{
  description = "virtual environment with python and streamlit";
  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.python311;
        f = ps: with ps;[
          ipython
          matplotlib
          pandas
        ];        
        pip_python_packages= python.withPackages(f);

        myDevTools = [
          pip_python_packages
          pkgs.streamlit
        ];
        outputName = builtins.attrNames self.outputs self.outputs;
      in {
        devShells.default = pkgs.mkShell {
          buildInputs = myDevTools;
        };

        packages.default = pkgs.poetry2nix.mkPoetryApplication {
          projectDir = self;
        };
        apps.default = {
          program  = "${python}/bin/python";
          args = [ "main.py" ];
          src = "./.";
          type = "app";
      };

      });
}

字符串
命令nix run“works”。不像预期的那样，它只打开python解释器，但这是另一个问题。
但是命令nix run不起作用
错误：...当评估属性'pkgs.buildPythonPackage'时

at /nix/store/s1z7nb9n6r5n0r34fabp6yybwkbr8mjk-source/pkgs/development/interpreters/python/passthrufun.nix:87:5:

       86|     withPackages = import ./with-packages.nix { inherit buildEnv pythonPackages;};
       87|     pkgs = pythonPackages;
         |     ^
       88|     interpreter = "${self}/bin/${executable}";

   … while calling the 'mapAttrs' builtin

     at /nix/store/s1z7nb9n6r5n0r34fabp6yybwkbr8mjk-source/pkgs/development/interpreters/python/passthrufun.nix:31:8:

       30|           value;
       31|     in lib.mapAttrs func items;
         |        ^
       32|   in ensurePythonModules (callPackage

   (stack trace truncated; use '--show-trace' to show the full trace)

   error: getting status of '/nix/store/ggvg85rp5qzyr9bngsl6r0pcrkyxqa49-source/poetry.lock': No

型
这样文件或目录
此错误消息不涉及我的代码的任何部分。这很难知道是哪个部分导致了问题