Use dict comprehension in plugins (#8814)

* use dict comprehension in plugins

* Apply suggestions from code review

* add changelog frag

* fix references in changelog frag

plugins/module_utils/csv.py

@@ -43,7 +43,7 @@ def initialize_dialect(dialect, **kwargs):
         raise DialectNotAvailableError("Dialect '%s' is not supported by your version of python." % dialect)
 
     # Create a dictionary from only set options
-    dialect_params = dict((k, v) for k, v in kwargs.items() if v is not None)
+    dialect_params = {k: v for k, v in kwargs.items() if v is not None}
     if dialect_params:
         try:
             csv.register_dialect('custom', dialect, **dialect_params)

plugins/module_utils/mh/mixins/vars.py

@@ -113,7 +113,7 @@ class VarDict(object):
         self._meta[name] = meta
 
     def output(self):
-        return dict((k, v) for k, v in self._data.items() if self.meta(k).output)
+        return {k: v for k, v in self._data.items() if self.meta(k).output}
 
     def diff(self):
         diff_results = [(k, self.meta(k).diff_result) for k in self._data]
@@ -125,7 +125,7 @@ class VarDict(object):
         return None
 
     def facts(self):
-        facts_result = dict((k, v) for k, v in self._data.items() if self._meta[k].fact)
+        facts_result = {k: v for k, v in self._data.items() if self._meta[k].fact}
         return facts_result if facts_result else None
 
     def change_vars(self):

plugins/module_utils/vardict.py

@@ -175,18 +175,18 @@ class VarDict(object):
         self.__vars__[name] = var
 
     def output(self, verbosity=0):
-        return dict((n, v.value) for n, v in self.__vars__.items() if v.output and v.is_visible(verbosity))
+        return {n: v.value for n, v in self.__vars__.items() if v.output and v.is_visible(verbosity)}
 
     def diff(self, verbosity=0):
         diff_results = [(n, v.diff_result) for n, v in self.__vars__.items() if v.diff_result and v.is_visible(verbosity)]
         if diff_results:
-            before = dict((n, dr['before']) for n, dr in diff_results)
-            after = dict((n, dr['after']) for n, dr in diff_results)
+            before = {n: dr['before'] for n, dr in diff_results}
+            after = {n: dr['after'] for n, dr in diff_results}
             return {'before': before, 'after': after}
         return None
 
     def facts(self, verbosity=0):
-        facts_result = dict((n, v.value) for n, v in self.__vars__.items() if v.fact and v.is_visible(verbosity))
+        facts_result = {n: v.value for n, v in self.__vars__.items() if v.fact and v.is_visible(verbosity)}
         return facts_result if facts_result else None
 
     @property
@@ -194,4 +194,4 @@ class VarDict(object):
         return any(var.has_changed for var in self.__vars__.values())
 
     def as_dict(self):
-        return dict((name, var.value) for name, var in self.__vars__.items())
+        return {name: var.value for name, var in self.__vars__.items()}