diff --git a/src/ifcopenshell-python/ifcopenshell/__init__.py b/src/ifcopenshell-python/ifcopenshell/__init__.py
index 231eb26f5b..f061122789 100644
--- a/src/ifcopenshell-python/ifcopenshell/__init__.py
+++ b/src/ifcopenshell-python/ifcopenshell/__init__.py
@@ -49,6 +49,7 @@ except Exception as e:
     if int(python_version_tuple[0]) == 2:
         # Only for py2, as py3 has exception chaining
         import traceback
+
         traceback.print_exc()
         print('-' * 64)
     raise ImportError("IfcOpenShell not built for '%s'" % python_distribution)
diff --git a/src/ifcopenshell-python/ifcopenshell/entity_instance.py b/src/ifcopenshell-python/ifcopenshell/entity_instance.py
index 5cde924d33..c287d578e0 100644
--- a/src/ifcopenshell-python/ifcopenshell/entity_instance.py
+++ b/src/ifcopenshell-python/ifcopenshell/entity_instance.py
@@ -65,6 +65,7 @@ class entity_instance(object):
         def wrap(e): return entity_instance(e)
 
         def is_instance(e): return isinstance(e, ifcopenshell_wrapper.entity_instance)
+
         return entity_instance.walk(is_instance, wrap, v)
 
     @staticmethod
@@ -72,6 +73,7 @@ class entity_instance(object):
         def unwrap(e): return e.wrapped_data
 
         def is_instance(e): return isinstance(e, entity_instance)
+
         return entity_instance.walk(is_instance, unwrap, v)
 
     def attribute_type(self, attr):
@@ -99,12 +101,13 @@ class entity_instance(object):
             try:
                 if isinstance(value, unicode):
                     value = value.encode("utf-8")
-            except:
+            except BaseException:
                 pass
             try:
                 getattr(self.wrapped_data, "setArgumentAs%s" % attr_type)(idx, entity_instance.unwrap_value(value))
-            except:
-                raise ValueError("Expected %s for attribute %s.%s, got %r" % (real_attr_type, self.is_a(), self.attribute_name(idx), value))
+            except BaseException:
+                raise ValueError("Expected %s for attribute %s.%s, got %r" % (
+                    real_attr_type, self.is_a(), self.attribute_name(idx), value))
         return value
 
     def __len__(self):
@@ -120,7 +123,7 @@ class entity_instance(object):
         return self.wrapped_data.id()
 
     def __eq__(self, other):
-        if type(self) != type(other):
+        if not isinstance(self, type(other)):
             return False
         return self.wrapped_data == other.wrapped_data
 
@@ -140,7 +143,7 @@ class entity_instance(object):
                 if include_identifier:
                     yield "id", self.id()
                 yield "type", self.is_a()
-            except:
+            except BaseException:
                 logging.exception("unhandled exception while getting id / type info on {}".format(self))
             for i in range(len(self)):
                 try:
@@ -160,10 +163,12 @@ class entity_instance(object):
                                                             return_type=return_type,
                                                             ignore=ignore
                                                             )
+
                         attr_value = entity_instance.walk(is_instance, get_info_, attr_value)
                     yield self.attribute_name(i), attr_value
-                except:
+                except BaseException:
                     logging.exception("unhandled exception occured setting attribute name for {}".format(self))
+
         return return_type(_())
 
     __dict__ = property(get_info)
diff --git a/src/ifcopenshell-python/ifcopenshell/file.py b/src/ifcopenshell-python/ifcopenshell/file.py
index 73009b1b62..dfe5b6b933 100644
--- a/src/ifcopenshell-python/ifcopenshell/file.py
+++ b/src/ifcopenshell-python/ifcopenshell/file.py
@@ -61,9 +61,11 @@ class file(object):
         elif isinstance(key, basestring):
             return entity_instance(self.wrapped_data.by_guid(str(key)))
 
-    def by_id(self, id): return self[id]
+    def by_id(self, id):
+        return self[id]
 
