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Could somebody explain me difference between these two pieces of code? I know that in the second case the arguments can be passed while instansiating the object but my problem was that when I used the 2 option, then the ledger list contained all objects that I have created. With the first one list is unique for the object as expected.

  1. def __init__(self, category):

 self.category = category
 self.ledger = []
 self.balance = 0.0

  2. def __init__(self, category, ledger = [], balance = 0.0):

 # Assign self to object
 self.category = category
 self.ledger = ledger
 self.balance = balance
scooby-doo
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    Relevant doc: https://docs.python.org/3/reference/compound_stmts.html#function-definitions. "the expression is evaluated once, when the function is defined, and that the same “pre-computed” value is used for each call." – j1-lee Jul 01 '22 at 18:37
  • `ledger = None,` in arguments then `self.ledger = ledger or []` – azro Jul 01 '22 at 18:39

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