在C++ OpenFOAM中嵌入Python时加载Python模块时出错

lztngnrs  于 2023-01-28  发布在  Python
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    • TL; DR**我尝试在C++中运行OpenFOAM中嵌入的Python，但是包含一些Python模块会导致OpenFOAM失败，尽管Python脚本本身似乎运行良好。我尝试将模块位置附加到Python路径，但没有成功。

我编写了一个很长的Python脚本，用于将附加功能添加到OpenFOAM应用程序中。我希望将此Python脚本嵌入到OpenFOAM C代码中，以便它在应用程序的迭代循环中执行。
这是我在OpenFOAM C中包含的内容，用于初始化Python，嵌入我的模块和函数，并使用从OpenFOAM传递的两个参数（区域名称和温度）运行它：

// Set PYTHONPATH TO working directory
setenv("PYTHONPATH","../",1); 

Py_Initialize();

PyRun_SimpleString("import sys; sys.path.append('/some/path')\n");

PyObject* myModule = PyImport_ImportModule("couplingScript");

PyObject* myFunction = PyObject_GetAttrString(myModule,"couplingFunction");

PyObject* pZone = PyUnicode_FromString(zonename.c_str());

PyObject* pT = PyFloat_FromDouble(T);

PyObject* pArgs = PyTuple_Pack(2,pZone, pT);

PyObject* myResult = PyObject_CallObject(myFunction, pArgs);

PyErr_Print();

Py_Finalize();

这是我的www.example.com文件的简化版本，它在OpenFOAM中运行良好：couplingScript.py file, which runs fine from within OpenFOAM:

import sys

def couplingFunction(zone, T):
    print("Zone = " + zone)
    print("Temperature = " + str(T))

couplingFunction('Zone 1', 273)

OUTPUT:

Zone = Zone 1
Temperature = 273

但是，我需要包含两个额外的模块-numpy和pandas-才能运行完整的couplingScript文件，这是一个简化的示例：

import sys
import numpy as np
import pandas as pd

def couplingFunction(zone, T):
    print("Zone = " + zone)
    print("Temperature = " + str(T))
    numpy_check = np.zeros(2)
    pandas_check = pd.DataFrame()
    print(numpy_check)
    print(pandas_check)

couplingFunction('Zone 1', 273)

添加了这些内容后，www.example.com本身运行良好，但嵌入式Python失败了。couplingScript.py itself runs fine BUT the embedded Python fails.

OUTPUT running couplingScript.py from terminal via Python:

 Zone = Zone 1
 Temperature = 273
 Empty DataFrame
 Columns: []
 Index: []
 [0. 0.]

 OUTPUT running couplingScript.py from embedded OpenFOAM application:

 #0  Foam::error::printStack(Foam::Ostream&) at ??:?
 #1  Foam::sigFpe::sigHandler(int) at ??:?
 #2  ? in /lib/x86_64-linux-gnu/libc.so.6
 #3  ? at ??:?
 #4  PyNumber_Multiply in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #5  _PyEval_EvalFrameDefault in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #6  ? in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #7  ? in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #8  _PyEval_EvalFrameDefault in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #9  _PyEval_EvalCodeWithName in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #10  PyEval_EvalCodeEx in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #11  PyEval_EvalCode in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #12  ? in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #13  ? in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #14  PyVectorcall_Call in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #15  _PyEval_EvalFrameDefault in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #16  _PyEval_EvalCodeWithName in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #17  _PyFunction_Vectorcall in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #18  ? in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #19  _PyEval_EvalFrameDefault in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #20  ? in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #21  ? in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #22  _PyEval_EvalFrameDefault in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #23  ? in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #24  ? in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #25  _PyEval_EvalFrameDefault in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #26  ? in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #27  ? in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #28  _PyEval_EvalFrameDefault in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #29  ? in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #30  ? in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #31  _PyObject_CallMethodIdObjArgs in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #32  PyImport_ImportModuleLevelObject in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #33  ? in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #34  ? in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #35  _PyObject_MakeTpCall in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #36  ? in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #37  _PyEval_EvalFrameDefault in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #38  _PyEval_EvalCodeWithName in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #39  PyEval_EvalCodeEx in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #40  PyEval_EvalCode in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #41  ? in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #42  ? in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #43  PyVectorcall_Call in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #44  _PyEval_EvalFrameDefault in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #45  _PyEval_EvalCodeWithName in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #46  _PyFunction_Vectorcall in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #47  ? in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #48  _PyEval_EvalFrameDefault in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #49  ? in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #50  ? in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #51  _PyEval_EvalFrameDefault in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #52  ? in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #53  ? in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #54  _PyEval_EvalFrameDefault in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #55  ? in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #56  ? in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #57  _PyEval_EvalFrameDefault in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #58  ? in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #59  ? in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #60  _PyObject_CallMethodIdObjArgs in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #61  PyImport_ImportModuleLevelObject in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #62  _PyEval_EvalFrameDefault in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #63  _PyEval_EvalCodeWithName in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #64  PyEval_EvalCodeEx in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #65  PyEval_EvalCode in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #66  ? in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #67  ? in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #68  PyVectorcall_Call in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #69  _PyEval_EvalFrameDefault in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #70  _PyEval_EvalCodeWithName in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #71  _PyFunction_Vectorcall in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #72  ? in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #73  _PyEval_EvalFrameDefault in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #74  ? in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #75  ? in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #76  _PyEval_EvalFrameDefault in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #77  ? in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #78  ? in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #79  _PyEval_EvalFrameDefault in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #80  ? in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #81  ? in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #82  _PyEval_EvalFrameDefault in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #83  ? in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #84  ? in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #85  _PyObject_CallMethodIdObjArgs in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #86  PyImport_ImportModuleLevelObject in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #87  ? in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #88  ? in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #89  _PyObject_MakeTpCall in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #90  ? in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #91  PyObject_CallFunction in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #92  PyImport_Import in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #93  PyImport_ImportModule in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #94  ? in ~/OpenFOAM/ud215-v1906/platforms/linux64GccDPInt32Opt/bin/GeN-Foam
 #95  ? in ~/OpenFOAM/ud215-v1906/platforms/linux64GccDPInt32Opt/bin/GeN-Foam
 #96  ? in ~/OpenFOAM/ud215-v1906/platforms/linux64GccDPInt32Opt/bin/GeN-Foam
 #97  __libc_start_main in /lib/x86_64-linux-gnu/libc.so.6
 #98  ? in ~/OpenFOAM/ud215-v1906/platforms/linux64GccDPInt32Opt/bin/GeN-Foam
 Floating point exception (core dumped)

