conda-forge
    backports                 1.0                        py_2    conda-forge
    backports.functools_lru_cache 1.6.1                      py_0    conda-forge
    bleach                    3.3.0              pyh44b312d_0    conda-forge
    blinker                   1.4                        py_1    conda-forge
    brotlipy                  0.7.0           py38h497a2fe_1001    conda-forge
    bzip2                     1.0.8                h7f98852_4    conda-forge
    c-ares                    1.17.1               h36c2ea0_0    conda-forge
    ca-certificates           2020.12.5            ha878542_0    conda-forge
    cachetools                4.2.1                    pypi_0    pypi
    certifi                   2020.12.5        py38h578d9bd_1    conda-forge
    certipy                   0.1.3                      py_0    conda-forge
    cffi                      1.14.4           py38ha65f79e_1    conda-forge
    chardet                   4.0.0            py38h578d9bd_1    conda-forge
    conda                     4.9.2            py38h578d9bd_0    conda-forge
    conda-package-handling    1.7.2            py38h8df0ef7_0    conda-forge
    configparser              5.0.2                    pypi_0    pypi
    configurable-http-proxy   1.3.0                         0    conda-forge
    cryptography              3.3.1            py38h2b97feb_1    conda-forge
    cycler                    0.10.0                   pypi_0    pypi
    datalab                   1.2.0                    pypi_0    pypi
    decorator                 4.4.2                      py_0    conda-forge
    defusedxml                0.6.0                      py_0    conda-forge
    docstring-to-markdown     0.7                      pypi_0    pypi
    entrypoints               0.3             pyhd8ed1ab_1003    conda-forge
    flake8                    3.8.4                    pypi_0    pypi
    future                    0.18.2                   pypi_0    pypi
    google-api-core           1.26.1                   pypi_0    pypi
    google-api-python-client  2.0.2                    pypi_0    pypi
    google-auth               1.28.0                   pypi_0    pypi
    google-auth-httplib2      0.1.0                    pypi_0    pypi
    google-cloud-bigquery     1.28.0                   pypi_0    pypi
    google-cloud-bigquery-storage 1.1.0                    pypi_0    pypi
    google-cloud-core         1.6.0                    pypi_0    pypi
    google-cloud-monitoring   0.31.1                   pypi_0    pypi
    google-crc32c             1.1.2                    pypi_0    pypi
    google-resumable-media    1.2.0                    pypi_0    pypi
    googleapis-common-protos  1.53.0                   pypi_0    pypi
    grpcio                    1.36.1                   pypi_0    pypi
    httplib2                  0.19.0                   pypi_0    pypi
    icu                       68.1                 h58526e2_0    conda-forge
    idna                      2.10               pyh9f0ad1d_0    conda-forge
    imageio                   2.9.0                    pypi_0    pypi
    importlib-metadata        3.4.0            py38h578d9bd_0    conda-forge
    importlib_metadata        3.4.0                hd8ed1ab_0    conda-forge
    ipykernel                 5.4.2            py38h81c977d_0    conda-forge
    ipympl                    0.5.8                    pypi_0    pypi
    ipython                   7.20.0           py38h81c977d_2    conda-forge
    ipython_genutils          0.2.0                      py_1    conda-forge
    ipywidgets                7.6.3                    pypi_0    pypi
    isort                     5.8.0                    pypi_0    pypi
    jedi                      0.17.2                   pypi_0    pypi
    jinja2                    2.11.3             pyh44b312d_0    conda-forge
    joblib                    1.0.1                    pypi_0    pypi
    json5                     0.9.5              pyh9f0ad1d_0    conda-forge
    jsonschema                3.2.0                      py_2    conda-forge
    jupyter-lsp               1.1.4                    pypi_0    pypi
    jupyter_client            6.1.11             pyhd8ed1ab_1    conda-forge
    jupyter_core              4.7.1            py38h578d9bd_0    conda-forge
    jupyter_server            1.3.0            py38h578d9bd_0    conda-forge
    jupyter_telemetry         0.1.0              pyhd8ed1ab_1    conda-forge
    jupyterhub                1.3.0            py38h578d9bd_0    conda-forge
    jupyterhub-base           1.3.0            py38h578d9bd_0    conda-forge
    jupyterlab                3.0.5              pyhd8ed1ab_0    conda-forge
