Re: guix import error + New: setting up a jupyterlab environment

[Zelphir Kaltstahl <zelphirkaltstahl@posteo.de>]

Hello Efraim,

Thanks for your patience! It seems with that I am getting quite far (at
least it feels like making progress, or even being close to have a
working environment), up to the "check phase". There some tests failing
in the "check phase". Here is what I am getting now, regardless of
whether I stick ("python-ipykernel" ,python-ipykernel) in the native
inputs or propagated inputs:

~~~~START~~~~
running install_egg_info
Copying jupyterlab_server.egg-info to /gnu/store/2h44ldpcqqd0q7hqpbcqdavcnbjsibfb-python-jupyterlab-server-1.2.0/lib/python3.8/site-packages/jupyterlab_server-1.2.0-py3.8.egg-info
running install_scripts
phase `install' succeeded after 0.3 seconds
starting phase `wrap'
find-files: /gnu/store/2h44ldpcqqd0q7hqpbcqdavcnbjsibfb-python-jupyterlab-server-1.2.0/bin: No such file or directory
find-files: /gnu/store/2h44ldpcqqd0q7hqpbcqdavcnbjsibfb-python-jupyterlab-server-1.2.0/sbin: No such file or directory
phase `wrap' succeeded after 0.0 seconds
starting phase `check'
running "python setup.py" with command "test" and parameters ()
running test
running egg_info
writing jupyterlab_server.egg-info/PKG-INFO
writing dependency_links to jupyterlab_server.egg-info/dependency_links.txt
writing requirements to jupyterlab_server.egg-info/requires.txt
writing top-level names to jupyterlab_server.egg-info/top_level.txt
reading manifest file 'jupyterlab_server.egg-info/SOURCES.txt'
reading manifest template 'MANIFEST.in'
warning: no previously-included files matching '*~' found anywhere in distribution
warning: no previously-included files matching '*.pyc' found anywhere in distribution
warning: no previously-included files matching '*.pyo' found anywhere in distribution
warning: no previously-included files matching '.git' found anywhere in distribution
warning: no previously-included files matching '.ipynb_checkpoints' found anywhere in distribution
writing manifest file 'jupyterlab_server.egg-info/SOURCES.txt'
running build_ext
test_get (jupyterlab_server.tests.test_settings_api.SettingsAPITest) ... ERROR
test_get_bad (jupyterlab_server.tests.test_settings_api.SettingsAPITest) ... ERROR
test_listing (jupyterlab_server.tests.test_settings_api.SettingsAPITest) ... ERROR
test_patch (jupyterlab_server.tests.test_settings_api.SettingsAPITest) ... ERROR
test_patch_bad_data (jupyterlab_server.tests.test_settings_api.SettingsAPITest) ... ERROR
test_patch_wrong_id (jupyterlab_server.tests.test_settings_api.SettingsAPITest) ... ERROR
test_bad_put (jupyterlab_server.tests.test_workspaces_api.WorkspacesAPITest) ... ERROR
test_blank_put (jupyterlab_server.tests.test_workspaces_api.WorkspacesAPITest) ... ERROR
test_delete (jupyterlab_server.tests.test_workspaces_api.WorkspacesAPITest) ... ERROR
test_get (jupyterlab_server.tests.test_workspaces_api.WorkspacesAPITest) ... ERROR
test_listing (jupyterlab_server.tests.test_workspaces_api.WorkspacesAPITest) ... ERROR
test_put (jupyterlab_server.tests.test_workspaces_api.WorkspacesAPITest) ... ERROR

======================================================================
ERROR: test_get (jupyterlab_server.tests.test_settings_api.SettingsAPITest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/tmp/guix-build-python-jupyterlab-server-1.2.0.drv-0/jupyterlab_server-1.2.0/jupyterlab_server/tests/test_settings_api.py", line 31, in setUp
    dst = os.path.join(self.lab_config.schemas_dir, '@jupyterlab')
AttributeError: 'SettingsAPITest' object has no attribute 'lab_config'

======================================================================
ERROR: test_get_bad (jupyterlab_server.tests.test_settings_api.SettingsAPITest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/tmp/guix-build-python-jupyterlab-server-1.2.0.drv-0/jupyterlab_server-1.2.0/jupyterlab_server/tests/test_settings_api.py", line 31, in setUp
    dst = os.path.join(self.lab_config.schemas_dir, '@jupyterlab')
AttributeError: 'SettingsAPITest' object has no attribute 'lab_config'

======================================================================
ERROR: test_listing (jupyterlab_server.tests.test_settings_api.SettingsAPITest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/tmp/guix-build-python-jupyterlab-server-1.2.0.drv-0/jupyterlab_server-1.2.0/jupyterlab_server/tests/test_settings_api.py", line 31, in setUp
    dst = os.path.join(self.lab_config.schemas_dir, '@jupyterlab')
AttributeError: 'SettingsAPITest' object has no attribute 'lab_config'

======================================================================
ERROR: test_patch (jupyterlab_server.tests.test_settings_api.SettingsAPITest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/tmp/guix-build-python-jupyterlab-server-1.2.0.drv-0/jupyterlab_server-1.2.0/jupyterlab_server/tests/test_settings_api.py", line 31, in setUp
