Backport PR #23055 on branch 6.x (PR: Choose Qt binding to install from SPYDER_QT_BINDING environment variable)

setup.py

@@ -112,6 +112,47 @@ def get_packages():
     return packages
 
 
+def get_qt_requirements(qt_requirements, default='pyqt5'):
+    """
+    Return a list of requirements for the Qt binding according to the
+    environment variable SPYDER_QT_BINDING. If this variable is not set
+    or has an unsupported value it defaults to 'pyqt5'.
+
+    Parameters
+    ----------
+    qt_requirements : dict
+        A dictionary whose keys are supported Qt bindings and whose values are
+        lists of required packages to install for each binding.
+    default : str
+        Default Qt binding to use if the environment variable is not set.
+        Defaults to 'pyqt5'.
+
+    Raises
+    ------
+    ValueError
+        If the environment variable SPYDER_QT_BINDING has an unsupported value.
+
+    Returns
+    -------
+    install_requires : list
+        A list of required packages to install for the given Qt binding.
+    """
+    install_requires = []
+
+    # Check if a Qt binding is set in the environment and normalizes
+    env_qt_binding = os.environ.get('SPYDER_QT_BINDING', default)
+    env_qt_binding = env_qt_binding.lower()
+    install_requires = qt_requirements.get(env_qt_binding, None)
+
+    if install_requires is None:
+        raise ValueError(
+            f"Unsupported Qt binding: {env_qt_binding}. "
+            f"Supported: "  + ", ".join(qt_requirements.keys())
+        )
+
+    return install_requires
+
+
 # =============================================================================
 # Make Linux detect Spyder desktop file (will not work with wheels)
 # =============================================================================
@@ -201,8 +242,16 @@ def run(self):
     cmdclass=CMDCLASS,
 )
 
+# Qt bindings requirements
+qt_requirements = {
+    'pyqt5': ['pyqt5>=5.15,<5.16', 'pyqtwebengine>=5.15,<5.16'],
+    'pyqt6': ['pyqt6>=6.5,<7', 'pyqt6-webengine>=6.5,<7'],
+}
+
+# Get the proper requirements for the selected Qt binding
+install_requires = get_qt_requirements(qt_requirements, default='pyqt5')
 
-install_requires = [
+install_requires += [
     'aiohttp>=3.9.3',
     'applaunchservices>=0.3.0;platform_system=="Darwin"',
     'asyncssh>=2.14.0,<3.0.0',
@@ -232,8 +281,6 @@ def run(self):
     'pylint>=3.1,<4',
     'pylint-venv>=3.0.2',
     'pyls-spyder>=0.4.0',
-    'pyqt5>=5.15,<5.16',
-    'pyqtwebengine>=5.15,<5.16',
     'python-lsp-black>=2.0.0,<3.0.0',
     'python-lsp-server[all]>=1.12.0,<1.13.0',
     'pyuca>=1.2',

spyder/tests/test_dependencies_in_sync.py

@@ -88,16 +88,22 @@ def parse_setup_install_requires(fpath):
     start = None
     end = None
     for idx, line in enumerate(lines):
-        if line.startswith('install_requires = '):
+        if "'pyqt5': " in line:
+            idx_qt = idx
+
+        if line.startswith('install_requires += '):
             start = idx + 1
 
         if start is not None and line.startswith(']'):
             end = idx
             break
 
+    qt_deps = lines[idx_qt].split("'pyqt5': ")[1]
+    qt_deps = literal_eval(qt_deps[:qt_deps.index("]") + 1])
     dep_list = literal_eval('[' + '\n'.join(lines[start:end + 1]))
     dep_list = [item for item in dep_list if item[0] != '#']
-    for dep in dep_list:
+
+    for dep in dep_list + qt_deps:
         dep = dep.split(';')[0]
         name, ver = None, None