Replace filter() calls with list comprehensions

In Python 3, filter() returns an iterator.
Use list comprehensions instead.

Reviewed-By: Christian Heimes <cheimes@redhat.com>
Reviewed-By: Jan Cholasta <jcholast@redhat.com>

ipalib/frontend.py

@@ -1128,7 +1128,7 @@ class Object(HasParam):
             self.__get_attrs('Method'), sort=False, name_attr='attr_name'
         )
         self._create_param_namespace('params')
-        pkeys = filter(lambda p: p.primary_key, self.params())
+        pkeys = [p for p in self.params() if p.primary_key]
         if len(pkeys) > 1:
             raise ValueError(
                 '%s (Object) has multiple primary keys: %s' % (
@@ -1139,7 +1139,7 @@ class Object(HasParam):
         if len(pkeys) == 1:
             self.primary_key = pkeys[0]
             self.params_minus_pk = NameSpace(
-                filter(lambda p: not p.primary_key, self.params()), sort=False
+                [p for p in self.params() if not p.primary_key], sort=False
             )
         else:
             self.primary_key = None

ipalib/parameters.py

@@ -792,9 +792,8 @@ class Param(ReadOnly):
             if type(value) not in (tuple, list):
                 value = (value,)
             values = tuple(
-                self._convert_scalar(v, i) for (i, v) in filter(
-                    lambda iv: not _is_null(iv[1]), enumerate(value)
-                )
+                self._convert_scalar(v, i)
+                for (i, v) in enumerate(value) if not _is_null(v)
             )
             if len(values) == 0:
                 return