diff --git a/src/Mod/BIM/nativeifc/ifc_commands.py b/src/Mod/BIM/nativeifc/ifc_commands.py
index 25591cdc01..c27a0aca35 100644
--- a/src/Mod/BIM/nativeifc/ifc_commands.py
+++ b/src/Mod/BIM/nativeifc/ifc_commands.py
@@ -22,9 +22,9 @@
 
 """This module contains IFC-related FreeCAD commands"""
 
-
 import FreeCAD
 import FreeCADGui
+
 from . import ifc_openshell
 
 translate = FreeCAD.Qt.translate
@@ -155,7 +155,7 @@ class IFC_MakeProject:
     def Activated(self):
         from importers import exportIFC  # lazy loading
         from . import ifc_tools
-        from PySide import QtCore, QtGui
+        from PySide import QtGui
 
         doc = FreeCAD.ActiveDocument
         objs = FreeCADGui.Selection.getSelection()
diff --git a/src/Mod/BIM/nativeifc/ifc_diff.py b/src/Mod/BIM/nativeifc/ifc_diff.py
index 43cf4822be..4200903ead 100644
--- a/src/Mod/BIM/nativeifc/ifc_diff.py
+++ b/src/Mod/BIM/nativeifc/ifc_diff.py
@@ -23,12 +23,15 @@
 """Diffing tool for NativeIFC project objects"""
 
 import difflib
+
+import ifcopenshell
+
 import FreeCAD
 import FreeCADGui
-import ifcopenshell
-from . import ifc_tools
 import Arch_rc
 
+from . import ifc_tools
+
 translate = FreeCAD.Qt.translate
 
 
diff --git a/src/Mod/BIM/nativeifc/ifc_export.py b/src/Mod/BIM/nativeifc/ifc_export.py
index 91001de2df..4f26ccd32d 100644
--- a/src/Mod/BIM/nativeifc/ifc_export.py
+++ b/src/Mod/BIM/nativeifc/ifc_export.py
@@ -22,9 +22,10 @@
 
 import tempfile
 
+import ifcopenshell
+
 import FreeCAD
 import Draft
-import ifcopenshell
 
 from importers import exportIFC
 from importers import exportIFCHelper
diff --git a/src/Mod/BIM/nativeifc/ifc_generator.py b/src/Mod/BIM/nativeifc/ifc_generator.py
index 4c01bf2501..5242f575ef 100644
--- a/src/Mod/BIM/nativeifc/ifc_generator.py
+++ b/src/Mod/BIM/nativeifc/ifc_generator.py
@@ -24,25 +24,24 @@
 The only entry point in this module is the generate_geometry() function which is
 used by the execute() method of ifc_objects"""
 
-
+import multiprocessing
 import re
-import FreeCAD
-from FreeCAD import Base
-import Part
 
 import ifcopenshell
 import ifcopenshell.util.element
-
-import multiprocessing
-
-import FreeCADGui
-
 from pivy import coin
 from PySide import QtCore
 
+import FreeCAD
+import FreeCADGui
+import Part
+
+from FreeCAD import Base
+
 from . import ifc_tools
 from . import ifc_export
 
+
 def generate_geometry(obj, cached=False):
     """Sets the geometry of the given object from a corresponding IFC element.
     This is the main function called by the execute method of FreeCAD document objects
diff --git a/src/Mod/BIM/nativeifc/ifc_geometry.py b/src/Mod/BIM/nativeifc/ifc_geometry.py
index 1cdda68be9..e3d6701c68 100644
--- a/src/Mod/BIM/nativeifc/ifc_geometry.py
+++ b/src/Mod/BIM/nativeifc/ifc_geometry.py
@@ -22,11 +22,11 @@
 
 """This module contains geometry editing and geometry properties-related tools"""
 
-import FreeCAD
-
 import ifcopenshell
 import ifcopenshell.util.unit
 
+import FreeCAD
+
 from . import ifc_tools
 
 
diff --git a/src/Mod/BIM/nativeifc/ifc_layers.py b/src/Mod/BIM/nativeifc/ifc_layers.py
index f4fa9ab0dc..d5b5b61b1e 100644
--- a/src/Mod/BIM/nativeifc/ifc_layers.py
+++ b/src/Mod/BIM/nativeifc/ifc_layers.py
@@ -22,12 +22,12 @@
 
 """This NativeIFC module deals with layers"""
 
