Assignment Chapter 6 Introduction to Object Oriented Programming
1. Write a Python program to get the class name of an instance in Python.
1. 编写一个 Python 程序，获取 Python 实例的类名。
# Program
class Example:
def __init__(self, name, value):
self.name = name
self.value = value
example_instance = Example("example", 42)
print(example_instance.__class__.__name__)Example2. Create a Python class and write a program to create all possible strings by using 'a', 'e', 'i', 'o', 'u'. Use the characters exactly once.
2. 创建一个 Python 类并编写一个程序，使用 "a"、"e"、"i"、"o"、"u "创建所有可能的字符串。 请使用这些字符一次。
# Program
class String:
def __init__(self, args):
self.chars=args
def print_all_kinds(self):
for i in range(len(self.chars)):
print(''.join(self.chars))
self.chars.append(self.chars[0])
self.chars.pop(0)
string = String(['a','e','i','o','u'])
string.print_all_kinds()
aeiou
eioua
iouae
ouaei
uaeio3. Derive class Contact from the base classes Person and Address and use their methods to print out the contact information.
3. 从基类 Person 和 Address 派生出类 Contact，并使用它们的方法来打印联系人信息。
Hint: Address class: show() will print street and city 提示：Address类：show() 将打印街道和城市信息
Person class: show() will print name and email Person类：show() 将打印姓名和电子邮件
# Program
class Person:
def __init__(self, name):
self.name = name
def name_show(self):
print(f'姓名:{self.name}')
class Address:
def __init__(self, address):
self.address = address
def address_show(self):
print(f"地址:{self.address}")
class Contact(Person, Address):
def __init__(self, name, address):
Person.__init__(self, name)
Address.__init__(self, address)
def print_information(self):
self.name_show()
self.address_show()
example = Contact('name1', 'address1')
example.print_information()
姓名:name1
地址:address14. Create a SavingsAccount class that behaves just like a BankAccount, but also has an interest rate and a method that increases the balance by the appropriate amount of interest.
4. 创建一个 SavingsAccount 类，该类的行为与 BankAccount 类似，但也有一个利率和一个按适当利息额增加余额的方法。
# Program
class SavingsAccount:
def __init__(self, rate, amount, time):
self.rate=rate
self.amount=amount
self.time=time
def amount_cauculation(self):
print(f'你原来的余额是{self.amount}\n利率为{self.rate}\n{self.time}年后,你的余额为{self.amount*((self.rate+1)**self.time)}')
example = SavingsAccount(0.018,10000,30)
example.amount_cauculation()你原来的余额是10000
利率为0.018
30年后,你的余额为17077.8557147110265. Create a BankAccount class. Your class should support the following methods:
5. 创建一个 BankAccount 类。 您的类应支持以下方法：
# Program
class BankAccount:
"""Bank Account protected by a pin number.\n银行账户受密码保护"""
def __init__(self, pin):
"""Initial account balance is 0 and pin is 'pin'.\n初始账户余额为 0，密码为 "pin"。"""
def deposit(self, pin, amount):
"""Increment account balance by amount and return new balance.\n按金额增加账户余额并返回新余额。"""
def withdraw(self, pin, amount):
"""Decrement account balance by amount and return amount withdrawn.\n按金额减少账户余额，并退回提取的金额。"""
def get_balance(self, pin):
"""Return account balance.\n退还账户余额。"""
def change_pin(self, oldpin, newpin):
"""Change pin from oldpin to newpin.\n将旧密码改为新密码"""
As you implement your BankAccount class, you should think about the following:
What should be stored within the BankAccount class? That is, what are its instance variables?
What should happen if the wrong pin is provided for any of the methods (other than init, which is setting the initial pin)?
What should happen if you try to withdraw more than is in the account?
Does your bank account behave as you expect? Try depositing and/or withdrawing change, instead of whole dollar amounts. Do you want your real bank account to behave this way?