    dst = os.path.join(self.lab_config.schemas_dir, '@jupyterlab')
AttributeError: 'SettingsAPITest' object has no attribute 'lab_config'

======================================================================
ERROR: test_patch_bad_data (jupyterlab_server.tests.test_settings_api.SettingsAPITest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/tmp/guix-build-python-jupyterlab-server-1.2.0.drv-0/jupyterlab_server-1.2.0/jupyterlab_server/tests/test_settings_api.py", line 31, in setUp
    dst = os.path.join(self.lab_config.schemas_dir, '@jupyterlab')
AttributeError: 'SettingsAPITest' object has no attribute 'lab_config'

======================================================================
ERROR: test_patch_wrong_id (jupyterlab_server.tests.test_settings_api.SettingsAPITest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/tmp/guix-build-python-jupyterlab-server-1.2.0.drv-0/jupyterlab_server-1.2.0/jupyterlab_server/tests/test_settings_api.py", line 31, in setUp
    dst = os.path.join(self.lab_config.schemas_dir, '@jupyterlab')
AttributeError: 'SettingsAPITest' object has no attribute 'lab_config'

======================================================================
ERROR: test_bad_put (jupyterlab_server.tests.test_workspaces_api.WorkspacesAPITest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/tmp/guix-build-python-jupyterlab-server-1.2.0.drv-0/jupyterlab_server-1.2.0/jupyterlab_server/tests/test_workspaces_api.py", line 34, in setUp
    dst = os.path.join(self.lab_config.workspaces_dir, item)
AttributeError: 'WorkspacesAPITest' object has no attribute 'lab_config'

======================================================================
ERROR: test_blank_put (jupyterlab_server.tests.test_workspaces_api.WorkspacesAPITest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/tmp/guix-build-python-jupyterlab-server-1.2.0.drv-0/jupyterlab_server-1.2.0/jupyterlab_server/tests/test_workspaces_api.py", line 34, in setUp
    dst = os.path.join(self.lab_config.workspaces_dir, item)
AttributeError: 'WorkspacesAPITest' object has no attribute 'lab_config'

======================================================================
ERROR: test_delete (jupyterlab_server.tests.test_workspaces_api.WorkspacesAPITest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/tmp/guix-build-python-jupyterlab-server-1.2.0.drv-0/jupyterlab_server-1.2.0/jupyterlab_server/tests/test_workspaces_api.py", line 34, in setUp
    dst = os.path.join(self.lab_config.workspaces_dir, item)
AttributeError: 'WorkspacesAPITest' object has no attribute 'lab_config'

======================================================================
ERROR: test_get (jupyterlab_server.tests.test_workspaces_api.WorkspacesAPITest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/tmp/guix-build-python-jupyterlab-server-1.2.0.drv-0/jupyterlab_server-1.2.0/jupyterlab_server/tests/test_workspaces_api.py", line 34, in setUp
    dst = os.path.join(self.lab_config.workspaces_dir, item)
AttributeError: 'WorkspacesAPITest' object has no attribute 'lab_config'

======================================================================
ERROR: test_listing (jupyterlab_server.tests.test_workspaces_api.WorkspacesAPITest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/tmp/guix-build-python-jupyterlab-server-1.2.0.drv-0/jupyterlab_server-1.2.0/jupyterlab_server/tests/test_workspaces_api.py", line 34, in setUp
    dst = os.path.join(self.lab_config.workspaces_dir, item)
AttributeError: 'WorkspacesAPITest' object has no attribute 'lab_config'

======================================================================
ERROR: test_put (jupyterlab_server.tests.test_workspaces_api.WorkspacesAPITest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/tmp/guix-build-python-jupyterlab-server-1.2.0.drv-0/jupyterlab_server-1.2.0/jupyterlab_server/tests/test_workspaces_api.py", line 34, in setUp
    dst = os.path.join(self.lab_config.workspaces_dir, item)
AttributeError: 'WorkspacesAPITest' object has no attribute 'lab_config'

----------------------------------------------------------------------
Ran 12 tests in 0.001s

FAILED (errors=12)
Test failed: <unittest.runner.TextTestResult run=12 errors=12 failures=0>
error: Test failed: <unittest.runner.TextTestResult run=12 errors=12 failures=0>
command "python" "-c" "import setuptools, tokenize;__file__='setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\\r\\n', '\\n');f.close();exec(compile(code, __file__, 'exec'))" "test" failed with status 1
~~~~~END~~~~~

I have some thoughts about this:

The Python error does not really tell me what is wrong. I don't know why
the `WorkspacesAPITest` does not have an attribute named `lab_config`.

