需求： 实现普通用户和管理员的操作
普通用户只能对自身进行金额变动，以及帐号信息的修改
管理员可以发信卡号，冻结卡号，修改指定帐号的额度等等
指定还款日
指定出账单日，定期出账单
由于当前水平有限，仅依靠文本操作和函数实现需求
流程图如下：
主函数：
1 all_card_bill() 2 exit_ = False 3 while not exit_: 4 a = input('1：信用卡中心；2：信用卡后台管理；3：退出 >>>') 5 if a == '3': 6 exit_ = True 7 continue 8 if a == '1': 9 credit_card() 10 if a == '2': 11 manage()
登录：
def credit_card_login(card_num, password): global LOGIN_ED_CARD, LIMIT, BALANCE, AUTHORITY, STATUS f = open('credit_card_msg', 'r') for line in f: if card_num == line.strip().split()[0] and password == line.strip().split()[1]: LOGIN_ED_CARD = True LIMIT = float(line.strip().split()[2]) BALANCE = float(line.strip().split()[3]) AUTHORITY = line.strip().split()[4] STATUS = line.strip().split()[5] return True if not LOGIN_ED_CARD: print('卡号或者密码错误')
登录验证：
def wrapper_credit_login(fuc): def inner(*args, **kwargs): if LOGIN_ED_CARD: return fuc(*args, **kwargs) else: times = 0 while times < 3: times += 1 dic_['card_num'] = input('请输入信用卡卡号：').strip() dic_['password'] = input('请输入密码：').strip() if credit_card_login(dic_['card_num'], dic_['password']): return fuc(*args, **kwargs) if times >= 3: print('错误次数达到3次，bye') return inner
权限验证，仅在进行管理员操作时才会执行：
def wrapper_authority(fuc): def inner(*args, **kwargs): if AUTHORITY == 'admin': return fuc(*args, **kwargs) else: print('权限不够') return inner
信用卡中心：
1 @wrapper_credit_login 2 def credit_card(): 3 if STATUS == 'frozen': 4 print('您的帐号已被冻结，请联系客服') 5 return 6 print('尊敬的', dic_['card_num']) 7 exit_flag = False 8 while not exit_flag: 9 choose = input('1：我的信用卡，2：还款，3：转账，4：提现，5返回 >>>').strip() 10 if choose == '5': 11 exit_flag = True 12 continue 13 if choose == '1': 14 my_card() 15 if choose == '2': 16 pay_back() 17 if choose == '3': 18 transfer_accounts() 19 if choose == '4': 20 get_cash()
mycard:
def my_card(): exit_flag = False while not exit_flag: choose = input('1：查看信用额度：，2：查看可用额度，3：查看流水明细，4：查询最近的账单，5：修改密码，6：返回 >>>') if choose == '6': exit_flag = True continue if choose == '1': print('您的信用额度为', LIMIT) if choose == '2': print('您的可用额度为', BALANCE) if choose == '3': check_transaction_detail() if choose == '4': check_bill() if choose == '5': change_password()
信用额度、可用额度是作为全局变量的，用户登录之后被赋值，有变动就与文件同步更新
查看流水明细：
def check_transaction_detail(): if os.path.exists(dic_['card_num'] + '_transaction_detail'): list_ = [] f = open(dic_['card_num'] + '_transaction_detail', 'r') for line in f: list_.append(line) f.close() if len(list_) < 2: print('您还没有交易进出记录') else: for line in list_: if line.strip().startswith('cred'): print('存入', '支出', '交易日期') continue print(line) else: f = open(dic_['card_num'] + '_transaction_detail', 'x') line = 'cred' + ' ' + 'debt' + ' ' + 'tran_date' + ' ' f.write(line) f.close() print('您还没有交易进出记录')
查看最近一期的账单
def check_bill(): if os.path.exists(dic_['card_num']+'_bill'): f = open(dic_['card_num']+'_bill', 'r') lines = f.readlines() target_line = lines[-1] print('尊敬的', dic_['card_num'], '您最近的一期账单如下') print('信用额度' + ' ' + '可用余额' + ' ' + '账单日期' + ' ' + '到期还款日' + ' ' + '上期账单金额' + ' ' + '支出总计' + ' ' + '存入总计' + ' ' + '本期应还金额' + ' ' + '最低还款额') print(target_line.strip()) else: print('尊敬的', dic_['card_num'], '您还没有生成的账单')
修改密码：
