Anaconda Jupyter笔记本未连接到python内核

我以前从python.org安装了python3.7，后来安装了anacondapython发行版。当我启动Jupyter笔记本时，内核无法连接。可能是什么问题，我试图重新安装，但它没有工作

下面是我得到的错误。

[I 00:23:53.252 NotebookApp]内核重启器：重新启动内核（4/5），新的随机端口
回溯（最近一次呼叫最后一次）：
文件“C:\Users\lenovo\AppData\Local\Programs\Python\Python37\lib\runpy.py”，第193行，位于主运行模块中
“\uuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu
文件“C:\Users\lenovo\AppData\Local\Programs\Python\Python37\lib\runpy.py”，第85行，在运行代码中
exec（代码、运行\全局）
文件“C:\Users\lenovo\AppData\Local\Programs\Python37\lib\site packages\ipykernel\u launcher.py”，第15行，在
从ipykernel导入内核应用程序作为应用程序
文件“C:\Users\lenovo\AppData\Local\Programs\Python\Python37\lib\site packages\ipykernel\\uuuu init\uuu.py”，第2行，在
从。连接导入*
文件“C:\Users\lenovo\AppData\Local\Programs\Python37\lib\site packages\ipykernel\connect.py”，第13行，在
从IPython.core.profiledir导入profiledir
文件“C:\Users\lenovo\AppData\Local\Programs\Python\37\lib\site packages\IPython\\uuuuuu init\uuuuuu.py”，第54行，在
from.core.application导入应用程序
文件“C:\Users\lenovo\AppData\Local\Programs\Python\37\lib\site packages\IPython\core\application.py”，第25行，在
从IPython.core导入版本，crashhandler
文件“C:\Users\lenovo\AppData\Local\Programs\Python\37\lib\site packages\IPython\core\crashhandler.py”，第27行，在
从IPython.core导入ultratb
文件“C:\Users\lenovo\AppData\Local\Programs\Python\37\lib\site packages\IPython\core\ultratb.py”，第115行，在
从IPython.core导入调试器
文件“C:\Users\lenovo\AppData\Local\Programs\Python\37\lib\site packages\IPython\core\debugger.py”，第47行，在
从pdb将pdb作为旧pdb导入
文件“C:\Users\lenovo\AppData\Local\Programs\Python\Python37\lib\pdb.py”，第76行，在
导入代码
文件“C:\Users\lenovo\Desktop\HW1_Q1\code.py”，第5行，在
“执行计数”：空，
NameError:未定义名称“null”
[W 00:23:56.368 NotebookApp]内核重启程序：重启失败
[W 00:23:56.368 NotebookApp]内核3087f4f8-f452-476b-becc-41f53a23cf80已死亡，正在从映射中删除。

---

• 创造康达环境
• 使用conda在其中安装Python+Jupyter
• 激活conda环境

康达确保已安装的部件安装在一起。。例如，在Linux操作系统上，安装了多个Python

此外,， 您是否可以在不指定文件的情况下运行jupyter notebook

 [I 00:23:53.252 NotebookApp] KernelRestarter: restarting kernel (4/5), new random ports
Traceback (most recent call last):
  File "C:\Users\lenovo\AppData\Local\Programs\Python\Python37\lib\runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "C:\Users\lenovo\AppData\Local\Programs\Python\Python37\lib\runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "C:\Users\lenovo\AppData\Local\Programs\Python\Python37\lib\site-packages\ipykernel_launcher.py", line 15, in <module>
    from ipykernel import kernelapp as app
  File "C:\Users\lenovo\AppData\Local\Programs\Python\Python37\lib\site-packages\ipykernel\__init__.py", line 2, in <module>
    from .connect import *
  File "C:\Users\lenovo\AppData\Local\Programs\Python\Python37\lib\site-packages\ipykernel\connect.py", line 13, in <module>
    from IPython.core.profiledir import ProfileDir
  File "C:\Users\lenovo\AppData\Local\Programs\Python\Python37\lib\site-packages\IPython\__init__.py", line 54, in <module>
    from .core.application import Application
  File "C:\Users\lenovo\AppData\Local\Programs\Python\Python37\lib\site-packages\IPython\core\application.py", line 25, in <module>
    from IPython.core import release, crashhandler
  File "C:\Users\lenovo\AppData\Local\Programs\Python\Python37\lib\site-packages\IPython\core\crashhandler.py", line 27, in <module>
    from IPython.core import ultratb
  File "C:\Users\lenovo\AppData\Local\Programs\Python\Python37\lib\site-packages\IPython\core\ultratb.py", line 115, in <module>
    from IPython.core import debugger
  File "C:\Users\lenovo\AppData\Local\Programs\Python\Python37\lib\site-packages\IPython\core\debugger.py", line 47, in <module>
    from pdb import Pdb as OldPdb
  File "C:\Users\lenovo\AppData\Local\Programs\Python\Python37\lib\pdb.py", line 76, in <module>
    import code
  File "C:\Users\lenovo\Desktop\HW1_Q1\code.py", line 5, in <module>
    "execution_count": null,
NameError: name 'null' is not defined
[W 00:23:56.368 NotebookApp] KernelRestarter: restart failed
[W 00:23:56.368 NotebookApp] Kernel 3087f4f8-f452-476b-becc-41f53a23cf80 died, removing from map.