pylint: add the pythonpath environment from pythonpath-manager

spyder/plugins/pylint/main_widget.py

@@ -373,7 +373,10 @@ def _start(self):
             lambda ec, es=QProcess.ExitStatus: self._finished(ec, es))
 
         command_args = self.get_command(self.get_filename())
-        process.setProcessEnvironment(self.get_environment())
+        pythonpath_manager_values = self.get_conf(
+            'spyder_pythonpath', default=[], section='pythonpath_manager')
+        process.setProcessEnvironment(
+            self.get_environment(pythonpath_manager_values))
         process.start(sys.executable, command_args)
         running = process.waitForStarted()
         if not running:
@@ -933,11 +936,17 @@ def get_command(self, filename):
         return command_args
 
     @staticmethod
-    def get_environment() -> QProcessEnvironment:
+    def get_environment(pythonpath_manager_values: list
+                        ) -> QProcessEnvironment:
         """Get evironment variables for pylint command."""
         process_environment = QProcessEnvironment()
         process_environment.insert("PYTHONIOENCODING", "utf8")
 
+        if pythonpath_manager_values:
+            pypath = os.pathsep.join(pythonpath_manager_values)
+            # See PR spyder-ide/spyder#21891
+            process_environment.insert("PYTHONPATH", pypath)
+
         if os.name == 'nt':
             # Needed due to changes in Pylint 2.14.0
             # See spyder-ide/spyder#18175
@@ -947,7 +956,8 @@ def get_environment() -> QProcessEnvironment:
             # Needed for Windows installations using standalone Python and pip.
             # See spyder-ide/spyder#19385
             if not is_conda_based_app() and not is_anaconda():
-                process_environment.insert("APPDATA", os.environ.get("APPDATA"))
+                process_environment.insert("APPDATA",
+                                           os.environ.get("APPDATA"))
 
         return process_environment
 

spyder/plugins/pylint/tests/test_pylint.py

@@ -9,6 +9,7 @@
 
 # Standard library imports
 from io import open
+import os
 import os.path as osp
 from unittest.mock import Mock, MagicMock
 
@@ -65,6 +66,7 @@
 good-names=e
 """
 
+
 class MainWindowMock(QMainWindow):
     sig_editor_focus_changed = Signal(str)
 
@@ -333,28 +335,39 @@ def test_custom_interpreter(pylint_plugin, tmp_path, qtbot,
 
 def test_get_environment_windows(mocker):
     """Test that the environment variables match the Windows OS."""
-    mocker.patch("spyder.plugins.pylint.main_widget.os.name",
-                 "nt")
+    os_name_original = os.name
+    mocker.patch("spyder.plugins.pylint.main_widget.os.name", "nt")
     mocker.patch("spyder.plugins.pylint.main_widget.is_conda_based_app",
                  return_value=False)
     mocker.patch("spyder.plugins.pylint.main_widget.is_anaconda",
                  return_value=False)
     mocker.patch("spyder.plugins.pylint.main_widget.get_home_dir",
                  return_value='')
 
-    process_environment = Pylint.WIDGET_CLASS.get_environment()
+    process_environment = Pylint.WIDGET_CLASS.get_environment(
+        pythonpath_manager_values=["project_dir"])
 
-    assert process_environment.keys() ==\
-        ["APPDATA", "PYTHONIOENCODING", "USERPROFILE"]
+    try:
+        assert sorted(process_environment.keys()) ==\
+            ["APPDATA", "PYTHONIOENCODING", "PYTHONPATH", "USERPROFILE"]
+    finally:
+        mocker.patch("spyder.plugins.pylint.main_widget.os.name",
+                     os_name_original)
 
 
 def test_get_environment_nonwindows(mocker):
     """Test that the environment variables match the Linux and Mac OS."""
-    mocker.patch("spyder.plugins.pylint.main_widget.os.name",
-                 "posix")
-    process_environment = Pylint.WIDGET_CLASS.get_environment()
-
-    assert process_environment.keys() == ["PYTHONIOENCODING"]
+    os_name_original = os.name
+    mocker.patch("spyder.plugins.pylint.main_widget.os.name", "posix")
+    process_environment = Pylint.WIDGET_CLASS.get_environment(
+        pythonpath_manager_values=["project_dir"])
+
+    try:
+        assert sorted(process_environment.keys()) == \
+            ["PYTHONIOENCODING", "PYTHONPATH"]
+    finally:
+        mocker.patch("spyder.plugins.pylint.main_widget.os.name",
+                     os_name_original)
 
 
 if __name__ == "__main__":