def change_password(): dic_['card_num_again'] = input('请输入信用卡号：').strip() dic_['password_again'] = input('请输入密码：').strip() if dic_['card_num'] == dic_['card_num_again'] and dic_['password'] == dic_['password_again']: dic_['new_password'] = input('请输入新密码：') dic_['new_password_again'] = input('请再次输入新密码：') if dic_['new_password_again'] == dic_['new_password']: dic_['password'] = dic_['new_password'] list_ = [] f = open('credit_card_msg', 'r') for line in f: if line.strip().split()[0] == dic_['card_num']: card_num = line.strip().split()[0] password = dic_['password'] limit = line.strip().split()[2] authority = line.strip().split()[3] status = line.strip().split()[4] new_line = (card_num + ' ' + password + ' ' + limit + ' ' + authority + ' ' + status + ' ') list_.append(new_line) continue list_.append(line) f.close() f = open('credit_card_msg', 'w') f.writelines(list_) f.close() print('您的密码已重新设置：请牢记', dic_['password']) else: print('您的两次密码输入不一样') else: print('您输入的卡号或密码不正确')
存款：
def pay_back(): global BALANCE exit_flag = False while not exit_flag: choose = input('1:查看最近账单，2：存款，3：返回 >>>').strip() if choose == '3': exit_flag = True continue if choose == '1': check_bill() if choose == '2': last_step = False while not last_step: money_payback = input('[b=back]请输入存款金额 >>>').strip() if money_payback == 'b' or money_payback == 'back': last_step = True continue if money_payback.isdigit(): money_payback = float(money_payback) BALANCE += money_payback list_ = [] f = open('credit_card_msg', 'r') for line in f: if line.strip(): if line.strip().split()[0] == dic_['card_num']: balance = float(line.strip().split()[3]) + money_payback new_line = (line.strip().split()[0] + ' ' + line.strip().split()[1] + ' ' + line.strip().split()[2] + ' ' + str(balance) + ' ' + line.strip().split()[4] + ' ' + line.strip().split()[5] + ' ') list_.append(new_line) continue list_.append(line) f.close() f = open('credit_card_msg', 'w') f.writelines(list_) f.close() now_times = TODAY line = str(money_payback) + ' ' + '0.0' + ' ' + now_times + ' ' if os.path.exists(dic_['card_num'] + '_transaction_detail'): f = open(dic_['card_num'] + '_transaction_detail', 'a') f.write(line) f.close() else: f = open(dic_['card_num'] + '_transaction_detail', 'w') line_ = 'cred' + ' ' + 'debt' + ' ' + 'datetime' + ' ' f.write(line_) f.write(line) f.close() print('您已于', now_times, '存入金额：', money_payback, ' 输入金额继续存款，输入b或者back退出')
转账的话，涉及到两个账户的操作，因此两个账户的数据都得同步
转账：
def transfer_accounts(): global BALANCE exit_flag = False while not exit_flag: choose = input('1:查看剩余额度，2：转账，3：返回 >>>').strip() if choose == '3': exit_flag = True continue if choose == '1': print('您当前剩余额度为：', BALANCE) if choose == '2': last_step = False while not last_step: transfer_card_num = input('[b=back]请输入对方卡号： >>>').strip() if transfer_card_num == 'b' or transfer_card_num == 'back': last_step = True continue else: find = False f = open('credit_card_msg', 'r') for line in f: if line.strip(): if line.strip().split()[0] == transfer_card_num: find = True break if not find: print('卡号不存在，请核对再输入') continue f.close() transfer_money = input('[b=back]请输入转账金额 >>>').strip() if transfer_money == 'b' or transfer_money == 'back': last_step = True continue if transfer_money.isdigit(): transfer_money = float(transfer_money) if transfer_money < BALANCE: BALANCE -= transfer_money list1 = [] f = open('credit_card_msg', 'r') for line1 in f: if line1.strip(): if line1.strip().split()[0] == dic_['card_num']: newline = (line1.strip().split()[0] + ' ' + line1.strip().split()[1] + ' ' + line1.strip().split()[2] + ' ' + str(BALANCE) + ' ' + line1.strip().split()[4] + ' ' + line1.strip().split()[5] + ' ') list1.append(newline) continue list1.append(line1) f.close() f = open('credit_card_msg', 'w') f.writelines(list1) f.close() list2 = [] f = open('credit_card_msg', 'r') for line2 in f: if line2.strip(): if line2.strip().split()[0] == transfer_card_num: balance = float(line2.strip().split()[3]) balance += transfer_money newline1 = (line2.strip().split()[0] + ' ' + line2.strip().split()[1] + ' ' + line2.strip().split()[2] + ' ' + str(balance) + ' ' + line2.strip().split()[4] + ' ' + line2.strip().split()[5] + ' ') list2.append(newline1) continue list2.append(line2) f.close() f = open('credit_card_msg', 'w') f.writelines(list2) f.close() now_times = TODAY line_add = '0.0' + ' ' + str(transfer_money) + ' ' + now_times + ' ' if os.path.exists(dic_['card_num'] + '_transaction_detail'): f = open(dic_['card_num'] + '_transaction_detail', 'a') f.write(line_add) f.close() else: f = open(dic_['card_num'] + '_transaction_detail', 'w') line_add_2 = 'cred' + ' ' + 'debt' + ' ' + 'datetime' + ' ' f.write(line_add_2) f.write(line_add) f.close() line_add_transfer_card_num = str(transfer_money) + ' ' + '0.0' + ' ' + now_times + ' ' if os.path.exists(transfer_card_num + '_transaction_detail'): f = open(transfer_card_num + '_transaction_detail', 'a') f.write(line_add_transfer_card_num) f.close() else: f = open(transfer_card_num + '_transaction_detail', 'w') line_add_transfer_card_num_2 = 'cred' + ' ' + 'debt' + ' ' + 'datetime' + ' ' f.write(line_add_transfer_card_num_2) f.write(line_add) f.close() print('您已于', now_times, '向账户', transfer_card_num, '转入金额', transfer_money) print('输入卡号继续转账，输入b或者back返回') else: print('转账金额超过可用余额上限') continue
提现：
def get_cash(): global BALANCE exit_flag = False while not exit_flag: choose = input('1：查看可用额度，2：提现，3：返回 >>>') if choose == '3': exit_flag = True continue if choose == '1': print('您目前可用额度为：', BALANCE) if choose == '2': cash = input('[b=back]请输入提现金额：') if cash == 'b' or cash == 'back': continue if cash.isdigit(): cash = float(cash) if cash*1.05 <= BALANCE: poundage = cash*0.05 money = cash + poundage BALANCE -= money list_ = [] f = open('credit_card_msg', 'r') for line in f: if line.strip(): if line.strip().split()[0] == dic_['card_num']: newline = (dic_['card_num'] + ' ' + line.strip().split()[1] + ' ' + line.strip().split()[2] + ' ' + str(BALANCE) + ' ' + line.strip().split()[4] + ' ' + line.strip().split()[5] + ' ') list_.append(newline) continue list_.append(line) f.close() f = open('credit_card_msg', 'w') f.writelines(list_) f.close() now_times = TODAY line_add = '0.0' + ' ' + str(money) + ' ' + now_times + ' ' if os.path.exists(dic_['card_num'] + '_transaction_detail'): f = open(dic_['card_num'] + '_transaction_detail', 'a') f.write(line_add) f.close() else: f = open(dic_['card_num'] + '_transaction_detail', 'w') line_add_2 = 'cred' + ' ' + 'debt' + ' ' + 'datetime' + ' ' f.write(line_add_2) f.write(line_add) f.close() print('您已成功提现金额：', cash) print('扣除手续费：', poundage) else: print('可用额度不足')
以上为普通用户的操作
后台管理：
