执行conda update conda后遇_ctypes导入DLL失败，所有conda命令失效求助

问题描述 #

执行conda update conda后，所有conda命令均无法正常运行，每次执行都会抛出如下错误：

ImportError: DLL load failed while importing _ctypes: The specified module could not be found.

尝试过执行conda install libffi和conda install python修复，但问题依旧。执行conda install libffi时的完整报错信息如下：

(base) C:\Users\eyabe>conda install libffi
Traceback (most recent call last):
  File "C:\Users\eyabe\anaconda3\Lib\site-packages\conda\exception_handler.py", line 17, in __call__
    return func(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\eyabe\anaconda3\Lib\site-packages\conda\cli\main.py", line 36, in main_subshell
    from ..base.context import context
  File "C:\Users\eyabe\anaconda3\Lib\site-packages\conda\base\context.py", line 33, in <module>
    from ..common._os.linux import linux_get_libc_version
  File "C:\Users\eyabe\anaconda3\Lib\site-packages\conda\common\_os\__init__.py", line 8, in <module>
    from .windows import get_free_space_on_windows as get_free_space
  File "C:\Users\eyabe\anaconda3\Lib\site-packages\conda\common\_os\windows.py", line 11, in <module>
    from ctypes import (
  File "C:\Users\eyabe\anaconda3\Lib\ctypes\__init__.py", line 8, in <module>
    from _ctypes import Union, Structure, Array
ImportError: DLL load failed while importing _ctypes: The specified module could not be found.

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:\Users\eyabe\anaconda3\Scripts\conda-script.py", line 12, in <module>
    sys.exit(main())
             ^^^^^^
  File "C:\Users\eyabe\anaconda3\Lib\site-packages\conda\cli\main.py", line 109, in main
    return conda_exception_handler(main, *args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\eyabe\anaconda3\Lib\site-packages\conda\exception_handler.py", line 389, in conda_exception_handler
    return_value = exception_handler(func, *args, **kwargs)
                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\eyabe\anaconda3\Lib\site-packages\conda\exception_handler.py", line 20, in __call__
    return self.handle_exception(exc_val, exc_tb)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\eyabe\anaconda3\Lib\site-packages\conda\exception_handler.py", line 52, in handle_exception
    from .exceptions import (
  File "C:\Users\eyabe\anaconda3\Lib\site-packages\conda\exceptions.py", line 31, in <module>
    from .models.channel import Channel
  File "C:\Users\eyabe\anaconda3\Lib\site-packages\conda\models\channel.py", line 25, in <module>
    from ..base.context import Context, context
  File "C:\Users\eyabe\anaconda3\Lib\site-packages\conda\base\context.py", line 33, in <module>
    from ..common._os.linux import linux_get_libc_version
  File "C:\Users\eyabe\anaconda3\Lib\site-packages\conda\common\_os\__init__.py", line 8, in <module>
    from .windows import get_free_space_on_windows as get_free_space
  File "C:\Users\eyabe\anaconda3\Lib\site-packages\conda\common\_os\windows.py", line 11, in <module>
    from ctypes import (
  File "C:\Users\eyabe\anaconda3\Lib\ctypes\__init__.py", line 8, in <module>
    from _ctypes import Union, Structure, Array
ImportError: DLL load failed while importing _ctypes: The specified module could not be found.

解决方法 #

• 修复Visual C++ Redistributable：_ctypes依赖Visual C运行库，卸载现有版本后，下载安装对应版本的Microsoft Visual C Redistributable（建议选2019或2022版，x86和x64都装），重启电脑后重试conda命令。
• 替换损坏的DLL文件：从同版本的正常Anaconda安装包中，复制_ctypes.pyd（路径：Anaconda3\DLLs\_ctypes.pyd）和libffi-7.dll（路径：Anaconda3\Library\bin），替换当前安装目录下的同名文件。
• 重置conda初始化：打开CMD，切换到Anaconda的Scripts文件夹（如cd C:\Users\eyabe\anaconda3\Scripts），执行conda.exe init --reset，重启终端后测试。
• 重新安装Anaconda：若以上方法都无效，备份环境后卸载当前Anaconda，重新下载对应版本安装包完整安装。

内容的提问来源于stack exchange，提问作者Eya Besbes