    jupyterlab-lsp            3.5.0                    pypi_0    pypi
    jupyterlab-widgets        1.0.0                    pypi_0    pypi
    jupyterlab_pygments       0.1.2              pyh9f0ad1d_0    conda-forge
    jupyterlab_server         2.2.0              pyhd8ed1ab_0    conda-forge
    kiwisolver                1.3.1                    pypi_0    pypi
    krb5                      1.17.2               h926e7f8_0    conda-forge
    lazy-object-proxy         1.6.0                    pypi_0    pypi
    ld_impl_linux-64          2.35.1               hea4e1c9_2    conda-forge
    libcurl                   7.71.1               hcdd3856_8    conda-forge
    libedit                   3.1.20191231         he28a2e2_2    conda-forge
    libev                     4.33                 h516909a_1    conda-forge
    libffi                    3.3                  h58526e2_2    conda-forge
    libgcc-ng                 9.3.0               h2828fa1_18    conda-forge
    libgomp                   9.3.0               h2828fa1_18    conda-forge
    libnghttp2                1.43.0               h812cca2_0    conda-forge
    libsodium                 1.0.18               h36c2ea0_1    conda-forge
    libssh2                   1.9.0                hab1572f_5    conda-forge
    libstdcxx-ng              9.3.0               h6de172a_18    conda-forge
    libuv                     1.40.0               h7f98852_0    conda-forge
    mako                      1.1.4              pyh44b312d_0    conda-forge
    markupsafe                1.1.1            py38h497a2fe_3    conda-forge
    matplotlib                3.3.4                    pypi_0    pypi
    mccabe                    0.6.1                    pypi_0    pypi
    mistune                   0.8.4           py38h497a2fe_1003    conda-forge
    mock                      4.0.3                    pypi_0    pypi
    nbclassic                 0.2.6              pyhd8ed1ab_0    conda-forge
    nbclient                  0.5.1                      py_0    conda-forge
    nbconvert                 6.0.7            py38h578d9bd_3    conda-forge
    nbformat                  5.1.2              pyhd8ed1ab_1    conda-forge
    ncurses                   6.2                  h58526e2_4    conda-forge
    nest-asyncio              1.4.3              pyhd8ed1ab_0    conda-forge
    networkx                  2.5                      pypi_0    pypi
    nodejs                    15.3.0               h92b4a50_1    conda-forge
    notebook                  6.2.0            py38h578d9bd_0    conda-forge
    numpy                     1.20.1                   pypi_0    pypi
    oauth2client              4.1.3                    pypi_0    pypi
    oauthlib                  3.0.1                      py_0    conda-forge
    openssl                   1.1.1i               h7f98852_0    conda-forge
    packaging                 20.9               pyh44b312d_0    conda-forge
    pamela                    1.0.0                      py_0    conda-forge
    pandas                    0.25.3                   pypi_0    pypi
    pandas-profiling          1.4.0                    pypi_0    pypi
    pandoc                    2.11.4               h7f98852_0    conda-forge
    pandocfilters             1.4.2                      py_1    conda-forge
    parso                     0.7.1                    pypi_0    pypi
    pexpect                   4.8.0              pyh9f0ad1d_2    conda-forge
    pickleshare               0.7.5                   py_1003    conda-forge
    pillow                    8.1.2                    pypi_0    pypi
    pip                       21.0.1             pyhd8ed1ab_0    conda-forge
    plotly                    4.14.3                   pypi_0    pypi
    pluggy                    0.13.1                   pypi_0    pypi
    prometheus_client         0.9.0              pyhd3deb0d_0    conda-forge
    prompt-toolkit            3.0.14             pyha770c72_0    conda-forge
    protobuf                  3.15.6                   pypi_0    pypi
    psutil                    5.8.0                    pypi_0    pypi
    ptyprocess                0.7.0              pyhd3deb0d_0    conda-forge
    pyarrow                   3.0.0                    pypi_0    pypi
    pyasn1                    0.4.8                    pypi_0    pypi
    pyasn1-modules            0.2.8                    pypi_0    pypi
    pycodestyle               2.6.0                    pypi_0    pypi
    pycosat                   0.6.3           py38h497a2fe_1006    conda-forge
    pycparser                 2.20               pyh9f0ad1d_2    conda-forge
    pycurl                    7.43.0.6         py38h996a351_1    conda-forge
