Fixed linting issues.

.travis.yml

@@ -20,11 +20,6 @@ matrix:
   - env: BUILD_NAME=py35-docs
     python: '3.5'
 
-  - env: BUILD_NAME=py27-license
-    python: '2.7'
-  - env: BUILD_NAME=py35-license
-    python: '3.5'
-
   # Python 2.7 with ghdl mcode
   - env: BUILD_NAME=py27-acceptance-ghdl
     python: '2.7'

vunit/simulator_interface.py

@@ -64,7 +64,11 @@ def find_executable(executable):
         return result
 
     @staticmethod
-    def _get_local_vhdl_assert_stop_level(config, mapping=dict(warning="warning", error="error", failure="failure")):
+    def _get_local_vhdl_assert_stop_level(config, mapping=None):
+        """
+        Return the VHDL assert stop level to use with the simulator
+        """
+        mapping = mapping if mapping is not None else dict(warning="warning", error="error", failure="failure")
         if "vhdl_assert_stop_level" in config.options:
             if config.options.get("vhdl_assert_stop_level") not in mapping:
                 raise RuntimeError("Unknown vhdl_assert_stop_level: %s" % config.options.get("vhdl_assert_stop_level"))

vunit/test/acceptance/artificial/vhdl/run.py

@@ -64,6 +64,7 @@ def configure_tb_set_generic(ui):
     tb.set_generic("str_space_val", "1 2 3")
     tb.set_generic("str_quote_val", 'a"b')
 
+
 def configure_tb_assert_stop_level(ui):
     tb = ui.library("lib").entity("tb_assert_stop_level")