Jupyter labextension install issue

[ticlazau]

Hello,

I try to install several labextension install that privious work but not with the latest version.

jupyter labextension install jupyterlab_tensorboard
An error occured.
UnicodeDecodeError: 'ascii' codec can't decode byte 0xf0 in position 23: ordinal not in range(128)
See the log file for details: /tmp/jupyterlab-debug-mpueqhlx.log

more /tmp/jupyterlab-debug-mpueqhlx.log
Yarn configuration loaded.
Node v10.13.0

/home/florin/anaconda3/envs/wmlce-1.6.2/bin/npm pack jupyterlab_tensorboard
Traceback (most recent call last):

File "/home/florin/anaconda3/envs/wmlce-1.6.2/lib/python3.6/site-packages/jupyterlab/debuglog.py", line 47, in debug_loggi
ng
yield

File "/home/florin/anaconda3/envs/wmlce-1.6.2/lib/python3.6/site-packages/jupyterlab/labextensions.py", line 93, in start
ans = self.run_task()

File "/home/florin/anaconda3/envs/wmlce-1.6.2/lib/python3.6/site-packages/jupyterlab/labextensions.py", line 149, in run_t
ask
for i, arg in enumerate(self.extra_args)

File "/home/florin/anaconda3/envs/wmlce-1.6.2/lib/python3.6/site-packages/jupyterlab/labextensions.py", line 149, in
for i, arg in enumerate(self.extra_args)

File "/home/florin/anaconda3/envs/wmlce-1.6.2/lib/python3.6/site-packages/jupyterlab/commands.py", line 398, in install_ex
tension
return handler.install_extension(extension, pin=pin)

File "/home/florin/anaconda3/envs/wmlce-1.6.2/lib/python3.6/site-packages/jupyterlab/commands.py", line 611, in install_ex
tension
info = self._install_extension(extension, tempdir, pin=pin)

File "/home/florin/anaconda3/envs/wmlce-1.6.2/lib/python3.6/site-packages/jupyterlab/commands.py", line 1507, in install
extension
info = self._extract_package(extension, tempdir, pin=pin)

File "/home/florin/anaconda3/envs/wmlce-1.6.2/lib/python3.6/site-packages/jupyterlab/commands.py", line 1574, in extract
package
ret = self._run([which('npm'), 'pack', source], cwd=tempdir)

File "/home/florin/anaconda3/envs/wmlce-1.6.2/lib/python3.6/site-packages/jupyterlab/commands.py", line 1748, in _run
return proc.wait()

File "/home/florin/anaconda3/envs/wmlce-1.6.2/lib/python3.6/site-packages/jupyterlab/commands.py", line 107, in wait
out, _ = proc.communicate(timeout=.1)

File "/home/florin/anaconda3/envs/wmlce-1.6.2/lib/python3.6/subprocess.py", line 863, in communicate
stdout, stderr = self._communicate(input, endtime, timeout)

File "/home/florin/anaconda3/envs/wmlce-1.6.2/lib/python3.6/subprocess.py", line 1574, in _communicate
self.stdout.errors)

File "/home/florin/anaconda3/envs/wmlce-1.6.2/lib/python3.6/subprocess.py", line 760, in _translate_newlines
data = data.decode(encoding, errors)

UnicodeDecodeError: 'ascii' codec can't decode byte 0xf0 in position 23: ordinal not in range(128)

Exiting application: jupyter

Any idea how this can be solved?

Rgds,
Florin

[meeseeksmachine]

This issue has been mentioned on Jupyter Community Forum. There might be relevant details there:

https://discourse.jupyter.org/t/cant-install-any-extensions-ascii-codec-cannot-decode-byte/2044/5

[vidartf]

This seems weird. The sub-process code should be creating subprocess.Popen with the default value for universal_newlines and encoding, which should prevent Python from trying to decode anything as ASCII.

I see two things to try here:

• Are you able to test if this works with Python 3.7?
• Can you share the value from npm config get unicode? Can you try setting it to false with npm config set unicode false?

[gsaurabhr]

npm config set unicode false worked for me.