新鲜的 Anaconda 安装给出“ImportError: cannot import name 'constants' from 'zmq.backend.cython'”

Question

更新了我之前的 Spyder 安装，导致依赖问题，因此决定卸载并重新安装 Anaconda。

DLed 并安装了 Anaconda3.2018.12。安装成功完成，但在启动时，内核没有启动，在控制台中给出以下错误消息：

> Traceback (most recent call last): File
> "C:\ProgramData\Anaconda3\lib\runpy.py", line 193, in
> _run_module_as_main "__main__", mod_spec) File "C:\ProgramData\Anaconda3\lib\runpy.py", line 85, in _run_code
> exec(code, run_globals) File "C:\Program
> Files\Python36\Lib\site‑packages\spyder_kernels\console\__main__.py",
> line 11, in  start.main() File "C:\Program
> Files\Python36\Lib\site‑packages\spyder_kernels\console\start.py",
> line 289, in main from ipykernel.kernelapp import IPKernelApp File
> "C:\Program Files\Python36\Lib\site‑packages\ipykernel\__init__.py",
> line 2, in  from .connect import * File "C:\Program
> Files\Python36\Lib\site‑packages\ipykernel\connect.py", line 18, in 
> import jupyter_client File "C:\Program
> Files\Python36\Lib\site‑packages\jupyter_client\__init__.py", line 4,
> in  from .connect import * File "C:\Program
> Files\Python36\Lib\site‑packages\jupyter_client\connect.py", line 23,
> in  import zmq File "C:\Program
> Files\Python36\Lib\site‑packages\zmq\__init__.py", line 47, in  from
> zmq import backend File "C:\Program
> Files\Python36\Lib\site‑packages\zmq\backend\__init__.py", line 40, in
> reraise(*exc_info) File "C:\Program
> Files\Python36\Lib\site‑packages\zmq\utils\sixcerpt.py", line 34, in
> reraise raise value File "C:\Program
> Files\Python36\Lib\site‑packages\zmq\backend\__init__.py", line 27, in
> 
> _ns = select_backend(first) File "C:\Program Files\Python36\Lib\site‑packages\zmq\backend\select.py", line 27, in
> select_backend mod = __import__(name, fromlist=public_api) File
> "C:\Program
> Files\Python36\Lib\site‑packages\zmq\backend\cython\__init__.py", line
> 6, in  from . import (constants, error, message, context, ImportError:
> cannot import name 'constants' from 'zmq.backend.cython' (C:\Program
> Files\Python36\Lib\site‑packages\zmq\backend\cython\__init__.py)

我尝试升级 pyzmq，但无济于事。卸载并重新安装 pyzmq 也不起作用。

我也将 ipython 升级到 7.2，以防有未指定的依赖项，没有骰子。

有解决这个问题的想法吗？

Answer 1

你混合了两个 Python 版本，这里的一个：

C:\ProgramData\Anaconda3

还有一个在这里

C:\Program Files\Python36\

由于您声称要使用 Anaconda，因此您需要删除第二次安装才能使事情按预期工作。