图书管理系统
功能简介
- 添加图书时，图书ID不能重复，图书名可重复
- 删除，查询，修改功能，输入图书名之后提供所有的同名的图书，用户可以按照图书序号对具体的一本书进行操作
- 显示书籍，分行显示，每行一本书的信息
书籍信息以如下格式保存在txt文本文件下
{"book_id":"001","book_name":"三体","book_loc":"0-0-1"}
{"book_id":"002","book_name":"三体","book_loc":"0-0-2"}
源代码
#-*- coding=utf8 -*-
# @author:sololi
# date: 2020/11/12
# 文件说明 : data 为存储的图书信息
import sys
def print_muen():
print("----菜单提示----")
print("[1]:添加图书")
print("[2]:查询图书")
print("[3]:删除图书")
print("[4]:修改图书信息")
print("[5]:显示所有图书")
print("[6]:退出")
def add_book():
book_id=input("请输入图书编号")
book_name=input("请输入图书名称")
book_loc=input("请输入图书位置")
for i in books:
if book_id==i["book_id"]:
print("编号重复")
break
else:
book={}
book["book_id"]=book_id
book["book_name"]=book_name
book["book_loc"]=book_loc
books.append(book)
new_file(books)
print("添加成功")
def find_book():
jg=0
while True:
book_name=input("输入要找的书名")
for i in books:
if book_name==i["book_name"]:
print(i)
jg=1
if jg==0:
print("查找失败请重新输入")
continue
elif jg==1:
break
def dell_book():
book_name =input("请输入图书书名")
i=0
j=0
jg=0
flag=[]
while i<len(books):
if books[i]["book_name"]==book_name:
id=books[i]["book_id"]
flag.append(id)
print("图书编号:{}".format(id))
jg=1
i+=1
if jg==0:
print("找不到图书名")
if jg==1:
book_id=input("请输入删除的图书编号")
i=0
while j < len(flag):
if flag[j] == book_id:
while i < len(books):
if books[i]["book_id"] == book_id:
del books[i]
new_file(books)
print("删除成功")
break
i+=1
break
j+=1
else:
print("输入的编号有误")
return books
def modify_book():
book_name = input("请输入修改的图书名称")
i = 0
jg = 0
flag = []
while i < len(books):
if books[i]["book_name"] == book_name:
id = books[i]["book_id"]
flag.append(id)
print("本书图书编号:{}".format(id))
jg = 1
i += 1
if jg == 0:
print("找不到图书名")
elif jg == 1:
book_id = input("请输入修改的图书编号，或者其他需要修改的图书编号")
for i in books:
if book_id == i["book_id"]:
New_id = input("新的图书编号")
if New_id == i["book_id"]:
print("输入编号重复")
break
else:
New_name = input("新的图书名称")
New_loc = input("新的图书位置")
i["book_id"] = New_id
i["book_name"] = New_name
i["book_loc"] = New_loc
new_file(books)
break
else:
print("输入有误")
def all_book():
for i in books:
print(i)
def read_book(data):#将文本文件里的图书信息读取到books中
f = open(data, mode="r", encoding="utf8")
books = f.readlines()
f.close()
for i in range(0, len(books)):
books[i] = eval(books[i].replace("\n", ""))
return books
def new_file(books):#将books的内容更新到文本文件里
i=0
nf = open(data, 'w+',encoding='utf8') # 以清空原文本文件内容的方式打开文件写入
while i<len(books):
new=str(books[i])
nf.write(new)
if i !=len(books)-1:
nf.write("\n")
i+=1
nf.close()
if __name__=="__main__":#主要流程
data = str(input(r"请输入您的图书信息路径(例如：D:\books.txt):")) #读取数据信息
while True:
books=read_book(data)
print_muen()
choice=input("请输入您的选择")
if choice=='1':
add_book()
all_book()
elif choice=='2':
find_book()
elif choice=='3':
dell_book()
all_book()
elif choice=='4':
modify_book()
all_book()
elif choice == '5':
all_book()
elif choice == '6':
print("感谢您的使用")
sys.exit(0)
else:
print("您的输入有误,请重新输入")
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