Python之Anaconda启动过程中的异常错误的解决

左手的ㄟ右手 2022-05-16 01:08 3457阅读 0赞

## Anaconda ##

一个非常优秀的python发行版本。

## 问题的提出 ##

某天，忽然发现，启动spyder之后，一直在Connecting to Kernel， Loading起来没完没了，本质上就是连接不上了。  
启动IPython之时，报出如下的错误信息：  
![这里写图片描述][70]

ERROR:tornado.general:Uncaught exception in ZMQStream callback
    Traceback (most recent call last):
    File "d:\ProgramData\Anaconda3\lib\site-packages\zmq\eventloop\zmqstream.py", line 432, in _run_callback
    callback(*args, **kwargs)
    File "d:\ProgramData\Anaconda3\lib\site-packages\tornado\stack_context.py", line 277, in null_wrapper
    return fn(*args, **kwargs)
    File "d:\ProgramData\Anaconda3\lib\site-packages\ipykernel\kernelbase.py", line 283, in dispatcher
    return self.dispatch_shell(stream, msg)
    File "d:\ProgramData\Anaconda3\lib\site-packages\ipykernel\kernelbase.py", line 233, in dispatch_shell
    self.pre_handler_hook()
    File "d:\ProgramData\Anaconda3\lib\site-packages\ipykernel\kernelbase.py", line 248, in pre_handler_hook
    self.saved_sigint_handler = signal(SIGINT, default_int_handler)
    File "d:\ProgramData\Anaconda3\lib\signal.py", line 47, in signal
    handler = _signal.signal(_enum_to_int(signalnum), _enum_to_int(handler))
    ValueError: signal only works in main thread
    ERROR:tornado.general:Uncaught exception in zmqstream callback
    Traceback (most recent call last):
    File "d:\ProgramData\Anaconda3\lib\site-packages\zmq\eventloop\zmqstream.py", line 450, in _handle_events
    self._handle_recv()
    File "d:\ProgramData\Anaconda3\lib\site-packages\zmq\eventloop\zmqstream.py", line 480, in _handle_recv
    self._run_callback(callback, msg)
    File "d:\ProgramData\Anaconda3\lib\site-packages\zmq\eventloop\zmqstream.py", line 432, in _run_callback
    callback(*args, **kwargs)
    File "d:\ProgramData\Anaconda3\lib\site-packages\tornado\stack_context.py", line 277, in null_wrapper
    return fn(*args, **kwargs)
    File "d:\ProgramData\Anaconda3\lib\site-packages\ipykernel\kernelbase.py", line 283, in dispatcher
    return self.dispatch_shell(stream, msg)
    File "d:\ProgramData\Anaconda3\lib\site-packages\ipykernel\kernelbase.py", line 233, in dispatch_shell
    self.pre_handler_hook()
    File "d:\ProgramData\Anaconda3\lib\site-packages\ipykernel\kernelbase.py", line 248, in pre_handler_hook
    self.saved_sigint_handler = signal(SIGINT, default_int_handler)
    File "d:\ProgramData\Anaconda3\lib\signal.py", line 47, in signal
    handler = _signal.signal(_enum_to_int(signalnum), _enum_to_int(handler))
    ValueError: signal only works in main thread
    ERROR:tornado.application:Exception in callback functools.partial(.null_wrapper at 0x0000000005B33488>)
    Traceback (most recent call last):
    File "d:\ProgramData\Anaconda3\lib\site-packages\tornado\ioloop.py", line 605, in _run_callback
    ret = callback()
    File "d:\ProgramData\Anaconda3\lib\site-packages\tornado\stack_context.py", line 277, in null_wrapper
    return fn(*args, **kwargs)
    File "d:\ProgramData\Anaconda3\lib\site-packages\zmq\eventloop\zmqstream.py", line 536, in 
    self.io_loop.add_callback(lambda : self._handle_events(self.socket, 0))
    File "d:\ProgramData\Anaconda3\lib\site-packages\zmq\eventloop\zmqstream.py", line 450, in _handle_events
    self._handle_recv()
    File "d:\ProgramData\Anaconda3\lib\site-packages\zmq\eventloop\zmqstream.py", line 480, in _handle_recv
    self._run_callback(callback, msg)
    File "d:\ProgramData\Anaconda3\lib\site-packages\zmq\eventloop\zmqstream.py", line 432, in _run_callback
    callback(*args, **kwargs)
    File "d:\ProgramData\Anaconda3\lib\site-packages\tornado\stack_context.py", line 277, in null_wrapper
    return fn(*args, **kwargs)
    File "d:\ProgramData\Anaconda3\lib\site-packages\ipykernel\kernelbase.py", line 283, in dispatcher
    return self.dispatch_shell(stream, msg)
    File "d:\ProgramData\Anaconda3\lib\site-packages\ipykernel\kernelbase.py", line 233, in dispatch_shell
    self.pre_handler_hook()
    File "d:\ProgramData\Anaconda3\lib\site-packages\ipykernel\kernelbase.py", line 248, in pre_handler_hook
    self.saved_sigint_handler = signal(SIGINT, default_int_handler)
    File "d:\ProgramData\Anaconda3\lib\signal.py", line 47, in signal
    handler = _signal.signal(_enum_to_int(signalnum), _enum_to_int(handler))
    ValueError: signal only works in main thread

