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python-3.x - minizinc 已安装但 python 认为没有

问题描述

pip 说minizinc已经安装了，但是当我尝试在代码中调用它时，它给了我一个错误，说它没有安装。

(backend) bash-3.2$ python
Python 3.8.3 (default, Jul  2 2020, 11:26:31) 
[Clang 10.0.0 ] :: Anaconda, Inc. on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> from minizinc import Instance, Model, Solver
/Users/miranda/.local/share/virtualenvs/backend-BjqhdW2P/lib/python3.8/site-packages/minizinc/__init__.py:25: RuntimeWarning: MiniZinc was not found on the system. No default driver could be initialised.
  warnings.warn(
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: cannot import name 'Instance' from 'minizinc' (/Users/miranda/.local/share/virtualenvs/backend-BjqhdW2P/lib/python3.8/site-packages/minizinc/__init__.py)
>>> exit()
(backend) bash-3.2$ pip install minizinc
Requirement already satisfied: minizinc in /Users/miranda/.local/share/virtualenvs/backend-BjqhdW2P/lib/python3.8/site-packages (0.4.2)
(backend) bash-3.2$ python3 -m pip install minizinc
Requirement already satisfied: minizinc in /Users/miranda/.local/share/virtualenvs/backend-BjqhdW2P/lib/python3.8/site-packages (0.4.2)
(backend) bash-3.2$ python -m pip install minizinc
Requirement already satisfied: minizinc in /Users/miranda/.local/share/virtualenvs/backend-BjqhdW2P/lib/python3.8/site-packages (0.4.2)

标签： python-3.xpippipenvminizinc

解决方案

正如 MiniZinc Python 的“入门”页面所解释的那样。MiniZinc Python 与 MiniZinc 本身不同，它只是从 Python 到 MiniZinc 的连接。

这意味着在您可以使用 MiniZinc Python 之前，您还必须安装 MiniZinc 包。这就是错误试图告诉你的。该捆绑包可以在MiniZinc 网站上找到。

请注意，安装后 MiniZinc Python 会在您使用 Python 时在您的计算机上查找minizinc可执行文件import minizinc。如果您没有在通常的位置安装 MiniZinc，那么您可能需要将PATH环境变量附加到目录中minizinc以使其工作。

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