@wrapper_credit_login @wrapper_authority def manage(): print('尊敬的admin') exit_flag = False while not exit_flag: choose = input('1：发卡，2：查看用户信息，3：冻结信用卡，4：修改用户密码，5：修改用户额度，6：返回 >>>') if choose == '6': exit_flag = True continue if choose == '1': card_add() if choose == '2': card_user_msg() if choose == '3': card_frozen() if choose == '4': user_card_password_change() if choose == '5': user_card_limit_change()
发卡：
def card_add(): exit_flag = False while not exit_flag: choose = input('1：发行普通用户（额度：15000.0），2：发行高级用户（额度：30000.0），' '3：特殊用户（额度：自定义），4：返回 >>>') if choose == '4': exit_flag = True continue if choose == '1': card_add_choose('normal') if choose == '2': card_add_choose('high') if choose == '3': card_add_choose('special')
冻结信用卡：
def card_frozen(): exit_flag = False while not exit_flag: card_num = input('[b=back]请输入要冻结的卡号： >>>').strip() if card_num == 'b' or card_num == 'back': exit_flag = True continue list_ = [] find = False f = open('credit_card_msg', 'r') for line in f: if line.strip().split()[0] == card_num: card_user_password = line.strip().split()[1] limit = line.strip().split()[2] balance = line.strip().split()[3] authority = line.strip().split()[4] status = 'frozen' new_line = (card_num + ' ' + card_user_password + ' ' + limit + ' ' + balance + ' ' + authority + ' ' + status + ' ') list_.append(new_line) find = True continue list_.append(line) f.close() if find: f = open('credit_card_msg', 'w') f.writelines(list_) f.close() print('卡号', card_num, '已被冻结') else: print('卡号', card_num, '不存在')
修改用户密码：
def user_card_password_change(): exit_flag = False while not exit_flag: card_num = input('[b=back]请输入要修改密码的卡号： >>>').strip() if card_num == 'b' or card_num == 'back': exit_flag = True continue find = False list_ = [] card_user_password = None f = open('credit_card_msg', 'r') for line in f: if line.strip().split()[0] == card_num: flag = True find = True while flag: card_user_password = input('请输入新密码：').strip() card_user_password_again = input('请再次输入：').strip() if card_user_password == card_user_password_again: limit = line.strip().split()[2] balance = line.strip().split()[3] authority = line.strip().split()[4] status = line.strip().split()[5] new_line = (card_num + ' ' + card_user_password + ' ' + limit + ' ' + balance + ' ' + authority + ' ' + status + ' ') list_.append(new_line) flag = False continue else: print('两次密码输入不一样') continue if not flag: continue list_.append(line) f.close() if find: f = open('credit_card_msg', 'w') f.writelines(list_) f.close() print('密码已被修改，请牢记', card_user_password) else: print('卡号不存在')
修改用户额度：
def user_card_limit_change(): exit_flag = False while not exit_flag: card_num = input('[b=back]请输入用户卡号： >>>').strip() if card_num == 'b' or card_num == 'back': exit_flag = True continue limit = None balance = None authority = None status = None find = False list_ = [] f = open('credit_card_msg', 'r') for line in f: if line.strip().split()[0] == card_num: flag = True while flag: limit = input('请设置额度: >>>') if limit.isdigit(): limit = float(limit) limit_before = float(line.strip().split()[2]) num = limit - limit_before password = line.strip().split()[1] balance = float(line.strip().split()[3]) balance += num authority = line.strip().split()[4] status = line.strip().split()[5] new_line = (card_num + ' ' + password + ' ' + str(limit) + ' ' + str(balance) + ' ' + authority + ' ' + status + ' ') list_.append(new_line) find = True flag = False continue else: print('额度输入不合法') if not flag: continue list_.append(line) f.close() if find: f = open('credit_card_msg', 'w') f.writelines(list_) f.close() print('用户额度已重新设置：') print('卡号：', card_num, '信用额度：', limit, '可用额度：', balance, '权限：', authority, '信用卡状态：', status) else: print('卡号不存在')