    pydocstyle                6.0.0                    pypi_0    pypi
    pyflakes                  2.2.0                    pypi_0    pypi
    pygments                  2.7.4              pyhd8ed1ab_0    conda-forge
    pyjwt                     2.0.1              pyhd8ed1ab_0    conda-forge
    pylint                    2.7.2                    pypi_0    pypi
    pyopenssl                 20.0.1             pyhd8ed1ab_0    conda-forge
    pyparsing                 2.4.7              pyh9f0ad1d_0    conda-forge
    pyrsistent                0.17.3           py38h497a2fe_2    conda-forge
    pysocks                   1.7.1            py38h578d9bd_3    conda-forge
    python                    3.8.6           hffdb5ce_4_cpython    conda-forge
    python-dateutil           2.8.1                      py_0    conda-forge
    python-editor             1.0.4                      py_0    conda-forge
    python-json-logger        2.0.1              pyh9f0ad1d_0    conda-forge
    python-jsonrpc-server     0.4.0                    pypi_0    pypi
    python-language-server    0.36.2+49.g3536061          pypi_0    pypi
    python_abi                3.8                      1_cp38    conda-forge
    pytz                      2021.1             pyhd8ed1ab_0    conda-forge
    pywavelets                1.1.1                    pypi_0    pypi
    pyyaml                    5.4.1                    pypi_0    pypi
    pyzmq                     22.0.1           py38h3d7ac18_0    conda-forge
    readline                  8.0                  he28a2e2_2    conda-forge
    requests                  2.25.1             pyhd3deb0d_0    conda-forge
    retrying                  1.3.3                    pypi_0    pypi
    rope                      0.18.0                   pypi_0    pypi
    rsa                       4.7.2                    pypi_0    pypi
    ruamel.yaml               0.16.12          py38h497a2fe_2    conda-forge
    ruamel.yaml.clib          0.2.2            py38h497a2fe_2    conda-forge
    ruamel_yaml               0.15.80         py38h497a2fe_1004    conda-forge
    scikit-image              0.18.1                   pypi_0    pypi
    scikit-learn              0.24.1                   pypi_0    pypi
    scipy                     1.6.1                    pypi_0    pypi
    seaborn                   0.11.1                   pypi_0    pypi
    send2trash                1.5.0                      py_0    conda-forge
    setuptools                49.6.0           py38h578d9bd_3    conda-forge
    six                       1.15.0             pyh9f0ad1d_0    conda-forge
    sniffio                   1.2.0            py38h578d9bd_1    conda-forge
    snowballstemmer           2.1.0                    pypi_0    pypi
    sqlalchemy                1.3.23           py38h497a2fe_0    conda-forge
    sqlite                    3.34.0               h74cdb3f_0    conda-forge
    terminado                 0.9.2            py38h578d9bd_0    conda-forge
    testpath                  0.4.4                      py_0    conda-forge
    threadpoolctl             2.1.0                    pypi_0    pypi
    tifffile                  2021.3.17                pypi_0    pypi
    tini                      0.18.0            h14c3975_1001    conda-forge
    tk                        8.6.10               h21135ba_1    conda-forge
    toml                      0.10.2                   pypi_0    pypi
    tornado                   6.1              py38h497a2fe_1    conda-forge
    tqdm                      4.56.0             pyhd8ed1ab_0    conda-forge
    traitlets                 5.0.5                      py_0    conda-forge
    ujson                     4.0.2                    pypi_0    pypi
    uritemplate               3.0.1                    pypi_0    pypi
    urllib3                   1.26.3             pyhd8ed1ab_0    conda-forge
    wcwidth                   0.2.5              pyh9f0ad1d_2    conda-forge
    webencodings              0.5.1                      py_1    conda-forge
    wheel                     0.36.2             pyhd3deb0d_0    conda-forge
    widgetsnbextension        3.5.1                    pypi_0    pypi
    wrapt                     1.12.1                   pypi_0    pypi
    xz                        5.2.5                h516909a_1    conda-forge
    yaml                      0.2.5                h516909a_0    conda-forge
    yapf                      0.31.0                   pypi_0    pypi
    zeromq                    4.3.4                h9c3ff4c_0    conda-forge
    zipp                      3.4.0                      py_0    conda-forge
    zlib                      1.2.11            h516909a_1010    conda-forge

