PEP8-ish cleanup

scripts/phase0/build_spec.py

@@ -5,10 +5,8 @@
 def build_phase0_spec(sourcefile, outfile):
     code_lines = []
     code_lines.append("""
-
 from typing import (
     Any,
-    Callable,
     Dict,
     List,
     NewType,
@@ -17,19 +15,16 @@ def build_phase0_spec(sourcefile, outfile):
 from eth2spec.utils.minimal_ssz import *
 from eth2spec.utils.bls_stub import *
 
-
-    """)
+""")
     for i in (1, 2, 3, 4, 8, 32, 48, 96):
         code_lines.append("def int_to_bytes%d(x): return x.to_bytes(%d, 'little')" % (i, i))
 
     code_lines.append("""
+
 # stub, will get overwritten by real var
 SLOTS_PER_EPOCH = 64
 
 
-def slot_to_epoch(x): return x // SLOTS_PER_EPOCH
-
-
 Slot = NewType('Slot', int)  # uint64
 Epoch = NewType('Epoch', int)  # uint64
 Shard = NewType('Shard', int)  # uint64
@@ -38,9 +33,8 @@ def slot_to_epoch(x): return x // SLOTS_PER_EPOCH
 Bytes32 = NewType('Bytes32', bytes)  # bytes32
 BLSPubkey = NewType('BLSPubkey', bytes)  # bytes48
 BLSSignature = NewType('BLSSignature', bytes)  # bytes96
-Any = None
 Store = None
-    """)
+""")
 
     code_lines += function_puller.get_spec(sourcefile)
 
@@ -88,7 +82,7 @@ def apply_constants_preset(preset: Dict[str, Any]):
 
     # Deal with derived constants
     global_vars['GENESIS_EPOCH'] = slot_to_epoch(GENESIS_SLOT)
-    
+
     # Initialize SSZ types again, to account for changed lengths
     init_SSZ_types()
 """)

scripts/phase0/function_puller.py

@@ -62,9 +62,10 @@ def get_spec(file_name: str) -> List[str]:
         code_lines.append('')
         for type_line in ssz_type:
             code_lines.append('    ' + type_line)
-    code_lines.append('')
+    code_lines.append('\n')
     code_lines.append('ssz_types = [' + ', '.join([f'\'{ssz_type_name}\'' for (ssz_type_name, _) in type_defs]) + ']')
-    code_lines.append('')
-    code_lines.append('def get_ssz_type_by_name(name: str) -> SSZType: return globals()[name]')
+    code_lines.append('\n')
+    code_lines.append('def get_ssz_type_by_name(name: str) -> SSZType:')
+    code_lines.append('    return globals()[name]')
     code_lines.append('')
     return code_lines

specs/core/0_beacon-chain.md

@@ -687,7 +687,6 @@ def is_slashable_validator(validator: Validator, epoch: Epoch) -> bool:
     Check if ``validator`` is slashable.
     """
     return validator.slashed is False and (validator.activation_epoch <= epoch < validator.withdrawable_epoch)
-
 ```
 
 ### `get_active_validator_indices`
@@ -1250,7 +1249,7 @@ def get_genesis_beacon_state(genesis_validator_deposits: List[Deposit],
         process_deposit(state, deposit)
 
     # Process genesis activations
-    for index, validator in enumerate(state.validator_registry):
+    for validator in state.validator_registry:
         if validator.effective_balance >= MAX_EFFECTIVE_BALANCE:
             validator.activation_eligibility_epoch = GENESIS_EPOCH
             validator.activation_epoch = GENESIS_EPOCH
@@ -1366,7 +1365,7 @@ def get_winning_crosslink_and_attesting_indices(state: BeaconState, shard: Shard
         if hash_tree_root(state.current_crosslinks[shard]) in (c.previous_crosslink_root, hash_tree_root(c))
     ]
     if len(candidate_crosslinks) == 0:
-        return Crosslink(epoch=GENESIS_EPOCH, previous_crosslink_root=ZERO_HASH, crosslink_data_root=ZERO_HASH), []
+        return Crosslink(epoch=GENESIS_EPOCH), []
 
     def get_attestations_for(crosslink: Crosslink) -> List[PendingAttestation]:
         return [a for a in shard_attestations if get_crosslink_from_attestation_data(state, a.data) == crosslink]
@@ -1461,15 +1460,14 @@ def get_base_reward(state: BeaconState, index: ValidatorIndex) -> Gwei:
     if adjusted_quotient == 0:
         return 0
     return state.validator_registry[index].effective_balance // adjusted_quotient // BASE_REWARDS_PER_EPOCH
-
 ```
 
 ```python
 def get_attestation_deltas(state: BeaconState) -> Tuple[List[Gwei], List[Gwei]]:
     previous_epoch = get_previous_epoch(state)
     total_balance = get_total_active_balance(state)
-    rewards = [0 for index in range(len(state.validator_registry))]
-    penalties = [0 for index in range(len(state.validator_registry))]
+    rewards = [0 for _ in range(len(state.validator_registry))]
+    penalties = [0 for _ in range(len(state.validator_registry))]
     eligible_validator_indices = [
         index for index, v in enumerate(state.validator_registry)
         if is_active_validator(v, previous_epoch) or (v.slashed and previous_epoch + 1 < v.withdrawable_epoch)
@@ -1509,8 +1507,8 @@ def get_attestation_deltas(state: BeaconState) -> Tuple[List[Gwei], List[Gwei]]:
 
 ```python
 def get_crosslink_deltas(state: BeaconState) -> Tuple[List[Gwei], List[Gwei]]:
-    rewards = [0 for index in range(len(state.validator_registry))]
-    penalties = [0 for index in range(len(state.validator_registry))]
+    rewards = [0 for _ in range(len(state.validator_registry))]
+    penalties = [0 for _ in range(len(state.validator_registry))]
     for slot in range(get_epoch_start_slot(get_previous_epoch(state)), get_epoch_start_slot(get_current_epoch(state))):
         epoch = slot_to_epoch(slot)
         for crosslink_committee, shard in get_crosslink_committees_at_slot(state, slot):

test_libs/gen_helpers/gen_base/gen_typing.py

@@ -1,4 +1,10 @@
-from typing import Callable, Dict, Tuple, Any
+from typing import (
+    Any,
+    Callable,
+    Dict,
+    Tuple,
+)
+
 
 TestCase = Dict[str, Any]
 TestSuite = Dict[str, Any]