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 datetime
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"]
book_info1 = [1, "红楼梦", "图书馆A1", "人文", 1, 22, datetime.datetime(2018, 1, 1), datetime.datetime(2018, 1, 1), 1, "可借"]
book_info2 = [2, "西游记", "图书馆A2", "人文", 1, 22, datetime.datetime(2018, 1, 1), datetime.datetime(2018, 1, 1), 2, "可借"]
book_info3 = [3, "水浒传", "图书馆A3", "人文", 1, 22, datetime.datetime(2018, 1, 1), datetime.datetime(2018, 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_info
print("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(2018, 1, 1)
if do_now == 1:
print("1.添加书")
the_add_book = []
for info in book_info:
# int
if info in ["索引", "数量", "价格", "次数"]:
put_number = int(input(info + ":"))
the_add_book.append(put_number)
# datetime
elif 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])))
# str
else:
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] + 1
if _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] + 1
if _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])