Pip install fails with ujson error

[zerocewl]

Default pip installation fails with error for wrong ujson version.

pip install python-language-server

Error:

python-jsonrpc-server 0.4.0 requires ujson>=3.0.0, but you'll have ujson 1.35 which is incompatible.

Since the dependency lib python-jsonrpc-server was updated to v0.4 the updated ujson version leads to an incompatible installation with current settings ujson 1.35 in pyls.

Latest version of python-jsonrpc-server: https://pypi.org/project/python-jsonrpc-server/
Depending pr: https://github.com/palantir/python-jsonrpc-server/pull/44/files

Workaround: use python_jsonrpc_server<0.4

pip install python-jsonrpc-server<0.4
pip install python-language-server

Possible solutions:

• pin python_jsonrpc_server to v <0.4
• update ujson too

Maybe blocked by #808

Quick and easy fix by #859

[cuizaiyong]

When I use pip install python-language-server[all], the same problem occurred.

[izumism]

Following command resolve this problem in my case.
pip install python-language-server[all] --use-feature=2020-resolver

[aplanas]

Following command resolve this problem in my case.
pip install python-language-server[all] --use-feature=2020-resolver

Uhm this should fail when the server start, as one component (pyls or the jsonrpc-server) will complain that the incorrect version of ujson is installed.

[ccordoba12]

This will be fixed when PR #842 is merged and a new version is released.

[aplanas]

@GNSubrahmanyam this is the current bug, that ujson 1.35 is installed by requirements of pyls, but jsonrpc-server requires >=3.0. The patch from #842 fix this issue, installing ujson >=3.0 in pyls if Python 3 is used. We need to wait for the new release, or manually edit the METADATA in site-packages to fix the current mismatch

[izumism]

I use pip>=20.2 and It includes new feature of dependency resolver, but it is not included by default. The command --use-feature=2020-resolver enable this functionality as this announcement says.

[ghost]

Upgrading to python-language-server version 0.35.0 (https://github.com/palantir/python-language-server/releases/tag/0.35.0) solved the issue for us