fix type checking and proposer_slashings inputs

Author: ChihChengLiang

eth/beacon/helpers.py

@@ -43,6 +43,10 @@
 )
 import functools
 
+from eth.beacon.typing import (
+    ShardNumber,
+    BLSPubkey,
+)
 
 if TYPE_CHECKING:
     from eth.beacon.types.attestation_data import AttestationData  # noqa: F401
@@ -51,10 +55,6 @@
     from eth.beacon.types.fork_data import ForkData  # noqa: F401
     from eth.beacon.types.slashable_vote_data import SlashableVoteData  # noqa: F401
     from eth.beacon.types.validator_records import ValidatorRecord  # noqa: F401
-    from eth.beacon.typing import (
-        ShardNumber,
-        BLSPubkey,
-    )
 
 
 def _get_element_from_recent_list(

eth/beacon/types/proposer_slashings.py

@@ -35,9 +35,9 @@ def __init__(self,
                  proposal_signature_1: BLSSignatureAggregated = EMPTY_SIGNATURE,
                  proposal_signature_2: BLSSignatureAggregated = EMPTY_SIGNATURE) -> None:
         super().__init__(
-            proposer_index,
-            proposal_data_1,
-            proposal_data_2,
-            proposal_signature_1,
-            proposal_signature_2,
+            proposer_index=proposer_index,
+            proposal_data_1=proposal_data_1,
+            proposal_data_2=proposal_data_2,
+            proposal_signature_1=proposal_signature_1,
+            proposal_signature_2=proposal_signature_2,
         )