-    def by_guid(self, guid): return self[guid]
+    def by_guid(self, guid):
+        return self[guid]
 
     def add(self, inst):
         inst.wrapped_data.this.disown()
diff --git a/src/ifcopenshell-python/ifcopenshell/geom/app.py b/src/ifcopenshell-python/ifcopenshell/geom/app.py
index 7a1cea1355..8f0e6738fd 100644
--- a/src/ifcopenshell-python/ifcopenshell/geom/app.py
+++ b/src/ifcopenshell-python/ifcopenshell/geom/app.py
@@ -15,7 +15,7 @@ from collections import defaultdict, Iterable, OrderedDict
 os.environ['QT_API'] = 'pyqt4'
 try:
     from pyqode.qt import QtCore
-except:
+except BaseException:
     pass
 
 from PyQt4 import QtGui, QtCore
@@ -24,22 +24,21 @@ from .code_editor_pane import code_edit
 
 try:
     from OCC.Display.pyqt4Display import qtViewer3d
-except:
+except BaseException:
     import OCC.Display
 
     try:
         import OCC.Display.backend
-    except:
+    except BaseException:
         pass
 
     try:
         OCC.Display.backend.get_backend("qt-pyqt4")
-    except:
+    except BaseException:
         OCC.Display.backend.load_backend("qt-pyqt4")
 
     from OCC.Display.qtDisplay import qtViewer3d
 
-
 from .main import settings, iterator
 from .occ_utils import display_shape
 
@@ -58,10 +57,11 @@ class configuration(object):
         try:
             import ConfigParser
             Cfg = ConfigParser.RawConfigParser
-        except:
+        except BaseException:
             import configparser
 
-            def Cfg(): return configparser.ConfigParser(interpolation=None)
+            def Cfg():
+                return configparser.ConfigParser(interpolation=None)
 
         conf_file = os.path.expanduser(os.path.join("~", ".ifcopenshell", "app", "snippets.conf"))
         if conf_file.startswith("~"):
@@ -114,7 +114,6 @@ if selection:
 
 
 class application(QtGui.QApplication):
-
     """A pythonOCC, PyQt based IfcOpenShell application
     with two tree views and a graphical 3d view"""
 
@@ -165,7 +164,8 @@ class application(QtGui.QApplication):
             itm = self.product_to_item.get(product)
             if itm is None:
                 return
-            self.selectionModel().setCurrentIndex(itm, QtGui.QItemSelectionModel.SelectCurrent | QtGui.QItemSelectionModel.Rows)
+            self.selectionModel().setCurrentIndex(itm,
+                                                  QtGui.QItemSelectionModel.SelectCurrent | QtGui.QItemSelectionModel.Rows)
 
     class decomposition_treeview(abstract_treeview):
 
@@ -233,6 +233,7 @@ class application(QtGui.QApplication):
                         itm = items[t2] = QtGui.QTreeWidgetItem(items.get(s2, self), [t2])
                         itm.setData(0, QtCore.Qt.UserRole, t2)
                         self.children[s2].append(t2)
+
                 add(t)
 
             for p in products:
@@ -379,6 +380,7 @@ class application(QtGui.QApplication):
                         shp = OCC.AIS.Handle_AIS_Shape.DownCast(li.Value(i + 1))
                         if not shp.IsNull():
                             yield shp
+
             return tuple(shp.HashCode(1 << 24) for shp in yield_shapes())
 
         def __init__(self, widget):
@@ -528,6 +530,7 @@ class application(QtGui.QApplication):
             for c in self.components:
                 if c != component:
                     c.select(inst)
+
         return handler
 
     def __init__(self, settings=None):
@@ -582,7 +585,8 @@ class application(QtGui.QApplication):
         sys.exit(self.exec_())
 
     def browse(self):
-        filename = QtGui.QFileDialog.getOpenFileName(self.window, 'Open file', ".", "Industry Foundation Classes (*.ifc)")
+        filename = QtGui.QFileDialog.getOpenFileName(self.window, 'Open file', ".",
+                                                     "Industry Foundation Classes (*.ifc)")
         self.load(filename)
 
     def clear(self):
diff --git a/src/ifcopenshell-python/ifcopenshell/geom/code_editor_pane.py b/src/ifcopenshell-python/ifcopenshell/geom/code_editor_pane.py
index b1fa4ffc15..e4306cd1a7 100644
--- a/src/ifcopenshell-python/ifcopenshell/geom/code_editor_pane.py
+++ b/src/ifcopenshell-python/ifcopenshell/geom/code_editor_pane.py
@@ -11,7 +11,7 @@ from PyQt4 import QtCore, QtGui
 
 try:
     from PyQt4 import QtWidgets
-except:
+except BaseException:
     QtWidgets = QtGui
 
 try:
@@ -24,14 +24,14 @@ try:
     from pyqode.python.backend import server
     from pyqode.python import modes as pymodes, panels as pypanels, widgets
     from pyqode.python.widgets import PyInteractiveConsole
+
     has_pyqode = True
-except:
+except BaseException:
     has_pyqode = False
     CodeEdit = QtWidgets.QPlainTextEdit
 
 
 class StdoutRedirector(object):
-
     '''A class for redirecting stdout to this Text widget.'''
 
