update files

update files

001-install.ipynb

@@ -95,7 +95,7 @@
     "\n",
     "![image.png](attachment:7c85b5a5-1934-449b-abd3-43cd5ccb43be.png)\n",
     "\n",
-    "再次打开 Jupyter Lab，默认根目录 修改成功."
+    "再次打开 Jupyter Lab，默认根目录修改成功。"
    ]
   },
   {

002-demo.ipynb

@@ -103,6 +103,7 @@
     "- `Ctrl-Enter` : 运行本单元\n",
     "- `Ctrl-Home` : 跳到单元开头\n",
     "- `Ctrl-S` : 文件存盘\n",
+    "- `Shift-Tab` : 提示\n",
     "\n",
     "可在命令模式按`H`或进入`Help > Keyboard Shortcuts`。可以查看键盘快捷键完整列表。如下：\n",
     "- `命令模式` (按键 Esc 开启)\n",

003-about-jupyter-notebook.ipynb

@@ -137,7 +137,7 @@
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": "Python 3 (ipykernel)",
+   "display_name": "Python 3",
    "language": "python",
    "name": "python3"
   },
@@ -151,9 +151,9 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.9.1"
+   "version": "3.8.8"
   }
  },
  "nbformat": 4,
  "nbformat_minor": 5
-}
\ No newline at end of file
+}

004-Exercise.ipynb

@@ -91,7 +91,7 @@
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": "Python 3 (ipykernel)",
+   "display_name": "Python 3",
    "language": "python",
    "name": "python3"
   },
@@ -105,7 +105,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.9.1"
+   "version": "3.8.8"
   }
  },
  "nbformat": 4,