Hacks and fixes to get python code back in reasonable state

src/ifcopenshell-python/ifcopenshell/entity_instance.py

@@ -87,10 +87,6 @@ class entity_instance_mixin:
         print(wall.__class__) # <class 'ifcopenshell.entity_instance'>
     """
 
-    @property
-    def file(self):
-        raise NotImplementedError
-
     def __getattr__(self, name: str) -> Any:
         if name in ("this", "thisown") or name.startswith("_swig_"):
             return object.__getattr__(self, name)
@@ -300,15 +296,6 @@ class entity_instance_mixin:
     __rge__ = functools.partialmethod(compare, op=operator.ge, reverse=True)
     __rgt__ = functools.partialmethod(compare, op=operator.gt, reverse=True)
 
-    def __hash__(self):
-        # Proper entity instances have a stable identity by means of the numeric
-        # step id. Selected type instances (such as IfcPropertySingleValue.NominalValue
-        # always have id=0, so we hash <type, value, file pointer>
-        if id_ := self.id():
-            return hash((id_, self.file_pointer()))
-        else:
-            return hash((self.is_a(), self[0], self.file_pointer()))
-
     def __dir__(self):
         return sorted(
             set(

src/ifcopenshell-python/ifcopenshell/file.py

@@ -504,13 +504,30 @@ class file_mixin:
     to_delete: Union[set[ifcopenshell.entity_instance], None] = None
     """Entities for batch removal."""
 
+    registry = {}
+
+    def post_init(self, iden):
+        if state := self.registry.get(iden):
+            self.state = state
+        else:
+            self.state = self.registry[iden] = [[],[],None]
+
+    @property
+    def history(self):
+        return self.state[0]
+        
+    @property
+    def future(self):
+        return self.state[1]
     
+    @property
+    def transaction(self):
+        return self.state[2]
 
-    def post_init(self):
-        self.history = []
-        self.future = []
-        self.transaction: Optional[Transaction] = None
-
+    @transaction.setter
+    def transaction(self, v):
+        self.state[2] = v
+    
     def set_history_size(self, size: int) -> None:
         self.history_size = size
         while len(self.history) > self.history_size:
@@ -670,7 +687,7 @@ class file_mixin:
         if attr[0:6] == "create":
             return functools.partial(self.create_entity, attr[6:])
         else:
-            return getattr(self, attr)
+            raise AttributeError
 
     def __getitem__(self, key: Union[numbers.Integral, str, bytes]) -> entity_instance:
         if isinstance(key, numbers.Integral):

src/ifcopenshell-python/ifcopenshell/template.py

@@ -20,7 +20,7 @@
 import time
 import uuid
 
-from .file import file
+from ifcopenshell import file
 from .guid import compress
 from .ifcopenshell_wrapper import version
 from typing import Optional

src/ifcopenshell-python/ifcopenshell/util/pset.py

@@ -22,7 +22,7 @@ import ifcopenshell
 import ifcopenshell.ifcopenshell_wrapper as W
 import ifcopenshell.util.schema
 import ifcopenshell.util.type
-from ifcopenshell.entity_instance import entity_instance
+from ifcopenshell import entity_instance
 from functools import lru_cache
 from typing import Optional, Literal, NamedTuple, Union