Deltas = NewType('Deltas', TypingList[Gwei])

scripts/build_spec.py

@@ -12,7 +12,8 @@ from typing import (
 
 
 PHASE0_IMPORTS = '''from typing import (
-    Any, Callable, Iterable, Dict, Set, Tuple
+    Any, Callable, Iterable, Dict, Set, Tuple, NewType,
+    List as TypingList,
 )
 
 from eth2spec.utils.ssz.ssz_impl import (
@@ -30,12 +31,9 @@ from eth2spec.utils.bls import (
 )
 
 from eth2spec.utils.hash_function import hash
-
-
-Deltas = list
 '''
 PHASE1_IMPORTS = '''from typing import (
-    Any, Callable, Dict, Optional, Set, Tuple, Iterable,
+    Any, Callable, Dict, Optional, Set, Tuple, Iterable, NewType,
     List as TypingList
 )
 
@@ -56,9 +54,6 @@ from eth2spec.utils.bls import (
 )
 
 from eth2spec.utils.hash_function import hash
-
-
-Deltas = list
 '''
 SUNDRY_FUNCTIONS = '''
 # Monkey patch hash cache
@@ -149,6 +144,7 @@ def objects_to_spec(functions: Dict[str, str],
     spec = (
         imports
         + '\n\n' + new_type_definitions
+        + '\n\n' + "Deltas = NewType('Deltas', TypingList[Gwei])"
         + '\n\n' + constants_spec
         + '\n\n\n' + ssz_objects_instantiation_spec
         + '\n\n' + functions_spec

specs/core/0_beacon-chain.md

@@ -1405,8 +1405,8 @@ def get_base_reward(state: BeaconState, index: ValidatorIndex) -> Gwei:
 def get_attestation_deltas(state: BeaconState) -> Tuple[Deltas, Deltas]:
     previous_epoch = get_previous_epoch(state)
     total_balance = get_total_active_balance(state)
-    rewards = Deltas(0 for _ in range(len(state.validators)))
-    penalties = Deltas(0 for _ in range(len(state.validators)))
+    rewards = Deltas([Gwei(0) for _ in range(len(state.validators))])
+    penalties = Deltas([Gwei(0) for _ in range(len(state.validators))])
     eligible_validator_indices = [
         ValidatorIndex(index) for index, v in enumerate(state.validators)
         if is_active_validator(v, previous_epoch) or (v.slashed and previous_epoch + 1 < v.withdrawable_epoch)
@@ -1454,8 +1454,8 @@ def get_attestation_deltas(state: BeaconState) -> Tuple[Deltas, Deltas]:
 
 ```python
 def get_crosslink_deltas(state: BeaconState) -> Tuple[Deltas, Deltas]:
-    rewards = Deltas(0 for _ in range(len(state.validators)))
-    penalties = Deltas(0 for _ in range(len(state.validators)))
+    rewards = Deltas([Gwei(0) for _ in range(len(state.validators))])
+    penalties = Deltas([Gwei(0) for _ in range(len(state.validators))])
     epoch = get_previous_epoch(state)
     for offset in range(get_epoch_committee_count(state, epoch)):
         shard = Shard((get_epoch_start_shard(state, epoch) + offset) % SHARD_COUNT)