Python 面向对象编程入门
George Boorman
Curriculum Manager, DataCamp
$$\Large{\text{新类功能 = 旧类功能 + 额外功能}}$$
class BankAccount: def __init__(self, balance): self.balance = balance def withdraw(self, amount): self.balance -= amount # 继承自 BankAccount 的类 class SavingsAccount(BankAccount): pass
class BankAccount: def __init__(self, balance): self.balance = balance def withdraw(self, amount): self.balance -= amount
# 继承自 BankAccount 的类 class SavingsAccount(BankAccount): pass
BankAccount
SavingsAccount
# 构造函数从 BankAccount 继承 savings_acct = SavingsAccount(1000) type(savings_acct)
__main__.SavingsAccount
# 属性从 BankAccount 继承 savings_acct.balance
1000
# 方法从 BankAccount 继承 savings_acct.withdraw(300)
SavingsAccount 是一个 BankAccount
（可能带有特殊功能）
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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