Nvim LSP

In plugins/init.lua for Lazy Nvim:

{ "neovim/nvim-lspconfig",
  dependencies = {
    "williamboman/mason.nvim",
    "williamboman/mason-lspconfig.nvim"
  },
  config = function()
    local capabilities = vim.lsp.protocol.make_client_capabilities()
    capabilities = require('cmp_nvim_lsp').default_capabilities(capabilities)
 
    require('mason').setup()
    local mason_lspconfig = require 'mason-lspconfig'
    mason_lspconfig.setup {
        ensure_installed = { "pyright" }
    }
    require("lspconfig").pyright.setup {
        capabilities = capabilities,
    }
  end
},
  { "hrsh7th/nvim-cmp",
  dependencies = {
    "hrsh7th/cmp-nvim-lsp",
    "L3MON4D3/LuaSnip",
    "saadparwaiz1/cmp_luasnip"
  },
  config = function()
    local has_words_before = function()
      unpack = unpack or table.unpack
      local line, col = unpack(vim.api.nvim_win_get_cursor(0))
      return col ~= 0 and vim.api.nvim_buf_get_lines(0, line - 1, line, true)[1]:sub(col, col):match("%s") == nil
    end
 
    local cmp = require('cmp')
    local luasnip = require('luasnip')
 
    cmp.setup({
      snippet = {
        expand = function(args)
          luasnip.lsp_expand(args.body)
        end
      },
      completion = {
        autocomplete = false
      },
      mapping = cmp.mapping.preset.insert ({
        ["<Tab>"] = cmp.mapping(function(fallback)
          if cmp.visible() then
            cmp.select_next_item()
          elseif luasnip.expand_or_jumpable() then
            luasnip.expand_or_jump()
          elseif has_words_before() then
            cmp.complete()
          else
            fallback()
          end
        end, { "i", "s" }),
        ["<s-Tab>"] = cmp.mapping(function(fallback)
          if cmp.visible() then
            cmp.select_prev_item()
          elseif luasnip.jumpable(-1) then
            luasnip.jump(-1)
          else
            fallback()
          end
        end, { "i", "s" }),
        ["<c-e>"] = cmp.mapping.abort(),
        ["<CR>"] = cmp.mapping.confirm({ select=true }),
      }),
      sources = {
        { name = "nvim_lsp" },
        { name = "luasnip" },
      }
    })
  end
},