Python 物件導向程式設計入門
George Boorman
Curriculum Manager, DataCamp
$$\Large{\text{新類別功能 = 舊類別功能 + 額外功能}}$$
class BankAccount: def __init__(self, balance): self.balance = balance def withdraw(self, amount): self.balance -= amount # Class inheriting from BankAccount class SavingsAccount(BankAccount): pass
class BankAccount: def __init__(self, balance): self.balance = balance def withdraw(self, amount): self.balance -= amount
# Class inheriting from BankAccount class SavingsAccount(BankAccount): pass
BankAccount
SavingsAccount
# Constructor inherited from BankAccount savings_acct = SavingsAccount(1000) type(savings_acct)
__main__.SavingsAccount
# Attribute inherited from BankAccount savings_acct.balance
1000
# Method inherited from BankAccount savings_acct.withdraw(300)
「SavingsAccount 是一個 BankAccount」
（可能帶有特殊功能）
savings_acct = SavingsAccount(1000) isinstance(savings_acct, SavingsAccount)
True
isinstance(savings_acct, BankAccount)
acct = BankAccount(500) isinstance(acct, SavingsAccount)
False
isinstance(acct, BankAccount)
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