PR: Make consoles to start without an stderr file

requirements/requirements.txt

@@ -9,7 +9,7 @@ pycodestyle
 pylint
 psutil
 qtawesome>=0.4.1
-qtpy>=1.1.0
+qtpy>=1.2.0
 pickleshare
 pyzmq
 chardet>=2.0.0

spyder/plugins/ipythonconsole.py

@@ -602,7 +602,8 @@ class IPythonConsole(SpyderPluginWidget):
                              "required to create IPython consoles. Please "
                              "make it writable.")
 
-    def __init__(self, parent, testing=False, test_dir=TEMPDIR):
+    def __init__(self, parent, testing=False, test_dir=TEMPDIR,
+                 test_no_stderr=False):
         """Ipython Console constructor."""
         if PYQT5:
             SpyderPluginWidget.__init__(self, parent, main = parent)
@@ -623,8 +624,11 @@ def __init__(self, parent, testing=False, test_dir=TEMPDIR):
         self.filenames = []
         self.mainwindow_close = False
         self.create_new_client_if_empty = True
+
+        # Attrs for testing
         self.testing = testing
         self.test_dir = test_dir
+        self.test_no_stderr = test_no_stderr
 
         # Initialize plugin
         if not self.testing:
@@ -1021,12 +1025,11 @@ def create_client_for_kernel(self):
     def connect_client_to_kernel(self, client):
         """Connect a client to its kernel"""
         connection_file = client.connection_file
-        try:
+
+        if self.test_no_stderr:
+            stderr_file = None
+        else:
             stderr_file = client.stderr_file
-        except PermissionError:
-            error_msg = self.permission_error_msg.format(TEMPDIR)
-            client.show_kernel_error(error_msg)
-            return
 
         km, kc = self.create_kernel_manager_and_kernel_client(connection_file,
                                                               stderr_file)
@@ -1430,7 +1433,10 @@ def create_kernel_manager_and_kernel_client(self, connection_file,
         kernel_manager._kernel_spec = kernel_spec
 
         # Save stderr in a file to read it later in case of errors
-        stderr = codecs.open(stderr_file, 'w', encoding='utf-8')
+        if stderr_file is not None:
+            stderr = codecs.open(stderr_file, 'w', encoding='utf-8')
+        else:
+            stderr = None
         kernel_manager.start_kernel(stderr=stderr)
 
         # Kernel client
@@ -1559,7 +1565,7 @@ def _new_connection_file(self):
         if not osp.isdir(jupyter_runtime_dir()):
             try:
                 os.makedirs(jupyter_runtime_dir())
-            except PermissionError:
+            except (IOError, OSError):
                 return None
         cf = ''
         while not cf:

spyder/plugins/tests/test_ipythonconsole.py

@@ -26,6 +26,7 @@
                                            KernelConnectionDialog)
 from spyder.utils.environ import listdict2envdict
 from spyder.utils.ipython.style import create_style_class
+from spyder.utils.programs import TEMPDIR
 from spyder.utils.test import close_message_box
 from spyder.widgets.variableexplorer.collectionseditor import CollectionsEditor
 
@@ -36,6 +37,7 @@
 SHELL_TIMEOUT = 20000
 PYQT_WHEEL = PYQT_VERSION > '5.6'
 TEMP_DIRECTORY = tempfile.gettempdir()
+NON_ASCII_DIR = osp.join(TEMP_DIRECTORY, u'測試', u'اختبار')
 