One can see, that those are all API tests. Since there were problems in
the previous step with network, perhaps it is a network thing here as
well? (Is network, even if localhost for testing, available in the
"check phase"?)

It could also simply be, that some PyPI package has failing tests. I
don't know how one could then skip such tests.

I guess I will summarize everything in the end and put it in a
repository as a kind of "guide", so that others can use it or learn from
the process.

Regards,
Zelphir

On 10/19/20 6:54 PM, Efraim Flashner wrote:
> It looks like you need to add python-ipykernel to native-inputs.
> Unless it's needed to run the program and not just for the test suite,
> in which case it should go in propagated-inputs. There's no network
> available in the build environment so it can't retrieve ipykernel
> while building.
>
>
> On October 19, 2020 2:31:53 PM UTC, Zelphir Kaltstahl
> <zelphirkaltstahl@posteo.de> wrote:
>
>     Hello Efraim!
>
>     Thank you! Your idea of replacing "-" with "_" seems to partially
>     help:
>
>     The package is downloaded and byte compiled. However, afterwards
>     there is a problem, when it tries to copy the byte-compiled files
>     in the "wrap phase" (comments inserted in some places):
>
>     ~~~~START~~~~
>     ### ... a lot of output before this ...
>
>     byte-compiling /gnu/store/yr7q21bws1xgx3p2dy9cfdiknjpsajm6-python-jupyterlab-server-1.2.0/lib/python3.8/site-packages/jupyterlab_server/__init__.py to __init__.cpython-38.pyc
>     byte-compiling /gnu/store/yr7q21bws1xgx3p2dy9cfdiknjpsajm6-python-jupyterlab-server-1.2.0/lib/python3.8/site-packages/jupyterlab_server/_version.py to _version.cpython-38.pyc
>     byte-compiling /gnu/store/yr7q21bws1xgx3p2dy9cfdiknjpsajm6-python-jupyterlab-server-1.2.0/lib/python3.8/site-packages/jupyterlab_server/app.py to app.cpython-38.pyc
>     byte-compiling /gnu/store/yr7q21bws1xgx3p2dy9cfdiknjpsajm6-python-jupyterlab-server-1.2.0/lib/python3.8/site-packages/jupyterlab_server/handlers.py to handlers.cpython-38.pyc
>     byte-compiling /gnu/store/yr7q21bws1xgx3p2dy9cfdiknjpsajm6-python-jupyterlab-server-1.2.0/lib/python3.8/site-packages/jupyterlab_server/listings_handler.py to listings_handler.cpython-38.pyc
>     byte-compiling /gnu/store/yr7q21bws1xgx3p2dy9cfdiknjpsajm6-python-jupyterlab-server-1.2.0/lib/python3.8/site-packages/jupyterlab_server/process.py to process.cpython-38.pyc
>     byte-compiling /gnu/store/yr7q21bws1xgx3p2dy9cfdiknjpsajm6-python-jupyterlab-server-1.2.0/lib/python3.8/site-packages/jupyterlab_server/process_app.py to process_app.cpython-38.pyc
>     byte-compiling /gnu/store/yr7q21bws1xgx3p2dy9cfdiknjpsajm6-python-jupyterlab-server-1.2.0/lib/python3.8/site-packages/jupyterlab_server/server.py to server.cpython-38.pyc
>     byte-compiling /gnu/store/yr7q21bws1xgx3p2dy9cfdiknjpsajm6-python-jupyterlab-server-1.2.0/lib/python3.8/site-packages/jupyterlab_server/servertest.py to servertest.cpython-38.pyc
>     byte-compiling /gnu/store/yr7q21bws1xgx3p2dy9cfdiknjpsajm6-python-jupyterlab-server-1.2.0/lib/python3.8/site-packages/jupyterlab_server/settings_handler.py to settings_handler.cpython-38.pyc
>     byte-compiling /gnu/store/yr7q21bws1xgx3p2dy9cfdiknjpsajm6-python-jupyterlab-server-1.2.0/lib/python3.8/site-packages/jupyterlab_server/themes_handler.py to themes_handler.cpython-38.pyc
>     byte-compiling /gnu/store/yr7q21bws1xgx3p2dy9cfdiknjpsajm6-python-jupyterlab-server-1.2.0/lib/python3.8/site-packages/jupyterlab_server/workspaces_handler.py to workspaces_handler.cpython-38.pyc
>     byte-compiling /gnu/store/yr7q21bws1xgx3p2dy9cfdiknjpsajm6-python-jupyterlab-server-1.2.0/lib/python3.8/site-packages/jupyterlab_server/tests/__init__.py to __init__.cpython-38.pyc
>     byte-compiling /gnu/store/yr7q21bws1xgx3p2dy9cfdiknjpsajm6-python-jupyterlab-server-1.2.0/lib/python3.8/site-packages/jupyterlab_server/tests/test_settings_api.py to test_settings_api.cpython-38.pyc
>     byte-compiling /gnu/store/yr7q21bws1xgx3p2dy9cfdiknjpsajm6-python-jupyterlab-server-1.2.0/lib/python3.8/site-packages/jupyterlab_server/tests/test_workspaces_api.py to test_workspaces_api.cpython-38.pyc
>     byte-compiling /gnu/store/yr7q21bws1xgx3p2dy9cfdiknjpsajm6-python-jupyterlab-server-1.2.0/lib/python3.8/site-packages/jupyterlab_server/tests/utils.py to utils.cpython-38.pyc
>
>     ### ... seems byte-compiling went without problems, but not comes the problem ...
