Python 3.7 不能使用 DOCPLEX

Question

我编写了一个数学模型并想使用 DOCPLEX 模块来解决它。我的解释器是 Python 3.7。但是，在做了很多努力之后，我会遇到以下错误：

Traceback (most recent call last):
  File "C:\Users\xxx\PycharmProjects\pythonProject\venv\lib\site-packages\docplex\mp\environment.py", line 290, in get_cplex_module
    import cplex  #@UnresolvedImport
  File "C:\Program Files\IBM\ILOG\CPLEX_Studio201\cplex\python\3.8\x64_win64\cplex\__init__.py", line 44, in <module>
    from .aborter import Aborter
  File "C:\Program Files\IBM\ILOG\CPLEX_Studio201\cplex\python\3.8\x64_win64\cplex\aborter.py", line 13, in <module>
    from ._internal import _procedural as _proc
  File "C:\Program Files\IBM\ILOG\CPLEX_Studio201\cplex\python\3.8\x64_win64\cplex\_internal\__init__.py", line 20, in <module>
    from . import _list_array_utils
  File "C:\Program Files\IBM\ILOG\CPLEX_Studio201\cplex\python\3.8\x64_win64\cplex\_internal\_list_array_utils.py", line 14, in <module>
    from . import _pycplex as CPX
  File "C:\Program Files\IBM\ILOG\CPLEX_Studio201\cplex\python\3.8\x64_win64\cplex\_internal\_pycplex.py", line 13, in <module>
    from . import _pycplex_platform
  File "C:\Program Files\IBM\ILOG\CPLEX_Studio201\cplex\python\3.8\x64_win64\cplex\_internal\_pycplex_platform.py", line 22, in <module>
    from cplex._internal.py37_cplex2010 import *
ModuleNotFoundError: No module named 'cplex._internal.py37_cplex2010'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:/Users/xxx/PycharmProjects/pythonProject/EPC _LTC.py", line 11, in <module>
    mdl = Model("LTC")
  File "C:\Users\xxx\PycharmProjects\pythonProject\venv\lib\site-packages\docplex\mp\model.py", line 398, in __init__
    self._environment = self._make_environment()
  File "C:\Users\xxx\PycharmProjects\pythonProject\venv\lib\site-packages\docplex\mp\model.py", line 174, in _make_environment
    env = Environment.get_default_env()
  File "C:\Users\xxx\PycharmProjects\pythonProject\venv\lib\site-packages\docplex\mp\environment.py", line 427, in get_default_env
    Environment._default_env = Environment.make_new_configured_env()
  File "C:\Users\xxx\PycharmProjects\pythonProject\venv\lib\site-packages\docplex\mp\environment.py", line 422, in make_new_configured_env
    return Environment(start_auto_configure=True)
  File "C:\Users\xxx\PycharmProjects\pythonProject\venv\lib\site-packages\docplex\mp\environment.py", line 84, in __init__
    self.auto_configure(logger=logger)
  File "C:\Users\xxx\PycharmProjects\pythonProject\venv\lib\site-packages\docplex\mp\environment.py", line 220, in auto_configure
    self.check_cplex(logger=logger)
  File "C:\Users\xxx\PycharmProjects\pythonProject\venv\lib\site-packages\docplex\mp\environment.py", line 328, in check_cplex
    cplex = self.get_cplex_module(logger=logger)
  File "C:\Users\xxx\PycharmProjects\pythonProject\venv\lib\site-packages\docplex\mp\environment.py", line 314, in get_cplex_module
    cplex = load_cplex_from_cos_root(loc) if loc else None
  File "C:\Users\xxx\PycharmProjects\pythonProject\venv\lib\site-packages\docplex\mp\environment.py", line 286, in load_cplex_from_cos_root
    return load_cplex(full_path, version=version)
  File "C:\Users\xxx\PycharmProjects\pythonProject\venv\lib\site-packages\docplex\mp\environment.py", line 261, in load_cplex
    raise FileNotFoundError("Could not load module from %s" % module_location)
FileNotFoundError: Could not load module from C:\Program Files\IBM\ILOG\CPLEX_Studio201;C:\Program Files\IBM\ILOG\CPLEX_Studio201\cplex\python\3.7\x64_win64;C:\Program Files\IBM\ILOG\CPLEX_Studio201\cplex\python\3.7\x64_win64\cplex;\cplex\python\3.7\x64_win64\cplex\__init__.py

我已经在 Pycharm 的终端中运行了以下代码：

cd C:\Program Files\IBM\ILOG\CPLEX_Studio201\python
python setup.py install

或

cd C:\Program Files\IBM\ILOG\CPLEX_Studio201\python
python setup.py install --home C:\Users\xxx\PycharmProjects\pythonProject\venv\Lib\site-packages\cplex

最后，我还将自己用户名的路径变量设置为如下所示：

"C:\Program Files\IBM\ILOG\CPLEX_Studio129\cplex\python\3.6\x64_win64" and
"C:\Program Files\IBM\ILOG\CPLEX_Studio129\cplex\bin\x64_win64\cplex.exe"

Answer 1

就我而言，我升级到 python 3.8 并解决了问题

或者你可以使用这个：

pip install docplex==2.15.194

Answer 2

问题在于python setup.py install 不保证您使用的python 解释器与您的虚拟环境相同。

您需要在运行安装脚本之前激活您的环境。 请打开终端然后运行：

C:\Users\xxx\PycharmProjects\pythonProject\venv\Scripts\activate

那你就可以了

cd C:\Program Files\IBM\ILOG\CPLEX_Studio201\cplex\python
pip install .

Answer 3

Docplex 有一个check_list.py 脚本，可帮助诊断 cplex 版本的存在和位置。在存在 Python 的终端中，键入

$ python -m docplex.mp.check_list

答案如下：

* system is: Windows 64bit
* Python version 3.7.8, located at: C:\python\anaconda2020.02\envs\docplex37\python.exe
* docplex is present, version is 2.20.204
* CPLEX library is present, version is 12.10.0.0, located at: C:\OPTIM\cplex_distrib\cplex1210R0\python\3.7\x64_win64
* pandas is present, version is 1.1.4

Answer 4

从您发布的检查列表输出中，我可以看到您安装了 cos201。 在您的情况下，Docplex 需要位于 cos 内部的 Python/Cplex 接口：

C:/Program Files/IBM/ILOG/CPLEX_Studio201/cplex/python/3.7/x64_win64

此路径应作为content root 添加到您的 Pycharm 项目中（文件/设置/项目结构 -> 添加内容根目录

要检查这一点，请在 Pycharm 中打开 Python 控制台选项卡，然后尝试

import cplex

添加正确的路径后，这应该可以工作。 然后，您可以从控制台中运行检查列表：

from docplex.mp.check_list import run_docplex_check_list
run_docplex_check_list()

一旦成功，您的程序应该可以在 Pycharm 中解决问题。 这就是说，我看到您的 docplex 版本是 2.15，比 CPLEX 20.1 旧。您应该将 DOcplex 更新到与 CPLEX 20.1 兼容的最新版本。