diff --git a/python/plugins/processing/algs/qgis/Aspect.py b/python/plugins/processing/algs/qgis/Aspect.py
index 6ffb53e17df..540014f2216 100644
--- a/python/plugins/processing/algs/qgis/Aspect.py
+++ b/python/plugins/processing/algs/qgis/Aspect.py
@@ -32,13 +32,8 @@ from qgis.PyQt.QtGui import QIcon
 from qgis.analysis import QgsAspectFilter
 from qgis.core import (QgsProcessingParameterRasterLayer,
                        QgsProcessingParameterNumber,
-                       QgsProcessingParameterRasterDestination,
-                       QgsProcessingOutputRasterLayer,
-                       QgsFeatureSink)
+                       QgsProcessingParameterRasterDestination)
 from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm
-from processing.core.parameters import ParameterRaster
-from processing.core.parameters import ParameterNumber
-from processing.core.outputs import OutputRaster
 from processing.tools import raster
 from processing.tools.dataobjects import exportRasterLayer
 
diff --git a/python/plugins/processing/algs/qgis/BasicStatistics.py b/python/plugins/processing/algs/qgis/BasicStatistics.py
index fa754e72da5..c6a96bebd37 100644
--- a/python/plugins/processing/algs/qgis/BasicStatistics.py
+++ b/python/plugins/processing/algs/qgis/BasicStatistics.py
@@ -32,11 +32,9 @@ from qgis.PyQt.QtCore import QVariant
 from qgis.PyQt.QtGui import QIcon
 
 from qgis.core import (QgsStatisticalSummary,
-                       QgsFeatureSink,
                        QgsStringStatisticalSummary,
                        QgsDateTimeStatisticalSummary,
                        QgsFeatureRequest,
-                       QgsProcessingUtils,
                        QgsProcessingParameterFeatureSource,
                        QgsProcessingParameterField,
                        QgsProcessingParameterFileDestination,
diff --git a/python/plugins/processing/algs/qgis/ConcaveHull.py b/python/plugins/processing/algs/qgis/ConcaveHull.py
index 4f5a35e31ce..2d5f1503756 100644
--- a/python/plugins/processing/algs/qgis/ConcaveHull.py
+++ b/python/plugins/processing/algs/qgis/ConcaveHull.py
@@ -26,9 +26,7 @@ __copyright__ = '(C) 2014, Piotr Pociask'
 
 __revision__ = '$Format:%H$'
 
-from qgis.core import (QgsFeatureRequest,
-                       QgsFeature,
-                       QgsGeometry,
+from qgis.core import (QgsFeature,
                        QgsFeatureSink,
                        QgsWkbTypes,
                        QgsProcessing,
diff --git a/python/plugins/processing/algs/qgis/CreateAttributeIndex.py b/python/plugins/processing/algs/qgis/CreateAttributeIndex.py
index 59c01497c3d..f4694852950 100644
--- a/python/plugins/processing/algs/qgis/CreateAttributeIndex.py
+++ b/python/plugins/processing/algs/qgis/CreateAttributeIndex.py
@@ -29,7 +29,6 @@ from qgis.core import (QgsVectorDataProvider,
                        QgsFields,
                        QgsProcessingParameterVectorLayer,
                        QgsProcessingParameterField,
-                       QgsProcessingParameterDefinition,
                        QgsProcessingOutputVectorLayer)
 
 from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm
diff --git a/python/plugins/processing/algs/qgis/ImportIntoPostGIS.py b/python/plugins/processing/algs/qgis/ImportIntoPostGIS.py
index a5fb38003e3..9f01ca4ea20 100644
--- a/python/plugins/processing/algs/qgis/ImportIntoPostGIS.py
+++ b/python/plugins/processing/algs/qgis/ImportIntoPostGIS.py
@@ -27,9 +27,7 @@ __revision__ = '$Format:%H$'
 
 from qgis.core import (QgsVectorLayerExporter,
                        QgsSettings,
-                       QgsApplication,
                        QgsFeatureSink,
-                       QgsProcessingUtils,
                        QgsProcessingParameterFeatureSource,
                        QgsProcessingParameterString,
                        QgsProcessingParameterField,
diff --git a/python/plugins/processing/algs/qgis/PostGISExecuteSQL.py b/python/plugins/processing/algs/qgis/PostGISExecuteSQL.py
index 795b9ff0777..0d3fbadef93 100644
--- a/python/plugins/processing/algs/qgis/PostGISExecuteSQL.py
+++ b/python/plugins/processing/algs/qgis/PostGISExecuteSQL.py
@@ -26,8 +26,7 @@ __copyright__ = '(C) 2012, Victor Olaya, Carterix Geomatics'
 