>
>     running install_egg_info
>     Copying jupyterlab_server.egg-info to /gnu/store/yr7q21bws1xgx3p2dy9cfdiknjpsajm6-python-jupyterlab-server-1.2.0/lib/python3.8/site-packages/jupyterlab_server-1.2.0-py3.8.egg-info
>     running install_scripts
>     phase `install' succeeded after 0.3 seconds
>     starting phase `wrap'
>     find-files: /gnu/store/yr7q21bws1xgx3p2dy9cfdiknjpsajm6-python-jupyterlab-server-1.2.0/bin: No such file or directory
>     find-files: /gnu/store/yr7q21bws1xgx3p2dy9cfdiknjpsajm6-python-jupyterlab-server-1.2.0/sbin: No such file or directory
>     phase `wrap' succeeded after 0.0 seconds
>     starting phase `check'
>     running "python setup.py" with command "test" and parameters ()
>     running test
>     Searching for ipykernel
>     Reading https://pypi.org/simple/ipykernel/
>     Download error on https://pypi.org/simple/ipykernel/: [Errno -2] Name or service not known -- Some packages may not be found!
>     Couldn't find index page for 'ipykernel' (maybe misspelled?)
>     Scanning index of all packages (this may take a while)
>     Reading https://pypi.org/simple/
>     Download error on https://pypi.org/simple/: [Errno -2] Name or service not known -- Some packages may not be found!
>     No local packages or working download links found for ipykernel
>     error: Could not find suitable distribution for Requirement.parse('ipykernel')
>     command "python" "-c" "import setuptools, tokenize;__file__='setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\\r\\n', '\\n');f.close();exec(compile(code, __file__, 'exec'))" "test" failed with status 1
>     ~~~~~END~~~~~
>
>     So it seems, that while the download URL is corrected, there is
>     another place, where Guix has an error now, resulting in a final
>     error shown in command line:
>
>     ~~~~START~~~~
>     $ guix time-machine --channels=channels.scm -- environment --manifest=manifest.scm --load=jupyterlab.scm
>     Updating channel 'guix' from Git repository at 'https://git.savannah.gnu.org/git/guix.git'...
>     substitute: updating substitutes from 'https://ci.guix.gnu.org'... 100.0%
>     The following derivations will be built:
>        /gnu/store/wzmfn9m45bmsbrx094rv3lf3w0rpmw49-python-pytest-check-links-0.3.0.drv
>        /gnu/store/96xf5mrg134mcsp01b0m1qs1lxkb401a-python-jupyterlab-server-1.2.0.drv
>        /gnu/store/32a28hd7aainwn0hfsnf3blh8prmfz61-jupyterlab_server-1.2.0.tar.gz.drv
>
>     3,9 MB will be downloaded
>     downloading from https://ci.guix.gnu.org/nar/lzip/54kpl9psx16jwic4gpnjwh44kim04wlk-python-notebook-5.7.4 ...
>      python-notebook-5.7.4  3.7MiB                                                                                                                                                                                                        5.1MiB/s 00:01 [##################] 100.0%
>
>     building /gnu/store/32a28hd7aainwn0hfsnf3blh8prmfz61-jupyterlab_server-1.2.0.tar.gz.drv...
>     downloading from https://files.pythonhosted.org/packages/source/j/jupyterlab_server/jupyterlab_server-1.2.0.tar.gz ...