我尝试过的事情：

  • 通过pip安装numpy/panda可以得到：
  • Requirement already satisfied: numpy in /usr/lib/python3/dist-packages (1.17.4)
  • Requirement already satisfied: pandas in /usr/lib/python3/dist-packages (0.25.3)
  • 通过sys.path.append('/usr/lib/python3/dist-packages')将其直接附加到www.example.com中import sys之后的python路径中couplingScript.py:
  • 当通过OpenFOAM运行时，我会遇到与以前相同的错误
  • 使用以下命令直接从包位置导入：
  • import usr.lib.python3.dist-packages.numpy as np
  • import usr.lib.python3.dist-packages.pandas as pd
  • 我也试过：
  • from .usr.lib.python3.dist-packages import numpy as np
  • from .usr.lib.python3.dist-packages import pandas as pd

最后两个给出的误差略短：

#0  Foam::error::printStack(Foam::Ostream&) at ??:?
 #1  Foam::sigSegv::sigHandler(int) at ??:?
 #2  ? in /lib/x86_64-linux-gnu/libc.so.6
 #3  PyObject_GetAttrString in /lib/x86_64-linux-gnu/libpython3.8.so.1.0
 #4  ? in ~/OpenFOAM/ud215-v1906/platforms/linux64GccDPInt32Opt/bin/GeN-Foam
 #5  ? in ~/OpenFOAM/ud215-v1906/platforms/linux64GccDPInt32Opt/bin/GeN-Foam
 #6  ? in ~/OpenFOAM/ud215-v1906/platforms/linux64GccDPInt32Opt/bin/GeN-Foam
 #7  __libc_start_main in /lib/x86_64-linux-gnu/libc.so.6
 #8  ? in ~/OpenFOAM/ud215-v1906/platforms/linux64GccDPInt32Opt/bin/GeN-Foam
 Segmentation fault (core dumped)`

我还在两次运行中运行了print(sys.path)，得到：
从终端运行Python：

['/home/abc123/Coupled_model/GF', '/usr/lib/python38.zip', '/usr/lib/python3.8', '/usr/lib/python3.8/lib-dynload', '/home/abc123/.local/lib/python3.8/site-packages', '/usr/local/lib/python3.8/dist-packages', '/usr/lib/python3/dist-packages']

OpenFOAM中的嵌入式python：

['/home/abc123/Coupled_model/GF', '/usr/lib/python38.zip', '/usr/lib/python3.8', '/usr/lib/python3.8/lib-dynload', '/home/abc123/.local/lib/python3.8/site-packages', '/usr/local/lib/python3.8/dist-packages', '/usr/lib/python3/dist-packages']

如果它们是相同的，为什么嵌入的python不能识别numpy和panda？？？

c++

1条答案

按热度按时间
mwkjh3gx

mwkjh3gx1#

您可以在PyImport_ImportModule之后插入这段代码以获得更多信息吗？

if (PyErr_Occurred()) {
    PyErr_PrintEx(0);
    PyErr_Clear();
}
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