-
 import ifcopenshell
 import ifcopenshell.util.element
 
 from . import ifc_tools
 
+
 def load_layers(obj):
     """Loads all the layers of an IFC file"""
 
diff --git a/src/Mod/BIM/nativeifc/ifc_materials.py b/src/Mod/BIM/nativeifc/ifc_materials.py
index e925116a26..4e0ad54d26 100644
--- a/src/Mod/BIM/nativeifc/ifc_materials.py
+++ b/src/Mod/BIM/nativeifc/ifc_materials.py
@@ -22,13 +22,14 @@
 
 """This NativeIFC module deals with materials"""
 
-import FreeCAD
-
 import ifcopenshell
 import ifcopenshell.util.element
 
+import FreeCAD
+
 from . import ifc_tools
 
+
 def create_material(element, parent, recursive=False):
     """Creates a material object in the given project or parent material"""
 
diff --git a/src/Mod/BIM/nativeifc/ifc_objects.py b/src/Mod/BIM/nativeifc/ifc_objects.py
index c3350dab3e..079574bec1 100644
--- a/src/Mod/BIM/nativeifc/ifc_objects.py
+++ b/src/Mod/BIM/nativeifc/ifc_objects.py
@@ -24,12 +24,15 @@
 
 import FreeCAD
 import FreeCADGui
+
 translate = FreeCAD.Qt.translate
 
+
 # the property groups below should not be treated as psets
 NON_PSETS = ["Base", "IFC", "", "Geometry", "Dimension", "Linear/radial dimension",
              "SectionPlane", "Axis", "PhysicalProperties", "BuildingPart", "IFC Attributes"]
 
+
 class ifc_object:
     """Base class for all IFC-based objects"""
 
diff --git a/src/Mod/BIM/nativeifc/ifc_observer.py b/src/Mod/BIM/nativeifc/ifc_observer.py
index f650c91101..66097658ec 100644
--- a/src/Mod/BIM/nativeifc/ifc_observer.py
+++ b/src/Mod/BIM/nativeifc/ifc_observer.py
@@ -22,9 +22,9 @@
 
 """Document observer to act on documents containing NativeIFC objects"""
 
-
 import FreeCAD
 
+
 params = FreeCAD.ParamGet("User parameter:BaseApp/Preferences/Mod/NativeIFC")
 
 
diff --git a/src/Mod/BIM/nativeifc/ifc_openshell.py b/src/Mod/BIM/nativeifc/ifc_openshell.py
index f38b866ee4..747dd3f01c 100644
--- a/src/Mod/BIM/nativeifc/ifc_openshell.py
+++ b/src/Mod/BIM/nativeifc/ifc_openshell.py
@@ -24,9 +24,10 @@
 
 """Utilities to help people verify and update their version of ifcopenshell"""
 
+from packaging.version import Version
+
 import FreeCAD
 import FreeCADGui
-from packaging.version import Version
 from addonmanager_utilities import create_pip_call
 
 translate = FreeCAD.Qt.translate
@@ -139,7 +140,7 @@ class IFC_UpdateIOS:
 
         try:
             import ifcopenshell
-            version = ifcopenshell.version           
+            version = ifcopenshell.version
             try:
                 Version(version)
             except InvalidVersion:
diff --git a/src/Mod/BIM/nativeifc/ifc_performance_test.py b/src/Mod/BIM/nativeifc/ifc_performance_test.py
index 7fb7740cd1..8687751ba0 100644
--- a/src/Mod/BIM/nativeifc/ifc_performance_test.py
+++ b/src/Mod/BIM/nativeifc/ifc_performance_test.py
@@ -22,8 +22,10 @@
 
 import os
 import time
-import FreeCAD
 import unittest
+
+import FreeCAD
+
 from . import ifc_import
 
 
diff --git a/src/Mod/BIM/nativeifc/ifc_psets.py b/src/Mod/BIM/nativeifc/ifc_psets.py
index bc4d993690..c6ebb74462 100644
--- a/src/Mod/BIM/nativeifc/ifc_psets.py
+++ b/src/Mod/BIM/nativeifc/ifc_psets.py
@@ -22,7 +22,6 @@
 
 """This NativeIFC module deals with properties and property sets"""
 
-
 import os
 import re
 
diff --git a/src/Mod/BIM/nativeifc/ifc_selftest.py b/src/Mod/BIM/nativeifc/ifc_selftest.py
index 25300dd909..fa016529ca 100644
--- a/src/Mod/BIM/nativeifc/ifc_selftest.py
+++ b/src/Mod/BIM/nativeifc/ifc_selftest.py
@@ -22,13 +22,18 @@
 