>     building /gnu/store/wzmfn9m45bmsbrx094rv3lf3w0rpmw49-python-pytest-check-links-0.3.0.drv...
>     building /gnu/store/96xf5mrg134mcsp01b0m1qs1lxkb401a-python-jupyterlab-server-1.2.0.drv...
>     \ 'check' phasebuilder for `/gnu/store/96xf5mrg134mcsp01b0m1qs1lxkb401a-python-jupyterlab-server-1.2.0.drv' failed with exit code 1
>     build of /gnu/store/96xf5mrg134mcsp01b0m1qs1lxkb401a-python-jupyterlab-server-1.2.0.drv failed
>     View build log at '/var/log/guix/drvs/96/xf5mrg134mcsp01b0m1qs1lxkb401a-python-jupyterlab-server-1.2.0.drv.bz2'.
>     guix environment: error: build of `/gnu/store/96xf5mrg134mcsp01b0m1qs1lxkb401a-python-jupyterlab-server-1.2.0.drv' failed
>     ~~~~~END~~~~~
>
>     Apparently ipykernel is not found, but when I visit
>     https://pypi.org/simple/ipykernel/, I see packages there.
>
>     From the logs:
>
>     ~~~~START~~~~
>     Download error on https://pypi.org/simple/ipykernel/: [Errno -2] Name or service not known -- Some packages may not be found!
>     Couldn't find index page for 'ipykernel' (maybe misspelled?)
>     ~~~~~END~~~~~
>
>     Do I need to add another input in my `jupyterlab.scm`? (How?) Or
>     perhaps I need to create a separate `ipykernel.scm` which contains
>     the output of `guix import pypi --recursive ipykernel`?
>
>     However, it somehow seems to fail for PyPI simple in general (from
>     the logs again):
>
>     ~~~~START~~~~
>     Reading https://pypi.org/simple/
>     Download error on https://pypi.org/simple/: [Errno -2] Name or service not known -- Some packages may not be found!
>     No local packages or working download links found for ipykernel
>     error: Could not find suitable distribution for Requirement.parse('ipykernel')
>     command "python" "-c" "import setuptools, tokenize;__file__='setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\\r\\n', '\\n');f.close();exec(compile(code, __file__, 'exec'))" "test" failed with status 1
>     ~~~~~END~~~~~
>
>     Thanks,
>     Zelphir
>
>
>     On 10/18/20 6:35 PM, Efraim Flashner wrote:
>>     On Sun, Oct 18, 2020 at 01:55:49PM +0200, Zelphir Kaltstahl wrote:
>>>     Hello Guix Users, hello Zimoun and Tobias!
>>>
>>>     Thanks for your information regarding the importer syntax thing.
>>>
>>>     I continued trying to get a jupyterlab environment today.
>>>
>>>     Here is what I did so far:
>>>
>>>     (1) Create my manifest file:
>>>
>>>     ~~~~START~~~~
>>>     (specifications->manifest
>>>      '("python"))
>>>     ~~~~~END~~~~~
>>>
>>>     (2) Create my channels file:
>>>
>>>     ~~~~START~~~~
>>>     $ guix describe --format=channels > channels.scm
>>>     $ cat channels.scm
>>>     (list (channel
>>>             (name 'guix)
>>>             (url "https://git.savannah.gnu.org/git/guix.git")
>>>             (commit
>>>               "6ca673b30dac281ba27a8dac242c0ac83e5e354b")
>>>             (introduction
>>>               (make-channel-introduction
>>>                 "9edb3f66fd807b096b48283debdcddccfea34bad"
>>>                 (openpgp-fingerprint
>>>                   "BBB0 2DDF 2CEA F6A8 0D1D  E643 A2A0 6DF2 A33A 54FA")))))
>>>     ~~~~~END~~~~~
>>>
>>>     (3) Create my jupyterlab PyPI import file, this time around using the
>>>     "/" instead of "@" for specifying the version:
>>>
>>>     ~~~~START~~~~
>>>     $ guix import pypi --recursive jupyterlab/2.1.5 > jupyterlab.scm
>>>     ~~~~~END~~~~~
>>>
>>>     (4) Add missing import expressions and add output expression at the end:
>>>
>>>     ~~~~START~~~~
>>>     ;; add module imports
>>>     (use-modules
>>>      (guix packages)
>>>      (guix download)
>>>      (guix build-system python)
>>>      ((guix licenses) #:prefix license:)
>>>      ;; use `guix environment --ad-hoc python-jinja2 -- guix package -A python-jinja2` to find the location of python-jinja2, which is gnu/packages/python-xyz.scm
>>     This can be just 'guix package -A python-jinja2', no need for the
>>     environment.