从错误信息来看，肯定是某个包的版本冲突导致的问题。

## 问题的解决 ##

从网络上，找了一番之后，决定如下尝试：

> conda uninstall jupyter tornado

在卸载之后，重新安装:

> conda install jupyter tornado

安装过程中的信息输出如下：

Solving environment: done ==> WARNING: A newer version of conda exists. <==
      current version: 4.4.6
      latest version: 4.5.9
    
    Please update conda by running
    
        $ conda update -n base conda
    
    
    
    ## Package Plan ##
    
      environment location: D:\ProgramData\Anaconda3
    
      added / updated specs:
        - jupyter
        - tornado
    
    
    The following packages will be downloaded:
    
        package                    |            build
        ---------------------------|-----------------
        ipykernel-4.8.2            |           py36_0         146 KB
        ipywidgets-7.4.0           |           py36_0         150 KB
        jupyter_client-5.2.3       |           py36_0         188 KB
        nbconvert-5.3.1            |           py36_0         422 KB
        widgetsnbextension-3.4.0   |           py36_0         1.7 MB
        tornado-5.1                |   py36hfa6e2cd_0         669 KB
        jupyter-1.0.0              |           py36_5           6 KB
        jupyter_console-5.2.0      |           py36_1          53 KB
        ------------------------------------------------------------
                                               Total:         3.3 MB
    
    The following NEW packages will be INSTALLED:
    
        jupyter:            1.0.0-py36_5
        jupyter_console:    5.2.0-py36_1
        tornado:            5.1-py36hfa6e2cd_0
    
    The following packages will be UPDATED:
    
        ipykernel:          4.6.1-py36hbb77b34_0 --> 4.8.2-py36_0
        ipywidgets:         7.0.0-py36h2e74ada_0 --> 7.4.0-py36_0
        jupyter_client:     5.2.2-py36_0         --> 5.2.3-py36_0
        nbconvert:          5.3.1-py36h8dc0fde_0 --> 5.3.1-py36_0
        widgetsnbextension: 3.0.2-py36h364476f_1 --> 3.4.0-py36_0
    
    Proceed ([y]/n)? y
    
    
    Downloading and Extracting Packages
    ipykernel 4.8.2: ################################################################ ipywidgets 7.4.0: ###############################################################
    jupyter_client 5.2.3: ########################################################### nbconvert 5.3.1: ################################################################
    widgetsnbextension 3.4.0: #######################################################
    tornado 5.1: ####################################################################
    jupyter 1.0.0: ##################################################################
    jupyter_console 5.2.0: ########################################################## Preparing transaction: done Verifying transaction: done Executing transaction: done

## 总结 ##

常从河边走，偶尔会湿鞋，这些工具偶尔也会报错的，出了问题，就尝试解决就好了。

[70]: /images/20220516/ea5bada2c0c147a2b97bf2a2fe9ef8a3.png