 """Unit test for the Native IFC module"""
 
+import difflib
 import os
-import time
 import tempfile
-import FreeCAD
-import Draft
-import Arch
 import unittest
+
+import ifcopenshell
+from ifcopenshell.util import element
+
+import FreeCAD
+import Arch
+import Draft
+
 from . import ifc_import
 from . import ifc_tools
 from . import ifc_geometry
@@ -37,9 +42,7 @@ from . import ifc_layers
 from . import ifc_psets
 from . import ifc_objects
 from . import ifc_generator
-import ifcopenshell
-from ifcopenshell.util import element
-import difflib
+
 
 IFC_FILE_PATH = None  # downloaded IFC file path
 FCSTD_FILE_PATH = None  # saved FreeCAD file
diff --git a/src/Mod/BIM/nativeifc/ifc_status.py b/src/Mod/BIM/nativeifc/ifc_status.py
index a75375b509..1cf88936e8 100644
--- a/src/Mod/BIM/nativeifc/ifc_status.py
+++ b/src/Mod/BIM/nativeifc/ifc_status.py
@@ -23,13 +23,12 @@
 
 """This contains nativeifc status widgets and functionality"""
 
-
-import os
 import csv
+import os
+
 import FreeCAD
 import FreeCADGui
 
-
 translate = FreeCAD.Qt.translate
 params = FreeCAD.ParamGet("User parameter:BaseApp/Preferences/Mod/NativeIFC")
 text_on = translate("BIM", "Strict IFC mode is ON (all objects are IFC)")
@@ -100,7 +99,7 @@ def on_add_property():
     sel = FreeCADGui.Selection.getSelection()
     if not sel:
         return
-    from PySide import QtCore, QtGui  # lazy loading
+    from PySide import QtGui  # lazy loading
     from . import ifc_psets
     obj = sel[0]
     psets = list(set([obj.getGroupOfProperty(p) for p in obj.PropertiesList]))
@@ -179,7 +178,6 @@ def on_add_pset():
     sel = FreeCADGui.Selection.getSelection()
     if not sel:
         return
-    from PySide import QtCore, QtGui  # lazy loading
     from . import ifc_psets
     obj = sel[0]
     mw = FreeCADGui.getMainWindow()
@@ -273,7 +271,7 @@ def on_new():
 def set_menu(locked=False):
     """Sets the File menu items"""
 
-    from PySide import QtCore, QtGui  # lazy loading
+    from PySide import QtGui  # lazy loading
 
     # switch Std_Save and IFC_Save
     mw = FreeCADGui.getMainWindow()
@@ -452,7 +450,6 @@ def lock_document():
 def find_toplevel(objs):
     """Finds the top-level objects from the list"""
 
-    import Draft
     # filter out any object that depend on another from the list
     nobjs = []
     for obj in objs:
@@ -474,6 +471,8 @@ def find_toplevel(objs):
 def filter_out(objs):
     """Filter out objects that should not be converted to IFC"""
 
+    import Draft
+
     nobjs = []
     for obj in objs:
         if obj.isDerivedFrom("Part::Feature"):
diff --git a/src/Mod/BIM/nativeifc/ifc_tools.py b/src/Mod/BIM/nativeifc/ifc_tools.py
index 3330f6e007..2d12a29a07 100644
--- a/src/Mod/BIM/nativeifc/ifc_tools.py
+++ b/src/Mod/BIM/nativeifc/ifc_tools.py
@@ -23,9 +23,15 @@
 """This is the main NativeIFC module"""
 
 import os
+
+from PySide import QtCore
+
 import FreeCAD
-import Draft
 import Arch
+import ArchBuildingPart
+import Draft
+
+from draftviewproviders import view_layer
 
 translate = FreeCAD.Qt.translate
 
@@ -59,10 +65,6 @@ from . import ifc_status
 from . import ifc_export
 from . import ifc_psets
 
-from draftviewproviders import view_layer
-import ArchBuildingPart
-from PySide import QtCore
-
 SCALE = 1000.0  # IfcOpenShell works in meters, FreeCAD works in mm
 SHORT = False  # If True, only Step ID attribute is created
 ROUND = 8  # rounding value for placements
diff --git a/src/Mod/BIM/nativeifc/ifc_tree.py b/src/Mod/BIM/nativeifc/ifc_tree.py
index 334e3e1931..8e7f4455e0 100644
--- a/src/Mod/BIM/nativeifc/ifc_tree.py
+++ b/src/Mod/BIM/nativeifc/ifc_tree.py
@@ -22,7 +22,6 @@
 