>>
>>>      (gnu packages python-xyz)
>>>      ;; for python-tornado
>>>      (gnu packages python-web)
>>>      ;; for python-pytest
>>>      (gnu packages check))
>>>
>>>     ;; QUESTION: Why are those required packages not imported by guix automatically?
>>>     ;; QUESTION: Why are the manually imported packages not actually in files with their own name, but instead jinja2 -> python-xyz, tornado -> python-web, and pytest -> check?
>>>     ;; QUESTION: Is my process of finding the files in which the packages are correct or just working by chance?
>>>
>>>     (define-public python-jupyterlab-server
>>>       (package
>>>         (name "python-jupyterlab-server")
>>>         (version "1.2.0")
>>>         (source
>>>           (origin
>>>             (method url-fetch)
>>>             (uri (pypi-uri "jupyterlab-server" version))
>>>             (sha256
>>>               (base32
>>>                 "132xby7531rbrjg9bqvsx86birr1blynjxy8gi5kcnb6x7fxjcal"))))
>>>         (build-system python-build-system)
>>>         (propagated-inputs
>>>           `(("python-jinja2" ,python-jinja2)
>>>             ("python-json5" ,python-json5)
>>>             ("python-jsonschema" ,python-jsonschema)
>>>             ("python-notebook" ,python-notebook)
>>>             ("python-requests" ,python-requests)))
>>>         (native-inputs
>>>           `(("python-pytest" ,python-pytest)
>>>             ("python-requests" ,python-requests)))
>>>         (home-page "https://jupyter.org")
>>>         (synopsis "JupyterLab Server")
>>>         (description "JupyterLab Server")
>>>         (license license:bsd-3)))
>>>
>>>     (define-public python-jupyterlab
>>>       (package
>>>         (name "python-jupyterlab")
>>>         (version "2.1.5")
>>>         (source
>>>           (origin
>>>             (method url-fetch)
>>>             (uri (pypi-uri "jupyterlab" version))
>>>             (sha256
>>>               (base32
>>>                 "162jn51cg36fsn4l2zhnb5n4nbkhm9wlv974ggcnmdij3i4r4yya"))))
>>>         (build-system python-build-system)
>>>         (propagated-inputs
>>>           `(("python-jinja2" ,python-jinja2)
>>>             ("python-jupyterlab-server"
>>>              ,python-jupyterlab-server)
>>>             ("python-notebook" ,python-notebook)
>>>             ("python-tornado" ,python-tornado)))
>>>         (native-inputs
>>>           `(("python-pytest" ,python-pytest)
>>>             ("python-pytest-check-links"
>>>              ,python-pytest-check-links)
>>>             ("python-requests" ,python-requests)
>>>             ("python-virtualenv" ,python-virtualenv)
>>>             ("python-wheel" ,python-wheel)))
>>>         (home-page "http://jupyter.org")
>>>         (synopsis
>>>           "The JupyterLab notebook server extension.")
>>>         (description
>>>           "The JupyterLab notebook server extension.")
>>>         (license license:bsd-3)))
>>>
>>>     python-jupyterlab
>>>     ~~~~~END~~~~~
>>>
>>>     And as noted in the comments, I have 3 questions at this point:
>>>
>>>     (Q1) Why are those required packages not imported by guix automatically?
>>>     (My guess: This functionality simply has not yet been implemented.)
>>>
>>>     (Q2) Why are the manually imported packages not actually in files with
>>>     their own name, but instead jinja2 -> python-xyt, tornado -> python-web,
>>>     and pytest -> check? Why not (gnu packages python pytest) for example?
>>>
>>>     (Q3) Is my process of finding the files in which the packages are
>>>     correct or just working by chance? Basically I am creating temporary
>>>     environments, in which I then lookup "where would the package be
>>>     installed" and then exit the temporary environment to use that
>>>     information in my imported package file's import expressions /
>>>     use-modules expression. This seems to be a bit of a convoluted process,
>>>     though worth it, if it always works in the end.
>>>
>>>     (4) Now I run my time-machine command:
>>>
>>>     ~~~~START~~~~
>>>     $ guix time-machine --channels=channels.scm -- environment --manifest=manifest.scm --load=jupyterlab.scm
>>>     ~~~~~END~~~~~
>>>
>>>     This take a moment and then I get an error (the full output is longer,
>>>     but when running it multiple times, already successful steps are not all
>>>     done repeatedly, so the output is then reduced to what fails):
>>>
>>>     ~~~~START~~~~
>>>     $ guix time-machine --channels=channels.scm -- environment --manifest=manifest.scm --load=jupyterlab.scm
>>>     Updating channel 'guix' from Git repository at 'https://git.savannah.gnu.org/git/guix.git'...
