Style fixes

Author: Vasileios Karakasis

reframe/core/modules.py

@@ -215,7 +215,6 @@ def execute(self, cmd, *args):
         '''
         return self._backend.execute(cmd, *args)
 
-
     def load_module(self, name, force=False, collection=False):
         '''Load the module ``name``.
 
@@ -402,16 +401,14 @@ def execute(self, cmd, *args):
         try:
             exec_output = self._execute(cmd, *args)
         except SpawnedProcessError as e:
-            raise EnvironError from e
+            raise EnvironError('could not execute module operation') from e
 
         return exec_output
 
-
     @abc.abstractmethod
     def _execute(self, cmd, *args):
         '''Execute an arbitrary command of the module system.'''
 
-
     @abc.abstractmethod
     def available_modules(self, substr):
         '''Return a list of available modules, whose name contains ``substr``.

unittests/test_environments.py

@@ -10,7 +10,7 @@
 import reframe.core.environments as env
 import reframe.core.runtime as rt
 import unittests.fixtures as fixtures
-from reframe.core.exceptions import (EnvironError, SpawnedProcessError)
+from reframe.core.exceptions import EnvironError
 
 
 @pytest.fixture

unittests/test_modules.py

@@ -12,9 +12,7 @@
 import reframe.utility as util
 import reframe.utility.osext as osext
 import unittests.fixtures as fixtures
-from reframe.core.exceptions import (ConfigError,
-                                     EnvironError,
-                                     SpawnedProcessError)
+from reframe.core.exceptions import (ConfigError, EnvironError)
 from reframe.core.runtime import runtime