Describing Scoping Rules
- As stated already, classes define a namespace
- Meaning, they create a scope for methods and class variables
- However, classes do not create a scope for names used inside the bodies of methods
-
Specifically, the namespace of an instance includes:
- Methods
- Class variables
- Properties
>>> class Account(object):
... num_accounts = 0
... def __init__(self, name, balance):
... self.name = name
... self.balance = balance
... Account.num_accounts += 1
... def __del__(self):
... Account.num_accounts -= 1
... def deposit(self, amt):
... self.balance = self.balance + amt
... def withdraw(self, amt):
... self.balance = self.balance - amt
... def inquiry(self):
... return self.balance
>>> a = Account('Todd', 2000)
>>> dir(a)
['__class__', '__del__', '__delattr__', '__dict__',
'__dir__', '__doc__', '__eq__', '__format__', '__ge__',
'__getattribute__', '__gt__', '__hash__', '__init__',
'__init_subclass__', '__le__', '__lt__', '__module__',
'__ne__', '__new__', '__reduce__', '__reduce_ex__',
'__repr__', '__setattr__', '__sizeof__', '__str__',
'__subclasshook__', '__weakref__', 'balance', 'deposit',
'inquiry', 'name', 'num_accounts', 'withdraw']References
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