>>>     The following derivations will be built:
>>>        /gnu/store/wzmfn9m45bmsbrx094rv3lf3w0rpmw49-python-pytest-check-links-0.3.0.drv
>>>        /gnu/store/n9i421lrbwrr8d0947w5vma7rhy3iyba-python-jupyterlab-server-1.2.0.drv
>>>        /gnu/store/s7jc2dbb0bnrahxklmszmpfv8klgw3sd-jupyterlab-server-1.2.0.tar.gz.drv
>>>
>>>     4,2 MB will be downloaded
>>>     downloading from https://ci.guix.gnu.org/nar/lzip/2nahbs5v8q073gjmy224gk0h5lsh1kkw-python-nbconvert-5.0.0b1 ...
>>>      python-nbconvert-5.0.0b1  301KiB                                                                                                                                                                                                     2.0MiB/s 00:00 [##################] 100.0%
>>>
>>>     building /gnu/store/s7jc2dbb0bnrahxklmszmpfv8klgw3sd-jupyterlab-server-1.2.0.tar.gz.drv...
>>>     |builder for `/gnu/store/s7jc2dbb0bnrahxklmszmpfv8klgw3sd-jupyterlab-server-1.2.0.tar.gz.drv' failed to produce output path `/gnu/store/92md7gh966n4fzj6al267lqq4xjx0ncf-jupyterlab-server-1.2.0.tar.gz'
>>>     build of /gnu/store/s7jc2dbb0bnrahxklmszmpfv8klgw3sd-jupyterlab-server-1.2.0.tar.gz.drv failed
>>>     View build log at '/var/log/guix/drvs/s7/jc2dbb0bnrahxklmszmpfv8klgw3sd-jupyterlab-server-1.2.0.tar.gz.drv.bz2'.
>>>     cannot build derivation `/gnu/store/n9i421lrbwrr8d0947w5vma7rhy3iyba-python-jupyterlab-server-1.2.0.drv': 1 dependencies couldn't be built
>>>     killing process 7384
>>>     guix environment: error: build of `/gnu/store/n9i421lrbwrr8d0947w5vma7rhy3iyba-python-jupyterlab-server-1.2.0.drv' failed
>>>     ~~~~~END~~~~~
>>>
>>>     OK, an error, perhaps I can understand it. Lets look at that log file:
>>>
>>>     ~~~~START~~~~
>>>     $ cp /var/log/guix/drvs/s7/jc2dbb0bnrahxklmszmpfv8klgw3sd-jupyterlab-server-1.2.0.tar.gz.drv.bz2 .
>>>     $ bzip2 --decompress jc2dbb0bnrahxklmszmpfv8klgw3sd-jupyterlab-server-1.2.0.tar.gz.drv.bz2
>>>     $ cat jc2dbb0bnrahxklmszmpfv8klgw3sd-jupyterlab-server-1.2.0.tar.gz.drv
>>>
>>>     Starting download of /gnu/store/92md7gh966n4fzj6al267lqq4xjx0ncf-jupyterlab-server-1.2.0.tar.gz
>>>     From https://files.pythonhosted.org/packages/source/j/jupyterlab-server/jupyterlab-server-1.2.0.tar.gz...
>>>     download failed "https://files.pythonhosted.org/packages/source/j/jupyterlab-server/jupyterlab-server-1.2.0.tar.gz" 404 "Not Found"
>>>
>>>     Starting download of /gnu/store/92md7gh966n4fzj6al267lqq4xjx0ncf-jupyterlab-server-1.2.0.tar.gz
>>>     From https://ci.guix.gnu.org/file/jupyterlab-server-1.2.0.tar.gz/sha256/132xby7531rbrjg9bqvsx86birr1blynjxy8gi5kcnb6x7fxjcal...
>>>     download failed "https://ci.guix.gnu.org/file/jupyterlab-server-1.2.0.tar.gz/sha256/132xby7531rbrjg9bqvsx86birr1blynjxy8gi5kcnb6x7fxjcal" 404 "Not Found"
>>>
>>>     Starting download of /gnu/store/92md7gh966n4fzj6al267lqq4xjx0ncf-jupyterlab-server-1.2.0.tar.gz
>>>     From https://tarballs.nixos.org/sha256/132xby7531rbrjg9bqvsx86birr1blynjxy8gi5kcnb6x7fxjcal...
>>>     download failed "https://tarballs.nixos.org/sha256/132xby7531rbrjg9bqvsx86birr1blynjxy8gi5kcnb6x7fxjcal" 404 "Not Found"
>>>
>>>     Starting download of /gnu/store/92md7gh966n4fzj6al267lqq4xjx0ncf-jupyterlab-server-1.2.0.tar.gz
>>>     From https://archive.softwareheritage.org/api/1/content/sha256:5431d9dde96659364b7cc877693d5d21e7b80cea7ae3959ecc2b87518e5f5d8c/raw/...