以上为管理员操作部分
其实这个作业最难处理的应该是出账单，涉及到日期、公式，而且涉及的文件操作也非常繁琐
在指定日期，迭代文件中的用户，就会生成对应的账单
账单函数：
def bill_get(card_num, card_limit, card_balance): if os.path.exists(card_num+'_bill'): f = open(card_num+'_bill', 'r') lines = f.readlines() f.close() target_line = lines[-1] limit = float(target_line.strip().split()[0]) # 额度上限 ，通常不变 datetime_ = YEAR + '-' + MONTH + '-' + '1' # 本期账单日期，固定 due_date = YEAR+'-' + MONTH + '-' + '15' # 本期还款日， 固定 balance_bef = float(target_line.strip().split()[7]) # 上期账单应还金额， 固定 payments = 0.0 # 本期存入，可能变化 new_charge = 0.0 # 本期支出， 可能变化 current_balance = 0.0 # 本期应还(实时账单余额)，此处可能会变动，balance参数受影响 min_payment = float(target_line.strip().split()[8]) # 此处为上期账单最小还款额，用完覆盖放入本期 payments_1 = 0.0 # 还款日之前存入金额 payments_2 = 0.0 # 还款日之后存入金额 datetime_last = target_line.strip().split()[2] # 上个账单日期 list_cost = [] # 从临时文件中找出上期账单的支出记录分别对应的日期 ，利息的计算= 未还金额 * 天数 if os.path.exists(card_num + '_temporary'): f = open(card_num+'_temporary', 'r') for line in f: if line.strip(): list_cost.append(line) f.close() if os.path.exists(card_num+'_transaction_detail'): min_payment_enough_date = '' # 找出还够最小还款额的日期 ，以便计算利息天数 list_temp = [] # 本期交易记录，找出来放入临时文件 list_ = [] f = open(card_num+'_transaction_detail', 'r') find = False # 是否找到达到最小还款额的日期 for line in f: if line.strip().startswith('cred'): list_.append(line) continue if line.strip().endswith('reckoned'): list_.append(line) continue if line.strip(): if MONTH == '1': if (line.strip().split()[2]).strip().split('-')[1] == '12' and int((line.strip().split()[2]).strip().split('-')[2]) <= 15: new_line = line.strip().split()[0] + ' ' + line.strip().split()[1] + ' ' + line.strip().split()[ 2] + ' ' + 'reckoned' + ' ' list_.append(new_line) list_temp.append(line) payments_1 += float(line.strip().split()[0]) # 还款日之前存入 if not find and payments_1 > min_payment: min_payment_enough_date = line.strip().split()[2] find = True new_charge += float(line.strip().split()[1]) continue if (line.strip().split()[2]).strip().split('-')[1] == str(int(MONTH)-1) and int((line.strip().split()[2]).strip().split('-')[2]) <= 15: list_temp.append(line) new_line = line.strip().split()[0] + ' ' + line.strip().split()[1] + ' ' + line.strip().split()[ 2] + ' ' + 'reckoned' + ' ' list_.append(new_line) payments_1 += float(line.strip().split()[0]) # 还款日之前存入 if not find and payments_1 > min_payment: min_payment_enough_date = line.strip().split()[2] find = True new_charge += float(line.strip().split()[1]) continue new_line = line.strip().split()[0] + ' ' + line.strip().split()[1] + ' ' + line.strip().split()[ 2] + ' ' + 'reckoned' + ' ' payments_2 += float(line.strip().split()[0]) # 还款日之后存入 list_temp.append(line) list_.append(new_line) payments += float(line.strip().split()[0]) new_charge += float(line.strip().split()[1]) continue list_.append(line) f.close() f = open(card_num+'_temporary', 