FreeCAD

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# SPDX-License-Identifier: LGPL-2.1-or-later
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# ***************************************************************************
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# *                                                                         *
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# *   Copyright (c) 2022-2023 FreeCAD Project Association                   *
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# *   Copyright (c) 2018 Gaël Écorchard <galou_breizh@yahoo.fr>             *
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# *                                                                         *
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# *   This file is part of FreeCAD.                                         *
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# *                                                                         *
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# *   FreeCAD is free software: you can redistribute it and/or modify it    *
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# *   under the terms of the GNU Lesser General Public License as           *
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# *   published by the Free Software Foundation, either version 2.1 of the  *
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# *   License, or (at your option) any later version.                       *
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# *                                                                         *
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# *   FreeCAD is distributed in the hope that it will be useful, but        *
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# *   WITHOUT ANY WARRANTY; without even the implied warranty of            *
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# *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU      *
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# *   Lesser General Public License for more details.                       *
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# *                                                                         *
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# *   You should have received a copy of the GNU Lesser General Public      *
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# *   License along with FreeCAD. If not, see                               *
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# *   <https://www.gnu.org/licenses/>.                                      *
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# *                                                                         *
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# ***************************************************************************
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import os
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import platform
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import shutil
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import FreeCAD
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def get_python_exe() -> str:
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    """Find Python. In preference order
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    A) The value of the PythonExecutableForPip user preference
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    B) The executable located in the same bin directory as FreeCAD and called "python3"
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    C) The executable located in the same bin directory as FreeCAD and called "python"
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    D) The result of a shutil search for your system's "python3" executable
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    E) The result of a shutil search for your system's "python" executable"""
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    prefs = FreeCAD.ParamGet("User parameter:BaseApp/Preferences/PythonConsole")
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    python_exe = prefs.GetString("ExternalPythonExecutable", "Not set")
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    fc_dir = FreeCAD.getHomePath()
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    if not python_exe or python_exe == "Not set" or not os.path.exists(python_exe):
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        python_exe = os.path.join(fc_dir, "bin", "python3")
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        if "Windows" in platform.system():
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            python_exe += ".exe"
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    if not python_exe or not os.path.exists(python_exe):
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        python_exe = os.path.join(fc_dir, "bin", "python")
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        if "Windows" in platform.system():
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            python_exe += ".exe"
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    if not python_exe or not os.path.exists(python_exe):
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        python_exe = shutil.which("python3")
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    if not python_exe or not os.path.exists(python_exe):
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        python_exe = shutil.which("python")
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    if not python_exe or not os.path.exists(python_exe):
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        return ""
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    python_exe = python_exe.replace("/", os.path.sep)
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    prefs.SetString("ExternalPythonExecutable", python_exe)
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    return python_exe
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