在实现 BankAccount 类时，您应该考虑以下几点：
BankAccount 类中应存储哪些内容？ 也就是说，它的实例变量是什么？
如果为任何方法（除 init 以外，该方法用于设置初始密码）提供了错误的密码，会发生什么情况？
如果试图提取的金额超过账户余额，会发生什么情况？
您的银行账户是否如您所料？ 尝试存入和/或取出零钱，而不是整数美元。 您希望您的真实银行账户也这样吗？
# Program
class BankAccount:
"""Bank Account protected by a pin number.\n银行账户受密码保护"""
def __init__(self, pin):
"""Initial account balance is 0 and pin is 'pin'.\n初始账户余额为 0，密码为 "pin"。"""
self.pin=pin
self.amount=0
self.login_state=False
def deposit(self):
"""Increment account balance by amount and return new balance.\n按金额增加账户余额并返回新余额。"""
name='存款系统'
if self.login_state==False:
psw=input(f'{name}:请输入密码\n')
if psw == self.pin:
print(f'{name}:密码输入正确')
self.login_state=True
deposit_amount=float(input(f'{name}:请输入存入金额'))
if deposit_amount>0:
self.amount+=deposit_amount
print(f'{name}:已存入{deposit_amount}')
else:
print(f'{name}:不合法数据')
else:
print(f'{name}:密码输入错误')
elif self.login_state==True:
print(f'{name}:已处于登录(Debug)状态')
deposit_amount=float(input(f'{name}:请输入存入金额'))
if deposit_amount>0:
self.amount+=deposit_amount
print(f'{name}:已存入{deposit_amount}')
else:
print(f'{name}:不合法数据')
def withdraw(self):
"""Decrement account balance by amount and return amount withdrawn.\n按金额减少账户余额，并退回提取的金额。"""
name='取款系统'
if self.login_state==False:
psw=input(f'{name}:请输入密码\n')
if psw == self.pin:
print(f'{name}:密码输入正确')
self.login_state=True
withdraw_amount=float(input(f'{name}:请输入取出金额'))
if withdraw_amount>0:
if withdraw_amount>self.amount:
print(f'{name}:余额不足')
else:
self.amount-=withdraw_amount
print(f'{name}:已取出{withdraw_amount}')
else:
print(f'{name}:不合法数据')
else:
print(f'{name}:密码输入错误')
elif self.login_state==True:
print(f'{name}:已处于登录(Debug)状态')
withdraw_amount=float(input(f'{name}:请输入取出金额'))
if withdraw_amount>0:
if withdraw_amount>self.amount:
print(f'{name}:余额不足')
else:
self.amount-=withdraw_amount
print(f'{name}:已取出{withdraw_amount}')
else:
print(f'{name}:不合法数据')
def get_balance(self):
"""Return account balance.\n查看账户余额。"""
name='余额查询'
if self.login_state==False:
psw=input(f'{name}:请输入密码\n')
if psw == self.pin:
print(f'{name}:密码输入正确')
self.login_state=True
self.amount_view='%.2f'%self.amount
print(f'{name}:账户余额：{self.amount_view}')
else:
print(f'{name}:密码输入错误')
else:
print(f'{name}:已处于登录(Debug)状态')
self.amount_view='%.2f'%self.amount
print(f'{name}:账户余额：{self.amount_view}')
def change_pin(self):
"""Change pin from oldpin to newpin.\n将旧密码改为新密码"""
name='密码重置'
oldpin=input(f'{name}:请输入旧密码\n')
if oldpin == self.pin:
print(f'{name}:密码输入正确')
newpin=input(f'{name}:请输入新密码\n')
self.pin=newpin
self.login_state=False
else:
print(f'{name}:密码输入错误')
example = BankAccount('reforge3074')
example.deposit()
example.get_balance()
example.withdraw()
example.get_balance()
example.change_pin()
example.get_balance()存款系统:密码输入正确
存款系统:已存入2001.1
余额查询:已处于登录(Debug)状态
余额查询:账户余额：2001.10
取款系统:已处于登录(Debug)状态
取款系统:已取出1022.3
余额查询:已处于登录(Debug)状态
余额查询:账户余额：978.80
密码重置:密码输入正确
余额查询:密码输入正确
余额查询:账户余额：978.80Last updated