     def __init__(self, widget):
@@ -49,7 +49,6 @@ class StdoutRedirector(object):
 
 
 class code_edit(QtGui.QWidget):
-
     class Console(InteractiveConsole):
         def __init__(*args):
             InteractiveConsole.__init__(*args)
diff --git a/src/ifcopenshell-python/ifcopenshell/geom/main.py b/src/ifcopenshell-python/ifcopenshell/geom/main.py
index bb97ec96d3..adbc53863c 100644
--- a/src/ifcopenshell-python/ifcopenshell/geom/main.py
+++ b/src/ifcopenshell-python/ifcopenshell/geom/main.py
@@ -32,7 +32,7 @@ from ..entity_instance import entity_instance
 def has_occ():
     try:
         import OCC.BRepTools
-    except:
+    except BaseException:
         return False
     return True
 
@@ -40,13 +40,17 @@ def has_occ():
 has_occ = has_occ()
 
 
-def wrap_shape_creation(settings, shape): return shape
+def wrap_shape_creation(settings, shape):
+    return shape
 
 
 if has_occ:
     from . import occ_utils as utils
 
-    def wrap_shape_creation(settings, shape): return utils.create_shape_from_serialization(shape) if getattr(settings, 'use_python_opencascade', False) else shape
+    def wrap_shape_creation(settings, shape): return utils.create_shape_from_serialization(shape) if getattr(settings,
+                                                                                                             'use_python_opencascade',
+                                                                                                             False) else shape
+
 
 # Subclass the settings module to provide an additional
 # setting to enable pythonOCC when available
@@ -83,6 +87,7 @@ class iterator(_iterator):
         else:
             file_or_filename = os.path.abspath(file_or_filename)
         _iterator.__init__(self, settings, file_or_filename)
+
     if has_occ:
         def get(self):
             return wrap_shape_creation(self.settings, _iterator.get(self))
@@ -108,6 +113,7 @@ class tree(ifcopenshell_wrapper.tree):
             elif all(map(lambda v: hasattr(value, v), "XYZ")):
                 return value.X(), value.Y(), value.Z()
             return value
+
         args = [self, unwrap(value)]
         if isinstance(value, entity_instance):
             args.append(kwargs.get("completely_within", False))
@@ -124,6 +130,7 @@ class tree(ifcopenshell_wrapper.tree):
             elif hasattr(value, "Get"):
                 return value.Get()[:3], value.Get()[3:]
             return value
+
         args = [self, unwrap(value)]
         if "extend" in kwargs or "completely_within" in kwargs:
             args.append(kwargs.get("completely_within", False))
@@ -152,7 +159,9 @@ def iterate(settings, filename):
 
 
 def make_shape_function(fn):
-    def entity_instance_or_none(e): return None if e is None else entity_instance(e)
+    def entity_instance_or_none(e):
+        return None if e is None else entity_instance(e)
+
     if has_occ:
         import OCC.TopoDS
 
diff --git a/src/ifcopenshell-python/ifcopenshell/geom/occ_utils.py b/src/ifcopenshell-python/ifcopenshell/geom/occ_utils.py
index a5ed911b97..ec4d83b7ac 100644
--- a/src/ifcopenshell-python/ifcopenshell/geom/occ_utils.py
+++ b/src/ifcopenshell-python/ifcopenshell/geom/occ_utils.py
@@ -61,7 +61,7 @@ def initialize_display():
             while True:
                 try:
                     active_light = viewer.ActiveLight()
-                except:
+                except BaseException:
                     break
                 yield active_light
                 viewer.NextActiveLights()
@@ -115,7 +115,8 @@ def display_shape(shape, clr=None, viewer_handle=None):
         ais.SetMaterial(material)
 
