diff --git a/test_libs/pyspec/eth2spec/fuzzing/test_decoder.py b/test_libs/pyspec/eth2spec/fuzzing/test_decoder.py
index b362d503b..c707c840a 100644
--- a/test_libs/pyspec/eth2spec/fuzzing/test_decoder.py
+++ b/test_libs/pyspec/eth2spec/fuzzing/test_decoder.py
@@ -9,7 +9,7 @@ def test_decoder():
     rng = Random(123)
 
     # check these types only, Block covers a lot of operation types already.
-    # TODO: Once has Bitfields and Bitvectors, add back 
+    # TODO: Once has Bitfields and Bitvectors, add back
     #       spec.BeaconState and spec.BeaconBlock
     for typ in [spec.IndexedAttestation, spec.AttestationDataAndCustodyBit]:
         # create a random pyspec value
diff --git a/test_libs/pyspec/eth2spec/test/phase_0/block_processing/test_process_attestation.py b/test_libs/pyspec/eth2spec/test/phase_0/block_processing/test_process_attestation.py
index ee76ab23d..d17d93e6d 100644
--- a/test_libs/pyspec/eth2spec/test/phase_0/block_processing/test_process_attestation.py
+++ b/test_libs/pyspec/eth2spec/test/phase_0/block_processing/test_process_attestation.py
@@ -311,7 +311,8 @@ def test_empty_aggregation_bitfield(spec, state):
     attestation = get_valid_attestation(spec, state)
     state.slot += spec.MIN_ATTESTATION_INCLUSION_DELAY
 
-    attestation.aggregation_bitfield = Bitlist[spec.MAX_INDICES_PER_ATTESTATION](*([0] * len(attestation.aggregation_bitfield)))
+    attestation.aggregation_bitfield = Bitlist[spec.MAX_INDICES_PER_ATTESTATION](
+        *([0b0] * len(attestation.aggregation_bitfield)))
 
     sign_attestation(spec, state, attestation)
 
diff --git a/test_libs/pyspec/eth2spec/utils/ssz/ssz_typing.py b/test_libs/pyspec/eth2spec/utils/ssz/ssz_typing.py
index 6ce2b1538..85f5e0bdb 100644
--- a/test_libs/pyspec/eth2spec/utils/ssz/ssz_typing.py
+++ b/test_libs/pyspec/eth2spec/utils/ssz/ssz_typing.py
@@ -364,11 +364,12 @@ class Bitvector(BaseBitfield):
     @classmethod
     def is_fixed_size(cls):
         return True
-    
+
     @classmethod
     def default(cls):
         return cls(0 for _ in range(cls.length))
 
+
 class List(BaseList):
 
     @classmethod