python3 的lambda

bank.py

class Account:
    def __init__(self, name, number, balance):
        self.__name = name
        self.__number = number
        self.__balance = balance

    @property
    def name(self):
        return self.__name

    @property
    def number(self):
        return self.__number

    @property
    def balance(self):
        return self.__balance

    def deposit(self, amount):
        if amount <= 0:
            print('存款金額不得為負')
        else:
            self.__balance += amount

    def withdraw(self, amount):
        if amount > self.__balance:
            print('餘額不足')
        else:
            self.__balance -= amount

    def __str__(self):
        return "Account('{name}', '{number}', {balance})".format(
            name = self.__name, number = self.__number, balance = self.__balance
        )

>>> from bank import *

>>> acct = Account('Justin', '123-4567', 1000)

>>> deposit = lambda amount: Account.deposit(acct, amount)

>>> withdraw = lambda amount: Account.withdraw(acct, amount)

>>> deposit(500)

>>> withdraw(200)

>>> print(acct)

Account('Justin', '123-4567', 1300)

>>> 

[6]+  Stopped                 python3

Johnde-iPhone:object-oriented4 korekyourin$ python3

Python 3.4.4rc1 (v3.4.4rc1:04f3f725896c, Dec  6 2015, 10:40:23) 

[GCC 4.2.1 (Apple Inc. build 5666) (dot 3)] on darwin

Type "help", "copyright", "credits" or "license" for more information.

>>> from bank import *

>>> acct = Account('Justin', '123-4567', 1000)

>>> deposit = acct.deposit

>>> withdraw = acct.withdraw

>>> deposit(500)

>>> withdraw(200)

>>> print(acct)

Account('Justin', '123-4567', 1300)

以上為Pyhton3 的lambda 範例 參考林信良老師 Python3技術手冊