'w') # 将本期交易记录放入临时文件 f.writelines(list_temp) f.close() f = open(card_num+'_transaction_detail', 'w') f.writelines(list_) f.close() def interest(day_num, money): # 利息计算公式 ret = money * day_num * 0.0005 ret = round(ret, ndigits=2) return ret if payments_1 > balance_bef: # 全额还款,计算支出new_charge， 得到应还金额 current_balance = balance_bef + new_charge - payments_1 - payments_2 elif payments_1 > min_payment: # 达到最小还款额，计算(上期应还-payments_1-payments_2+利息+new_charge)得出本期应还 num = 0.00 # 最低还款日之前利息 for line in list_cost: cost_money = float(line.strip().split()[1]) date_cost = line.strip.split()[2] year = date_cost.strip().split('-')[0] month = date_cost.strip().split('-')[1] day_cost = date_cost.strip().split('-')[2] day1 = datetime.datetime(year, month, day_cost) # 每一个消费日 year_1 = datetime_last.strip().split('-')[0] month_1 = datetime_last.strip().split('-')[1] day_1 = datetime_last.strip().split('-')[2] day2 = datetime.datetime(year_1, month_1, day_1) # 上一个账单日 day_dec = int(day2) - int(day1) num += interest(day_dec, cost_money) # 每一个消费日到上一个账单日那一天的利息累加 , 如果不存在支出,num 依然等于 0 year = datetime_last.strip().split('-')[0] month = datetime_last.strip().split('-')[1] day = datetime_last.strip().split('-')[0] day1 = datetime.datetime(year, month, day) # 上一个账单日 day2 = datetime.datetime(min_payment_enough_date.split('-')[0], # 还款日 min_payment_enough_date.split('-')[1], min_payment_enough_date.split('-')[2]) day_dec = int(day2) - int(day1) num_1 = interest(day_dec, balance_bef) # 上一个账单日到最低还款额那一天的利息累加 num += num_1 # 最低还款额那一天之前的总利息 day3 = datetime.datetime(min_payment_enough_date.split('-')[0], min_payment_enough_date.split('-')[1], min_payment_enough_date.split('-')[2]) year_datetime_ = datetime_.strip().split()[0] month_datetime_ = datetime_.strip().split()[1] day_datetime_ = datetime_.strip().split()[2] day4 = datetime.datetime(year_datetime_, month_datetime_, day_datetime_) day_dec = int(day4) - int(day3) num2 = interest(day_dec, balance_bef-payments_1) # 最低还款额日期之后的利息 interest_all = num + num2 # 总共的利息 current_balance = balance_bef - payments_1 - payments_2 + interest_all + new_charge # 本期应还金额 else: # 未达到最小还款额，全额罚息，上期应还-payments_1-payments_2+全额利息+(min_payment-payments_1) 的滞纳金 + new_charge,得出本期应还 num = 0.0 for line in list_cost: cost_money = float(line.strip().split()[1]) date_cost = line.strip.split()[2] year = date_cost.strip().split('-')[0] month = date_cost.strip().split('-')[1] day_cost = date_cost.strip().split('-')[2] day1 = datetime.datetime(year, month, day_cost) # 每一笔消费的日期 year_1 = datetime_last.strip().split('-')[0] month_1 = datetime_last.strip().split('-')[1] day_1 = datetime_last.strip().split('-')[2] day2 = datetime.datetime(year_1, month_1, day_1) # 上一个账单日 day_dec = int(day2) - int(day1) num += interest(day_dec, cost_money) # 每一笔消费到上一个账单日的利息累加 , 如果不存在支出，num依然等于 0 year_2 = datetime_last.split('-')[0] month_2 = datetime_last.split('-')[1] day_2 = datetime_last.split('-')[2] day1 = datetime.datetime(year_2, month_2, day_2) # 上个账单日 day2 = datetime.datetime(datetime_.split('-')[0], datetime_.split('-')[1], datetime_.split('-')[2]) # 这个账单日 day_dec = int(day2) - int(day1) num2 = interest(day_dec, balance_bef) # 上个账单日到这个账单日的利息 interest_all = num + num2 # 总利息 fee_late = (min_payment - payments_1)*0.05 # 滞纳金 current_balance = balance_bef + interest_all + fee_late + new_charge - payments_1 - payments_2 # 本期应还金额 if current_balance > 0: min_payment = round(current_balance/10, ndigits=2) else: min_payment = 0.0 payments = payments_1 + payments_2 balance = limit - current_balance if balance <= 0: balance = 0.0 list_ = [] f = open('credit_card_msg', 'r') # 更新balance for line in f: if line.strip(): if line.strip().split()[0] == card_num: new_line = (card_num + ' ' + line.strip().split()[1] + ' ' + card_limit + ' ' + str(balance) + ' ' + line.strip().split()[4] + ' ' + line.strip().split()[5] + ' ') list_.append(new_line) continue list_.append(line) f.close() f = open('credit_card_msg', 'w') f.writelines(list_) print_card_num_bill = card_num+'的本期账单如下' print(print_card_num_bill.center(60, '-')) print('信用额度' + ' ' + '可用余额' + ' ' + '账单日期' + ' ' + '到期还款日' + ' ' + '上期账单金额' + ' ' + '支出总计' + ' ' + '存入总计' + ' ' + '本期应还金额' + ' ' + '最低还款额') f.close() line_add = (card_limit + ' ' + str(balance) + ' ' + datetime_ + ' ' + due_date + ' ' + str(balance_bef) + ' ' + str(new_charge) + ' ' + str(payments) + ' ' + str(current_balance) + ' ' + str(min_payment) + ' ') print(line_add) f = open(card_num+'_bill', 'a') f.write(line_add) f.close() else: limit = card_limit balance = card_balance datetime_ = YEAR+'-'+MONTH+'-'+'1' due_date = YEAR+'-'+MONTH+'-'+'15' balance_bef = 0.0 payments = 0.0 new_charge = 0.0 current_balance = 0.0 min_payment = 0.0 if os.path.exists(card_num+'_transaction_detail'): f = open(card_num+'_transaction_detail', 'r') list_ = [] list_1 = [] for line in f: if line.strip().startswith('cred'): list_.append(line) continue if line.strip(): list_1.append(line) payments += float(line.strip().split()[0]) new_charge += float(line.strip().split()[1]) new_line = (line.strip().split()[0] + ' ' + line.strip().split()[1] + ' ' + line.strip().split()[2] + ' ' + 'reckoned'+' ') list_.append(new_line) continue list_.append(line) list_1.append(line) f.close() with open(card_num+'_transaction_detail', 'w') as f, open(card_num+'_temporary', 'w') as f1: f.writelines(list_) f1.writelines(list_1) if new_charge > payments: current_balance = new_charge - payments min_payment = round(current_balance/10) min_payment = float(min_payment) f = open(card_num+'_bill', 'w') line = ('limit' + ' ' + 'balance' + ' ' + 'datetime' + ' ' + 'due_date' + ' ' + 'balance_b/f' + ' ' + 'new_charge' + ' ' + 'payments' + ' ' + 'current_balance' + ' ' + ' min_payment' + ' ') line_1 = (limit + ' ' + balance + ' ' + datetime_ + ' ' + due_date + ' ' + str(balance_bef) + ' ' + str(new_charge) + ' ' + str(payments) + ' ' + str(current_balance) + ' ' + str(min_payment) + ' ') f.write(line) f.write(line_1) f.close() print_card_num_bill = card_num + '的本期账单如下' print(print_card_num_bill.center(60, '-')) print('信用额度' + ' ' + '可用余额' + ' ' + '账单日期' + ' ' + '到期还款日' + ' ' + '上期账单金额' + ' ' + '支出总计' + ' ' + '存入总计' + ' ' + '本期应还金额' + ' ' + '最低还款额') print(line_1) print('------------------------------------------------') if os.path.exists(card_num + '_temporary'): f = open(card_num+'_temporary', 'r') list_2 = [] for line in f: if line.strip(): list_2.append(line) f.close() if list_2: print('存入', '支出', '交易日期') for line in list_2: print(line.strip()) else: print(card_num, '还没有产生任何交易')