Simplify minimal SSZ again

scripts/build_spec.py

@@ -55,7 +55,6 @@ def merger(oldfile:str, newfile:str) -> str:
         found_old = False
         for old_item in old_object_tuples:
             if old_item[0] == re.match(object_regex, new_item).group(0):
-                print(old_item[0])
                 old_item[1] = new_item
                 found_old = True
                 break
@@ -67,7 +66,6 @@ def merger(oldfile:str, newfile:str) -> str:
 def build_phase0_spec(sourcefile, outfile=None):
     code_lines = []
     code_lines.append("""
-
 from typing import (
     Any,
     Dict,
@@ -75,16 +73,19 @@ from typing import (
     NewType,
     Tuple,
 )
+
 from eth2spec.utils.minimal_ssz import (
     SSZType,
     hash_tree_root,
     signing_root,
 )
+
 from eth2spec.utils.bls_stub import (
     bls_aggregate_pubkeys,
     bls_verify,
     bls_verify_multiple,
 )
+
 from eth2spec.utils.hash_function import hash
 
 
@@ -146,6 +147,7 @@ def apply_constants_preset(preset: Dict[str, Any]):
 
     # Initialize SSZ types again, to account for changed lengths
     init_SSZ_types()
+
 """)
 
     if outfile is not None:

test_libs/pyspec/eth2spec/utils/minimal_ssz.py

@@ -9,12 +9,8 @@ ZERO_CHUNK = b'\x00' * BYTES_PER_CHUNK
 cached_typedefs = {}
 
 
-def SSZType(name, fields):
+def SSZType(fields):
     class SSZObject():
-        if name is not None:
-            __name__ = name
-            __qualname__ = name
-
         def __init__(self, **kwargs):
             for f, t in fields.items():
                 if f not in kwargs:
@@ -31,12 +27,9 @@ def SSZType(name, fields):
         def __str__(self):
             output = []
             for field in self.fields:
-                output.append(f'{field}: {repr(getattr(self, field))},')
+                output.append(f'{field}: {getattr(self, field)}')
             return "\n".join(output)
 
-        def __repr__(self):
-            return name + "(**{\n    " + str(self).replace("\n", "\n    ") + "\n})"
-
         def serialize(self):
             return serialize_value(self, self.__class__)
 
@@ -44,19 +37,9 @@ def SSZType(name, fields):
             return hash_tree_root(self, self.__class__)
 
     SSZObject.fields = fields
-
-    if name is not None:
-        cached_typedefs[name] = SSZObject
-
     return SSZObject
 
 
-def SSZTypeExtension(original_type, new_fields):
-    typedef = cached_typedefs[original_type]
-    typedef.fields.update(new_fields)
-    return typedef
-
-
 class Vector():
     def __init__(self, items):
         self.items = items
@@ -334,7 +317,7 @@ def truncate(container):
         key: container.fields[key]
         for key in field_keys[:-1]
     }
-    truncated_class = SSZType(None, truncated_fields)
+    truncated_class = SSZType(truncated_fields)
     kwargs = {
         field: getattr(container, field)
         for field in field_keys[:-1]