 __revision__ = '$Format:%H$'
 
-from qgis.core import (QgsApplication,
-                       QgsProcessingParameterString)
+from qgis.core import (QgsProcessingParameterString)
 from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm
 from processing.core.GeoAlgorithmExecutionException import GeoAlgorithmExecutionException
 from processing.tools import postgis
diff --git a/python/plugins/processing/algs/qgis/SelectByAttribute.py b/python/plugins/processing/algs/qgis/SelectByAttribute.py
index 46e97d0019c..8442355bb3f 100644
--- a/python/plugins/processing/algs/qgis/SelectByAttribute.py
+++ b/python/plugins/processing/algs/qgis/SelectByAttribute.py
@@ -25,10 +25,8 @@ __copyright__ = '(C) 2010, Michael Minn'
 
 __revision__ = '$Format:%H$'
 
-from qgis.core import (QgsApplication)
 from qgis.PyQt.QtCore import QVariant
 from qgis.core import (QgsExpression,
-                       QgsProcessingUtils,
                        QgsProcessingParameterVectorLayer,
                        QgsProcessingParameterField,
                        QgsProcessingParameterEnum,
diff --git a/python/plugins/processing/algs/qgis/SimplifyGeometries.py b/python/plugins/processing/algs/qgis/SimplifyGeometries.py
index ec016e57c18..1507bfbbf87 100644
--- a/python/plugins/processing/algs/qgis/SimplifyGeometries.py
+++ b/python/plugins/processing/algs/qgis/SimplifyGeometries.py
@@ -32,13 +32,13 @@ from qgis.PyQt.QtGui import QIcon
 from qgis.core import (QgsMapToPixelSimplifier,
                        QgsMessageLog,
                        QgsFeatureSink,
+                       QgsProcessing,
                        QgsProcessingParameterFeatureSource,
                        QgsProcessingParameterFeatureSink,
                        QgsProcessingParameterEnum,
                        QgsProcessingParameterNumber)
 
 from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm
-from processing.tools import dataobjects
 
 pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0]
 
@@ -62,7 +62,7 @@ class SimplifyGeometries(QgisAlgorithm):
     def initAlgorithm(self, config=None):
         self.addParameter(QgsProcessingParameterFeatureSource(self.INPUT,
                                                               self.tr('Input layer'),
-                                                              [dataobjects.TYPE_VECTOR_POLYGON, dataobjects.TYPE_VECTOR_LINE]))
+                                                              [QgsProcessing.TypeVectorPolygon, QgsProcessing.TypeVectorLine]))
         self.methods = [self.tr('Distance (Douglas-Peucker)'),
                         'Snap to grid',
                         'Area (Visvalingam)']
diff --git a/python/plugins/processing/algs/qgis/Smooth.py b/python/plugins/processing/algs/qgis/Smooth.py
index 624c74f8102..f9b8e8238a3 100644
--- a/python/plugins/processing/algs/qgis/Smooth.py
+++ b/python/plugins/processing/algs/qgis/Smooth.py
@@ -26,13 +26,13 @@ __copyright__ = '(C) 2015, Nyall Dawson'
 __revision__ = '$Format:%H$'
 
 from qgis.core import (QgsFeatureSink,
+                       QgsProcessing,
                        QgsProcessingParameterFeatureSource,
                        QgsProcessingParameterFeatureSink,
                        QgsProcessingParameterNumber)
 
 from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm
 from processing.core.GeoAlgorithmExecutionException import GeoAlgorithmExecutionException
-from processing.tools import dataobjects
 
 
 class Smooth(QgisAlgorithm):
@@ -51,7 +51,7 @@ class Smooth(QgisAlgorithm):
 
     def initAlgorithm(self, config=None):
         self.addParameter(QgsProcessingParameterFeatureSource(self.INPUT,
-                                                              self.tr('Input layer'), [dataobjects.TYPE_VECTOR_POLYGON, dataobjects.TYPE_VECTOR_LINE]))
+                                                              self.tr('Input layer'), [QgsProcessing.TypeVectorPolygon, QgsProcessing.TypeVectorLine]))
         self.addParameter(QgsProcessingParameterNumber(self.ITERATIONS,
                                                        self.tr('Iterations'),
                                                        defaultValue=1, minValue=1, maxValue=10))
diff --git a/python/plugins/processing/algs/qgis/SpatialiteExecuteSQL.py b/python/plugins/processing/algs/qgis/SpatialiteExecuteSQL.py
index c303c3c6912..664ebab8036 100644
--- a/python/plugins/processing/algs/qgis/SpatialiteExecuteSQL.py
+++ b/python/plugins/processing/algs/qgis/SpatialiteExecuteSQL.py
@@ -27,7 +27,6 @@ __copyright__ = '(C) 2016, Mathieu Pellerin'
 __revision__ = '$Format:%H$'
 
 from qgis.core import (QgsDataSourceUri,
-                       QgsApplication,
                        QgsProcessingParameterVectorLayer,
                        QgsProcessingParameterString)