>>>     download failed "https://archive.softwareheritage.org/api/1/content/sha256:5431d9dde96659364b7cc877693d5d21e7b80cea7ae3959ecc2b87518e5f5d8c/raw/" 404 "Not Found"
>>>     failed to download "/gnu/store/92md7gh966n4fzj6al267lqq4xjx0ncf-jupyterlab-server-1.2.0.tar.gz" from "https://files.pythonhosted.org/packages/source/j/jupyterlab-server/jupyterlab-server-1.2.0.tar.gz"
>>>     ~~~~~END~~~~~
>>>
>>>     So it seems, that the jupyterlab-server file is simply not downloadable
>>>     any longer!
>>>
>>>     Trying using wget:
>>>
>>>     ~~~~START~~~~
>>>     $ wget https://files.pythonhosted.org/packages/source/j/jupyterlab-server/jupyterlab-server-1.2.0.tar.gz
>>>     --2020-10-18 13:49:52--  https://files.pythonhosted.org/packages/source/j/jupyterlab-server/jupyterlab-server-1.2.0.tar.gz
>>>     Resolving files.pythonhosted.org (files.pythonhosted.org)... 2a04:4e42:9::319, 151.101.37.63
>>>     Connecting to files.pythonhosted.org (files.pythonhosted.org)|2a04:4e42:9::319|:443... failed: Connection refused.
>>>     Connecting to files.pythonhosted.org (files.pythonhosted.org)|151.101.37.63|:443... connected.
>>>     HTTP request sent, awaiting response... 404 Not Found
>>>     2020-10-18 13:49:53 ERROR 404: Not Found.
>>>     ~~~~~END~~~~~
>>>
>>>     So now I am out of ideas. It seems the file is not available any longer
>>>     and the definition of jupyterlab needs to be updated somewhere, so that
>>>     it does not try to download an old or non-existent version of
>>>     jupyter-labserver. But how is this usually done? Can I specify it
>>>     somewhere in one of the 3 files I have, or am I dependent on someone
>>>     fixing the jupyterlab-server dependency / input for juypterlab?
>>>
>>>     Thanks for your help so far! Tell me, if I need to provide any more
>>>     information to solve the problem.
>>     Try chaning the URL line to (uri (pypi-uri "jupyterlab_server" version)),
>>     with an underscore (_). I don't have any special suggestions for knowing
>>     that it should be an underscore instead of a dash. The best I have is
>>     the output from 'guix import pypi jupyterlab-server:
>>
>>     (ins)efraim@E5400 ~$ guix import pypi jupyterlab-server
>>
>>     Starting download of /tmp/guix-file.ayJ41F
>>     From https://files.pythonhosted.org/packages/92/54/5f321ca4cebfb644ac59eb21601b46a2ff9831ffe1b4e5a588f2a7e98d48/jupyterlab_server-1.2.0.tar.gz...
>>      …er-1.2.0.tar.gz  22KiB               57KiB/s 00:00 [##################] 100.0%
>>
>>
>>
>>>     Best regards,
>>>     Zelphir
>>>
>>>
>>>     On 10/16/20 2:25 PM, Tobias Geerinckx-Rice wrote:
>>>>     Zelphir,
>>>>
>>>>     Zelphir Kaltstahl 写道：
>>>>>     $ guix import pypi 'jupyterlab@2.1.5' --recursive
>>>>     It will work if you substitute ‘/’ for ‘@’.  Yes, this is a happy
>>>>     accident specific to the PyPI importer, and I'm sure you can guess why
>>>>     it happens to work.
>>>>
>>>>>>     guix import hackage mtl@2.1.3.1
>>>>>     But that is in the "hackage" import section. Is the same not available
>>>>>     for PyPI?
>>>>     [...]
>>>>
>>>>>     Do the various importers work differently?
>>>>     Unfortunately so.  It would be great(TM) if PACKAGE[@VERSION] were
>>>>     standard.  Each importer could handle it properly (e.g., by turning it
>>>>     into "/") or return a friendlier ‘the foo importer does not yet
>>>>     support versions’ error.
>>>>
>>>>     I don't have the time, but this sounds like a good intermediate-level
>>>>     hack for someone who does :-)
>>>>
>>>>     Kind regards,
>>>>
>>>>     T G-R
>>>     -- 
>>>     repositories: https://notabug.org/ZelphirKaltstahl
>>>
>     -- 
>     repositories: https://notabug.org/ZelphirKaltstahl
>
>
> -- 
> Sent from my Android device with K-9 Mail. Please excuse my brevity. 

-- 
repositories: https://notabug.org/ZelphirKaltstahl