 
 #==============================================================================
@@ -64,41 +66,74 @@ def get_console_background_color(style_sheet):
 #==============================================================================
 @pytest.fixture
 def ipyconsole(request):
-    try:
-        console = IPythonConsole(None, testing=True, test_dir=request.param)
-    except AttributeError:
-        console = IPythonConsole(None, testing=True)
+    """IPython console fixture."""
+
+    # Test the console with a non-ascii temp dir
+    non_ascii_dir = request.node.get_marker('non_ascii_dir')
+    if non_ascii_dir:
+        test_dir = NON_ASCII_DIR
+    else:
+        test_dir = TEMPDIR
+
+    # Instruct the console to not use a stderr file
+    no_stderr_file = request.node.get_marker('no_stderr_file')
+    if no_stderr_file:
+        test_no_stderr = True
+    else:
+        test_no_stderr = False
+
+    # Create the console and a new client
+    console = IPythonConsole(parent=None,
+                             testing=True,
+                             test_dir=test_dir,
+                             test_no_stderr=test_no_stderr)
     console.create_new_client()
+
     def close_console():
         console.closing_plugin()
         console.close()
     request.addfinalizer(close_console)
     console.show()
+
     return console
 
 
 #==============================================================================
 # Tests
 #==============================================================================
-@pytest.mark.parametrize('ipyconsole', [osp.join(TEMP_DIRECTORY, u'測試',
-                                                 u'اختبار')], indirect=True)
+@flaky(max_runs=3)
 @pytest.mark.skipif(os.name == 'nt', reason="It times out sometimes on Windows")
-def test_console_stderr_file(ipyconsole, qtbot):
-    """Test a the creation of a console with a stderr file in ascii dir."""
+@pytest.mark.no_stderr_file
+def test_no_stderr_file(ipyconsole, qtbot):
+    """Test that consoles can run without an stderr."""
     # Wait until the window is fully up
     shell = ipyconsole.get_current_shellwidget()
     qtbot.waitUntil(lambda: shell._prompt_html is not None,
                     timeout=SHELL_TIMEOUT)
 
-    # Create a new client with s stderr file in a non-ascii dir
-    ipyconsole.create_new_client()
+    # Execute a simple assignment
+    with qtbot.waitSignal(shell.executed):
+        shell.execute('a = 1')
+
+    # Assert we get the assigned value correctly
+    assert shell.get_value('a') == 1
+
+
+@flaky(max_runs=3)
+@pytest.mark.skipif(os.name == 'nt', reason="It times out sometimes on Windows")
+@pytest.mark.non_ascii_dir
+def test_non_ascii_stderr_file(ipyconsole, qtbot):
+    """Test the creation of a console with a stderr file in a non-ascii dir."""
+    # Wait until the window is fully up
     shell = ipyconsole.get_current_shellwidget()
     qtbot.waitUntil(lambda: shell._prompt_html is not None,
                     timeout=SHELL_TIMEOUT)
+
+    # Execute a simple assignment
     with qtbot.waitSignal(shell.executed):
         shell.execute('a = 1')
 
-    # Assert we get the a value correctly
+    # Assert we get the assigned value
     assert shell.get_value('a') == 1
 
 
@@ -531,7 +566,7 @@ def test_restart_kernel(ipyconsole, qtbot):
     client = ipyconsole.get_current_client()
     qtbot.waitUntil(lambda: shell._prompt_html is not None, timeout=SHELL_TIMEOUT)
 
-    # Do an assigment to verify that it's not there after restarting
+    # Do an assignment to verify that it's not there after restarting
     with qtbot.waitSignal(shell.executed):
         shell.execute('a = 10')
 

spyder/widgets/ipythonconsole/client.py

@@ -156,15 +156,19 @@ def kernel_id(self):
     @property
     def stderr_file(self):
         """Filename to save kernel stderr output."""
+        stderr_file = None
         if self.connection_file is not None:
             stderr_file = self.kernel_id + '.stderr'
             if self.stderr_dir is not None:
                 stderr_file = osp.join(self.stderr_dir, stderr_file)
             else:
-                if not osp.isdir(TEMPDIR):
-                    os.makedirs(TEMPDIR)
-                stderr_file = osp.join(TEMPDIR, stderr_file)
-            return stderr_file
+                try:
+                    if not osp.isdir(TEMPDIR):
+                        os.makedirs(TEMPDIR)
+                    stderr_file = osp.join(TEMPDIR, stderr_file)
+                except (IOError, OSError):
+                    stderr_file = None
+        return stderr_file
 
     def configure_shellwidget(self, give_focus=True):
         """Configure shellwidget after kernel is started"""