1、任务1：银行账户资金交易管理

import timeimport prettytable as ptbalance = 1000  # 初始化余额acount_log = [] # 初始化交易日志class Bank:    def __init__(self): """初始化""" global balance self.balance = balance self.acount_log = acount_log    def deposit(self): """存款""" amount = float(input('请输入存款金额：')) self.balance += amount self.write_log(amount,'转入')    def withdrawl(self): """取款""" amount = float(input('请输入取款金额：')) # 判断余额 if amount > self.balance:     print('余额不足') else:     self.balance -= amount     self.write_log(amount, '消费')    def print_log(self): """打印交易日志""" tb = pt.PrettyTable()  # 按行添加数据 # 设置表格头 tb.field_names = ["交易日期", "摘要", "金额", "币种", "余额"] for info  in self.acount_log:     # 判断转入还是消费，为金额前添加“+”或“-”     if info[1] == '转入':  amout = '+{}'.format(info[2])     else:  amout = '-{}'.format(info[2])     tb.add_row([info[0],info[1],amout,'人民币',info[3]]) print(tb)    def write_log(self,amout,handle): """写入日志""" # 获取创建时间。time.strftime获得当前时间，将时间格式化为字符串 create_time = time.strftime('%Y-%m-%d %H:%M:%S', \ time.localtime(time.time())) data = [create_time, handle, amout, self.balance]   # 组装列表 self.acount_log.append(data)    # 添加到日志列表def show_menu():    """显示菜单"""    menu = '''菜单    0：退出    1：存款    2：取款    3：打印交易详情    '''    print(menu)if __name__ == "__main__":    show_menu()    num = float(input('请根据菜单输入操作编号：'))    bank = Bank()    while num!= 0 : if num == 1:     bank.deposit() elif num == 2:     bank.withdrawl() elif num == 3:     bank.print_log() else:     print('您的输入有误！') num = float(input('请根据菜单输入操作编号：'))    print('您已退出系统')

2、任务2：设计药品medicine 类

from datetime import datetimeclass Medicine:    # 准备空集    name = ''    price = 0    PD = ''    Exp = ''    def __init__(self,name,price,PD,Exp): self.name = name self.price = price self.PD = PD self.Exp = Exp    def get_name(self): return self.name    def get_GP(self): start = datetime.strptime(self.PD, '%Y-%m-%d') end   = datetime.strptime(self.Exp, '%Y-%m-%d') return (end-start).daysmedicine = Medicine(name='格列宁',price=1860,\      PD='2018-5-1',Exp='2018-12-1')name = medicine.get_name()GP = medicine.get_GP()print('药品名称:{}'.format(name))print('药品保质期:{}天'.format(GP))