Command Line Output

Paste the output from your command line running `jupyter lab` here, use `--debug` if possible.

Browser Output (recommended for all interface issues)

Paste the output from your browser JavaScript console replacing the text in here.

To learn how to open the developer tools in your browser:
https://developer.mozilla.org/en-US/docs/Learn/Common_questions/What_are_browser_developer_tools#How_to_open_the_devtools_in_your_browser
If too many messages accumulated after many hours of working in JupyterLab,
consider refreshing the window and then reproducing the bug to reduce the noise in the logs.

Thank you for your help !

[krassowski]

Looking at the 4. See error: no auto-completion, I do not see an error there. It looks like the completion is slow (this, is slower than you type), but it does work and the slowness is not because of this extension (jupyterlab-lsp) but of the particular language server that you chosen to use (pyls).

That server (pyls) is known to be slow at completion because of how the jedi evolved (and it did not, and how the company that created it initially apparently abandoned it). There are many other servers for Python out there, including jedi-language-server, pylance, and my fork of pyls, that as I see you already tried and are satisfied with. I do not know how else I could help here.

To re-iterate, yes there is a known problem with the performance of completion in pyls, but I am not a creator of it, nor a maintainer and this is not the right repository for it. Yes, I did manage to fix the performance on my fork and we (with Spyder folks) recently tried to revive the development of pyls and will release a better, derivative server, but under a different name.

As for the other features that you mention (jump to definition and rename), I would really need a reproducible example, ideally with the output of the developer console from your browser after attempting these actions.

[krassowski]

The only way to make it works was to install pip install git+https://github.com/krassowski/python-language-server.git@main, but the documentation doesn't recommend to use it in production environnement.

To clarify, I would not recommend anyone to build a product around it, or ship to JupyterHub deployment with hundreds of users, but if this is just for your own use (or use by a small team), I would not worry about it too much. Just mentioning because I know how many different things people can understand by "production".

[julioyildo]

@krassowski thank you very much for your answers.

That server (pyls) is known to be slow at completion because of how the jedi evolved (and it did not, and how the company that created it initially apparently abandoned it). There are many other servers for Python out there, including jedi-language-server, pylance, and my fork of pyls, that as I see you already tried and are satisfied with. I do not know how else I could help here.

Okay, I would like to test with jedi-language-server. Do I just have to just uninstall python-language-server and then install pip install -U jedi-language-server ? :)

---

To clarify, I would not recommend anyone to build a product around it, or ship to JupyterHub deployment with hundreds of users, but if this is just for your own use (or use by a small team), I would not worry about it too much. Just mentioning because I know how many different things people can understand by "production".

Okay, I understand! Actually, we just want to use it in our Data Science team ( 10 to 15 users). :)

[krassowski]

Do I just have to just uninstall python-language-server and then install pip install -U jedi-language-server ? :)

Basically yes. However you will also need to upgrade IPython to 7.20 if using jedi-language-server 0.22+. Or you could just install 0.21.

[riderx]

@krassowski i did uninstall python-language-server and switch to jedi-language-server but it was way less features no ? i don't see completion with params in the functions anymore, and no flake-8 plugin, do you think we can mix both ?

[krassowski]

Yes, jedi-language-server implements fewer features. We do plan to allow mixing multiple servers and I did some work towards it recently, but a lot more work is needed. jedi-language-server provides some diagnostics but only for some syntax errors, and indeed no support for flake8, see: https://github.com/pappasam/jedi-language-server#language-features

[julioyildo]

Thank you @krassowski for your answers. I am closing this issue.