This is the flake.nix I use.

{   description = "";

  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";   inputs.flake-utils.url = "github:numtide/flake-utils";


outputs = { self, nixpkgs, flake-utils }:
    flake-utils.lib.eachDefaultSystem (system:
      let
        pkgs = nixpkgs.legacyPackages.${system};
        python = pkgs.python312;

        pyecharts = with pkgs.python3Packages;
          buildPythonPackage rec {
            pname = "pyecharts";
            version = "2.0.6";

            src = pkgs.fetchPypi {
              inherit pname version;
              sha256 = "4d7f8dcbee1525a6eeecab589efcdbe939feee4c46930d90b2734bff04077ecc";
            };
        };

        python_packages = python.withPackages(ps: with ps;[
          ipython
          pyecharts
          streamlit 
        ]);

        myDevTools = [
          python_packages
        ];
      in {
        devShells.default = pkgs.mkShell {
          buildInputs = myDevTools;          
        };
      }); }

After running

nix develop

, I get this error

error: builder for
‘/nix/store/5cmw2nmna4fwc3jsqqmi6rspkvvsbmkq-python3.12-pyecharts-2.0.6.drv’
failed with exit code 1;
last 10 log lines:
> ws.require(requires)
> File “/nix/store/x03rhgdr578lszbh5kgxrngv9xm77gxb-python3.12-setuptools-70.0.0/lib/python3.12/site-packages/pkg_resources/init.py”,
line 926, in require
> needed = self.resolve(parse_requirements(requirements))
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> File “/nix/store/x03rhgdr578lszbh5kgxrngv9xm77gxb-python3.12-setuptools-70.0.0/lib/python3.12/site-packages/pkg_resources/init.py”,
line 787, in resolve
> dist = self._resolve_dist(
> ^^^^^^^^^^^^^^^^^^^
> File “/nix/store/x03rhgdr578lszbh5kgxrngv9xm77gxb-python3.12-setuptools-70.0.0/lib/python3.12/site-packages/pkg_resources/init.py”,
line 828, in _resolve_dist
> raise DistributionNotFound(req, requirers)
> pkg_resources.DistributionNotFound: The ‘simplejson’ distribution was not found and is required by the application
For full logs, run ‘nix log /nix/store/5cmw2nmna4fwc3jsqqmi6rspkvvsbmkq-python3.12-pyecharts-2.0.6.drv’.
error: 1 dependencies of derivation
‘/nix/store/dnc88j3352c0x2692w8mikm9hfz7qn26-python3-3.12.4-env.drv’
failed to build error: 1 dependencies of derivation
‘/nix/store/v2az01iry2pdxsqkkikwrycv5zi4wmhr-nix-shell-env.drv’ failed
to build

As recommended, I run
nix log /nix/store/5cmw2nmna4fwc3jsqqmi6rspkvvsbmkq-python3.12-pyecharts-2.0.6.drv

