图书馆管理系统:

基于python系统

引用库进行操作

系统主要实现：

添加书删除书借书还书查询图书信息查询马上要归还的图书信息按照借阅次序排序

源码简介:

对已图书信息进行更新操作，包括添加和删除一种书的信息，修改图书信息（例如图书被借阅，书的数目减1，借阅次数加1，如果数量为0则状态为不可借）；通过按图书的名称查询图书信息；显示所有即将到期的图书进行排序；将图书的所有相关信息内容存为文件。

源码运用:

运用到了python知识，在Python中，lambda函数是使用lambda表达式定义的单行匿名函数。它常用于将函数作为参数传递等场景。lambda函数具有lambda<参数>:<表达式>的格式。它没有函数名，函数体只有一条语句，这条语句的结果就是该函数的返回值。

整个代码中反复使用了for循环

[:-1]是python特有的切片操作，也叫切割操作，这里的下标0表示左起第一个元素，-1表示倒数最后一个元素。取一个list或tuple的部分元素是非常常见的操作

mode=”w+”表示即可以写数据又可以读取数据

<小总结>

用来应付大一大二python课程设计绰绰有余

以下代码仅供参考!并不完整!

可以私信

(全天25小时在线)

import datetimebook_info = ["索引", "名称", "地址", "类别", "数量", "价格", "入库时间", "归还时间", "次数", "状态"]book_info1 = [1, "红楼梦", "图书馆A1", "人文", 1, 22, datetime.datetime(, 1, 1), datetime.datetime(, 1, 1), 1, "可借"]book_info2 = [2, "西游记", "图书馆A2", "人文", 1, 22, datetime.datetime(, 1, 1), datetime.datetime(, 1, 1), 2, "可借"]book_info3 = [3, "水浒传", "图书馆A3", "人文", 1, 22, datetime.datetime(, 1, 1), datetime.datetime(, 1, 1), 3, "可借"]all_book_info = [book_info1, book_info2, book_info3]def add_book(_book_info, mode="a+"):f = open(r'lib.txt', mode)print(_book_info, file=f)f.close()def renew_books(_all_books):for index, _book in enumerate(_all_books):if index == 0:add_book(_book, mode="w+")else:add_book(_book)def read_books():f = open(r'lib.txt', "r")_books_info = f.read()_books_info_str = _books_info.split("\n")[:-1]_return_info = []for _book in _books_info_str:_return_info.append(eval(_book))f.close()return _return_infoprint("1.添加书")print("2.删除书")print("3.借书")print("4.还书")print("5.查询图书信息")print("6.查询马上要归还的图书信息")print("7.按照借阅次数排序")print("************")do_now = int(input("你想做什么呢？(输入为数字)"))# book_info = ["索引", "名称", "地址", "类别", "数量", "价格", "入库时间", "归还时间", "次数", "状态"]# datetime.datetime(, 1, 1)if do_now == 1:print("1.添加书")the_add_book = []for info in book_info:# intif info in ["索引", "数量", "价格", "次数"]:put_number = int(input(info + ":"))the_add_book.append(put_number)# datetimeelif info in ["入库时间", "归还时间"]:put_date = input(info + ":(用逗号分开年月日)").split(",")the_add_book.append(datetime.datetime(int(put_date[0]), int(put_date[1]), int(put_date[2])))# strelse:put_txt = input(info + ":")the_add_book.append(put_txt)add_book(the_add_book)elif do_now == 2:# 读取所有书all_book_info = read_books()# 把所有书名打出for _book in all_book_info:print(_book[1])del_book_name = input("你想删除哪一本书？")# stay_book -> 最后留下来的书stay_book = []for _book in all_book_info:if del_book_name != _book[1]:stay_book.append(_book)renew_books(stay_book)elif do_now == 3:# 读取所有书all_book_info = read_books()# 把所有书名打出for _book in all_book_info:if "不" not in _book[-1]:print(_book[1])borrow_book_name = input("你想借哪一本书？")for _book in all_book_info:if borrow_book_name == _book[1]:_book[4] = _book[4] - 1_book[-2] = _book[-2] + 1if _book[4] == 0:_book[-1] = "不可借"renew_books(all_book_info)elif do_now == 4:# 读取所有书all_book_info = read_books()# 把所有书名打出for _book in all_book_info:print(_book[1])return_book_name = input("你想还哪一本书？")for _book in all_book_info:if return_book_name == _book[1]:_book[4] = _book[4] + 1if _book[4] == 1:_book[-1] = "可借"renew_books(all_book_info)elif do_now == 5:# 读取所有书all_book_info = read_books()# 把所有书名打出for _book in all_book_info:print(_book[1])search_book_name = input("你想查询哪一本书？")for _book in all_book_info:if search_book_name == _book[1]:print(_book)renew_books(all_book_info)elif do_now == 6:all_book_info = read_books()# 把所有书名打出for _book in all_book_info:# datetime.datetime.now() ->获取当前日期if datetime.datetime.now() - _book[-3] > datetimetimedelta(days=3):print(_book[1], datetime.datetime.now() - _book[-3])elif do_now == 7:all_book_info = read_books()all_book_info.sort(key=lambda x: x[-2] * -1)for _book in all_book_info:print(_book[1])