python-记账小程序(80)

# 转自https://www.jianshu.com/c/00c61372c46a网址
#1,记账时手头有一万块钱
#2,可以记录花的钱，存的钱，以及收支明细

#wallet文件内存总的钱数，余额
#record文件内存的是明细


import pickle
import os
import time

def cost(wallet,record):    #记录花钱的函数
    amount = int(input('amount: ')) #输入数字
    comment = input('comment: ')    #输入
    date = time.strftime('%Y-%m-%d')
    with open(wallet,'rb') as fobj: #从文件取总值减去amount
        balance = pickle.load(fobj) - amount
    with open(wallet,'wb') as fobj:
        pickle.dump(balance,fobj)   #将上面得到的值再写入文件内
    with open(record,'a') as fobj:  #向record对应文件内追加各种信息
        fobj.write(
            '%-15s%-8s%-8s%-8s%-20s\n' % (date,'',amount,balance,comment)
        )

def save(wallet,record):    #记录存钱的函数
    amount = int(input('amount: '))
    comment = input('comment: ')
    date = time.strftime('%Y-%m-%d')
    with open(wallet,'rb') as fobj:
        balance = pickle.load(fobj) + amount
    with open(wallet,'wb') as fobj:
        pickle.dump(balance,fobj)
    with open(record,'a') as fobj:
        fobj.write(
            '%-15s%-8s%-8s%-8s%-20s\n' % (date,amount,'',balance,comment)
        )

def query(wallet,record):   #查询收支明细的函数
    print('%-15s%-8s%-8s%-8s%-20s' % ('date','save','cost','balance','comment'))
    with open(record) as fobj:  #输出明细
        for line in fobj:
            print(line,end='')
    with open(wallet,'rb') as fobj: #输出余额
        balance = pickle.load(fobj)
        print("Latest Balance: %d" % balance)

def show_menu():
    cmds = {'0':save,'1':cost,'2':query}
    prompt = """(0) save
(1) cost
(2) query
(3) exit
Please input your choice(0/1/2/3): """
    wallet = '/tmp/1wallet.data'
    record = '/tmp/1record.txt'
    if not os.path.exists(wallet):
        with open(wallet,'wb') as fobj: #如果/tmp/wallet.data不存在，则创建并写入数据10000
            pickle.dump(10000,fobj)

    while True:
        try:
            choice = input(prompt).strip()[0]   #去除空格，选取第一个数字
        except ImportError:
            continue
        except (KeyboardInterrupt,EOFError):
            print()
            choice == '3'

        if choice not in '0123':
            print('Invalid input. Try again.')
            continue

        if choice == '3':
            break
        cmds[choice](wallet,record) #根据cmds字典和choice选择运行上面定义的函数即查询，花钱，存钱

if __name__ == '__main__':
    show_menu()