[pre-commit.ci] auto fixes from pre-commit.com hooks

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Author: pre-commit-ci[bot]

blockchain/proof_of_stake.py

@@ -1,37 +1,40 @@
 import random
 from typing import List
 
+
 class Validator:
     """
     Represents a validator in a Proof of Stake system.
-    
+
     Attributes:
         name (str): The name of the validator.
         stake (int): The amount of stake (coins) the validator holds.
     """
+
     def __init__(self, name: str, stake: int):
         """
         Initializes a new validator with a given name and stake.
-        
+
         Args:
             name (str): The name of the validator.
             stake (int): The amount of stake the validator has.
         """
         self.name = name
         self.stake = stake
 
+
 def choose_validator(validators: List[Validator]) -> Validator:
     """
     Selects a validator to create the next block based on the weight of their stake.
-    
+
     The higher the stake, the greater the chance to be selected.
-    
+
     Args:
         validators (List[Validator]): A list of Validator objects.
-    
+
     Returns:
         Validator: The selected validator based on weighted random selection.
-    
+
     Example:
         >>> validators = [Validator("Alice", 50), Validator("Bob", 30), Validator("Charlie", 20)]
         >>> chosen = choose_validator(validators)
@@ -40,6 +43,7 @@ def choose_validator(validators: List[Validator]) -> Validator:
     """
     total_stake = sum(v.stake for v in validators)
     weighted_validators = [(v, v.stake / total_stake) for v in validators]
-    selected = random.choices([v[0] for v in weighted_validators],
-                              weights=[v[1] for v in weighted_validators])
+    selected = random.choices(
+        [v[0] for v in weighted_validators], weights=[v[1] for v in weighted_validators]
+    )
     return selected[0]