[code] Code cleanup

beat/core/plotter.py

@@ -44,6 +44,7 @@ Validation for plotters
 
 import os
 import six
+import sys
 
 from . import dataformat
 from . import algorithm
@@ -227,7 +228,7 @@ class Plotter(object):
         # At this point, `data' can be a dictionary or ``None``
         if data is None:  # loads the default declaration for an algorithm
             self.data, self.errors = prototypes.load("plotter")
-            assert not self.errors, "\n  * %s" % "\n  *".join(self.errors)
+            assert not self.errors, "\n  * %s" % "\n  *".join(self.errors)  # nosec
         else:  # just assign it
             # this runs basic validation, including JSON loading if required
             self.data, self.errors = schema.validate("plotter", data)
@@ -400,7 +401,7 @@ class Plotter(object):
                     self.uses_dict(),
                 ),
             )
-        except Exception as e:
+        except Exception:
             if exc is not None:
                 type, value, traceback = sys.exc_info()
                 six.reraise(exc, exc(value), traceback)