@nix { “action”: “setPhase”, “phase”: “setuptoolsCheckPhase” } Running
phase: setuptoolsCheckPhase Executing setuptoolsCheckPhase Traceback
(most recent call last): File
“/build/pyecharts-2.0.6/nix_run_setup”, line 8, in
exec(compile(getattr(tokenize, ‘open’, open)(file).read().replace(‘rn’, ‘n’), file, ‘exec’))
File “setup.py”, line 72, in
setup( File “/nix/store/x03rhgdr578lszbh5kgxrngv9xm77gxb-python3.12-setuptools-70.0.0/lib/python3.12/site-packages/setuptools/init.py”,
line 103, in setup
return distutils.core.setup(**attrs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File “/nix/store/x03rhgdr578lszbh5kgxrngv9xm77gxb-python3.12-setuptools-70.0.0/lib/python3.12/site-packages/setuptools/_distutils/core.py”,
line 171, in setup
ok = dist.parse_command_line()
^^^^^^^^^^^^^^^^^^^^^^^^^ File “/nix/store/x03rhgdr578lszbh5kgxrngv9xm77gxb-python3.12-setuptools-70.0.0/lib/python3.12/site-packages/setuptools/_distutils/dist.py”,
line 476, in parse_command_line
args = self._parse_command_opts(parser, args)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File “/nix/store/x03rhgdr578lszbh5kgxrngv9xm77gxb-python3.12-setuptools-70.0.0/lib/python3.12/site-packages/setuptools/dist.py”,
line 870, in _parse_command_opts
nargs = _Distribution._parse_command_opts(self, parser, args)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File
“/nix/store/x03rhgdr578lszbh5kgxrngv9xm77gxb-python3.12-setuptools-70.0.0/lib/python3.12/site-packages/setuptools/_distutils/dist.py”,
line 535, in _parse_command_opts
cmd_class = self.get_command_class(command)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File “/nix/store/x03rhgdr578lszbh5kgxrngv9xm77gxb-python3.12-setuptools-70.0.0/lib/python3.12/site-packages/setuptools/dist.py”,
line 715, in get_command_class
self.cmdclass[command] = cmdclass = ep.load()
^^^^^^^^^ File “/nix/store/z7xxy35k7620hs6fn6la5fg2lgklv72l-python3-3.12.4/lib/python3.12/importlib/metadata/init.py”,
line 205, in load
module = import_module(match.group(‘module’))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File “/nix/store/z7xxy35k7620hs6fn6la5fg2lgklv72l-python3-3.12.4/lib/python3.12/importlib/init.py”,
line 90, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File “”, line 1387, in _gcd_import File
“”, line 1360, in _find_and_load File
“”, line 1331, in _find_and_load_unlocked
File “”, line 935, in _load_unlocked
File “”, line 995, in
exec_module File “”, line 488, in
_call_with_frames_removed File “/nix/store/x03rhgdr578lszbh5kgxrngv9xm77gxb-python3.12-setuptools-70.0.0/lib/python3.12/site-packages/setuptools/command/test.py”,
line 11, in
from pkg_resources import ( File “/nix/store/x03rhgdr578lszbh5kgxrngv9xm77gxb-python3.12-setuptools-70.0.0/lib/python3.12/site-packages/pkg_resources/init.py”,
line 3282, in
@_call_aside
^^^^^^^^^^^ File “/nix/store/x03rhgdr578lszbh5kgxrngv9xm77gxb-python3.12-setuptools-70.0.0/lib/python3.12/site-packages/pkg_resources/init.py”,
line 3266, in _call_aside
f(*args, **kwargs) File “/nix/store/x03rhgdr578lszbh5kgxrngv9xm77gxb-python3.12-setuptools-70.0.0/lib/python3.12/site-packages/pkg_resources/init.py”,
line 3295, in _initialize_master_working_set
working_set = _declare_state(‘object’, ‘working_set’, WorkingSet._build_master())
^^^^^^^^^^^^^^^^^^^^^^^^^^ File
“/nix/store/x03rhgdr578lszbh5kgxrngv9xm77gxb-python3.12-setuptools-70.0.0/lib/python3.12/site-packages/pkg_resources/init.py”,
line 589, in _build_master
ws.require(requires) File “/nix/store/x03rhgdr578lszbh5kgxrngv9xm77gxb-python3.12-setuptools-70.0.0/lib/python3.12/site-packages/pkg_resources/init.py”,
line 926, in require
needed = self.resolve(parse_requirements(requirements))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File “/nix/store/x03rhgdr578lszbh5kgxrngv9xm77gxb-python3.12-setuptools-70.0.0/lib/python3.12/site-packages/pkg_resources/init.py”,
line 787, in resolve
dist = self._resolve_dist(
^^^^^^^^^^^^^^^^^^^ File “/nix/store/x03rhgdr578lszbh5kgxrngv9xm77gxb-python3.12-setuptools-70.0.0/lib/python3.12/site-packages/pkg_resources/init.py”,
line 828, in _resolve_dist
raise DistributionNotFound(req, requirers) pkg_resources.DistributionNotFound: The ‘simplejson’ distribution was
not found and is required by the application

ButI still don’t understand the cause of the problem