 """This NativeIFC module handles the retrieval and display of geometry compositions of objects"""
 
-
 import FreeCAD
 
 TAB = 2
@@ -80,7 +79,7 @@ def show_geometry_tree(element):
     import Arch_rc
     import FreeCADGui  # lazy import
     from . import ifc_tools
-    from PySide import QtGui, QtWidgets
+    from PySide import QtWidgets
 
     if isinstance(element, FreeCAD.DocumentObject):
         element = ifc_tools.get_ifc_element(element)
@@ -147,7 +146,7 @@ def show_properties(current, previous):
 
     import FreeCADGui
     from . import ifc_tools  # lazy loading
-    from PySide import QtCore, QtGui, QtWidgets
+    from PySide import QtCore, QtWidgets
 
     ifcid = int(current.text(0).split("=", 1)[0].strip(" ").strip("#"))
     sel = FreeCADGui.Selection.getSelection()
diff --git a/src/Mod/BIM/nativeifc/ifc_types.py b/src/Mod/BIM/nativeifc/ifc_types.py
index 295d3cc8dd..5ec97cdf13 100644
--- a/src/Mod/BIM/nativeifc/ifc_types.py
+++ b/src/Mod/BIM/nativeifc/ifc_types.py
@@ -22,8 +22,8 @@
 
 """Diffing tool for NativeIFC project objects"""
 
-
 import FreeCAD
+
 from . import ifc_tools
 
 translate = FreeCAD.Qt.translate
diff --git a/src/Mod/BIM/nativeifc/ifc_viewproviders.py b/src/Mod/BIM/nativeifc/ifc_viewproviders.py
index 13f0c6bd43..0ef818f3c5 100644
--- a/src/Mod/BIM/nativeifc/ifc_viewproviders.py
+++ b/src/Mod/BIM/nativeifc/ifc_viewproviders.py
@@ -86,7 +86,7 @@ class ifc_vp_object:
         from . import ifc_psets
         from . import ifc_materials
         from . import ifc_types
-        from PySide import QtCore, QtGui  # lazy import
+        from PySide import QtGui  # lazy import
 
         if FreeCADGui.activeWorkbench().name() != 'BIMWorkbench':
             return
@@ -419,7 +419,7 @@ class ifc_vp_document(ifc_vp_object):
 
     def setupContextMenu(self, vobj, menu):
 
-        from PySide import QtCore, QtGui  # lazy import
+        from PySide import QtGui  # lazy import
 
         if FreeCADGui.activeWorkbench().name() != 'BIMWorkbench':
             return
@@ -463,7 +463,7 @@ class ifc_vp_document(ifc_vp_object):
     def replace_file(self, obj, newfile):
         """Asks the user if the attached file path needs to be replaced"""
 
-        from PySide import QtCore, QtGui  # lazy import
+        from PySide import QtGui  # lazy import
 
         msg = "Replace the stored IFC file path in object "
         msg += self.Object.Label + " with the new one: "
@@ -484,7 +484,7 @@ class ifc_vp_document(ifc_vp_object):
             return False
 
     def schema_warning(self):
-        from PySide import QtCore, QtGui  # lazy import
+        from PySide import QtGui  # lazy import
 
         msg = "Warning: This operation will change the whole IFC file contents "
         msg += "and will not give versionable results. It is best to not do "
@@ -516,7 +516,7 @@ class ifc_vp_group:
         self.Object = vobj.Object
 
     def getIcon(self):
-        from PySide import QtCore, QtGui  # lazy loading
+        from PySide import QtGui  # lazy loading
         import Draft_rc
         import Arch_rc
 
@@ -602,7 +602,7 @@ class ifc_vp_material:
     def setupContextMenu(self, vobj, menu):
         from . import ifc_tools  # lazy import
         from . import ifc_psets
-        from PySide import QtCore, QtGui  # lazy import
+        from PySide import QtGui  # lazy import
 
         if FreeCADGui.activeWorkbench().name() != 'BIMWorkbench':
             return
@@ -660,7 +660,7 @@ def get_filepath(project):
     """Saves the associated IFC file to another file"""
 
     from . import ifc_tools  # lazy import
-    from PySide import QtCore, QtGui  # lazy import
+    from PySide import QtGui  # lazy import
 
     sf = QtGui.QFileDialog.getSaveFileName(
         None,