         if isinstance(clr, str):
-            qclr = getattr(OCC.Quantity, "Quantity_NOC_%s" % clr.upper(), getattr(OCC.Quantity, "Quantity_NOC_%s1" % clr.upper(), None))
+            qclr = getattr(OCC.Quantity, "Quantity_NOC_%s" % clr.upper(),
+                           getattr(OCC.Quantity, "Quantity_NOC_%s1" % clr.upper(), None))
             if qclr is None:
                 raise Exception("No color named '%s'" % clr.upper())
         elif isinstance(clr, Iterable):
@@ -146,7 +147,8 @@ def display_shape(shape, clr=None, viewer_handle=None):
             for shp, stl in zip(subshapes, representation.styles):
                 subshape = OCC.AIS.AIS_Shape(shp)
                 if min(stl) < 0. or max(stl) > 1.:
-                    default_style_applied = stl = DEFAULT_STYLES.get(representation.data.type, DEFAULT_STYLES["DEFAULT"])
+                    default_style_applied = stl = DEFAULT_STYLES.get(representation.data.type,
+                                                                     DEFAULT_STYLES["DEFAULT"])
                 subshape.SetColor(OCC.Quantity.Quantity_Color(stl[0], stl[1], stl[2], OCC.Quantity.Quantity_TOC_RGB))
                 subshape.SetMaterial(material)
                 if len(stl) == 4 and stl[3] < 1.:
@@ -171,7 +173,9 @@ def display_shape(shape, clr=None, viewer_handle=None):
         ais = OCC.AIS.AIS_Shape(shape)
         ais.SetMaterial(material)
 
-        def r(): return random.random() * 0.3 + 0.7
+        def r():
+            return random.random() * 0.3 + 0.7
+
         clr = OCC.Quantity.Quantity_Color(r(), r(), r(), OCC.Quantity.Quantity_TOC_RGB)
         ais.SetColor(clr)
 
@@ -211,12 +215,12 @@ def create_shape_from_serialization(brep_object):
     try:
         brep_data = brep_object.geometry.brep_data
         styles = brep_object.geometry.surface_styles
-    except:
+    except BaseException:
         try:
             brep_data = brep_object.brep_data
             styles = brep_object.surface_styles
             is_product_shape = False
-        except:
+        except BaseException:
             pass
 
     styles = tuple(styles[i:i + 4] for i in range(0, len(styles), 4))
@@ -228,7 +232,7 @@ def create_shape_from_serialization(brep_object):
         ss = OCC.BRepTools.BRepTools_ShapeSet()
         ss.ReadFromString(brep_data)
         occ_shape = ss.Shape(ss.NbShapes())
-    except:
+    except BaseException:
         pass
 
     if is_product_shape:
diff --git a/src/ifcopenshell-python/ifcopenshell/guid.py b/src/ifcopenshell-python/ifcopenshell/guid.py
index 2bbafb6eb8..b14ce43f4e 100644
--- a/src/ifcopenshell-python/ifcopenshell/guid.py
+++ b/src/ifcopenshell-python/ifcopenshell/guid.py
@@ -33,13 +33,15 @@ def compress(g):
     bs = [int(g[i:i + 2], 16) for i in range(0, len(g), 2)]
 
     def b64(v, l=4):
-        return ''.join([chars[(v // (64**i)) % 64] for i in range(l)][::-1])
+        return ''.join([chars[(v // (64 ** i)) % 64] for i in range(l)][::-1])
+
     return ''.join([b64(bs[0], 2)] + [b64((bs[i] << 16) + (bs[i + 1] << 8) + bs[i + 2]) for i in range(1, 16, 3)])
 
 
 def expand(g):
     def b64(v):
         return reduce(lambda a, b: a * 64 + b, map(lambda c: chars.index(c), v))
+
     bs = [b64(g[0:2])]
     for i in range(5):
         d = b64(g[2 + 4 * i:6 + 4 * i])
diff --git a/src/ifcopenshell-python/ifcopenshell/template.py b/src/ifcopenshell-python/ifcopenshell/template.py
index 7e1dfa329a..fdc34aec07 100644
--- a/src/ifcopenshell-python/ifcopenshell/template.py
+++ b/src/ifcopenshell-python/ifcopenshell/template.py
@@ -74,13 +74,13 @@ DEFAULTS = {
 def create(filename=None, timestring=None, organization=None, creator=None,
            schema_identifier=None, application_version=None, timestamp=None,
            application=None, project_globalid=None, project_name=None):
-
     d = dict(locals())
 
     def _():
         for var, value in d.items():
             if value is None:
                 yield var, DEFAULTS.get(var, lambda *args: '')(d)
+
     d.update(dict(_()))
 
     return file.from_string(TEMPLATE % d)