用类实现一个图书馆，实现借书，入库，还书，查书，等功能，要求数据可以保存到文件中，退出后下次可以找回数据
import traceback
import pickle
import os
import os.path
class Book(object):
def __init__(self,name,author,tag,price):
self.__name = name
self.__author = author
self.__tag = tag
self.__price = price
def get_book_name(self):
return self.__name
def set_book_name(self,new_name):
self.__name = new_name
def book_info(self):
print(self.name,self.author,self.tag,self.price)
class GRLibrary(object):
'''吴老师创建的创建的光荣之路图书馆！'''
def __init__(self,name,location):
self.name = name
self.location = location
self.book_list=[]
def get_library_info(self):
info = "名字：%s \n地点：%s" %(self.name,self.location)
return info
def add(self,book):
self.book_list.append(book)
print("%s图书入库成功" %book.get_book_name())
def list(self):
for book in self.book_list:
print(book.get_book_name())
def find(self):
book_name = input("请输入要查找输的名字：").strip()
for book in self.book_list:
if book_name ==book.get_book_name():
print("找到%s了！" %book_name)
break
else:
print("没找到%s！" %book_name)
def list_info():
print("""
图书馆可以输入如下命令进行操作：
create:创建图书馆
use：使用某个图书馆
add:增加图书
borrow:借阅图书
lend:还书
list:查看库中的图书列表
find:查看库中是否存在某本书
exit：退出
""")
library = None
def create():
global library
library_name= input("请输入图书馆的名字：").strip()
location = input("请输入图书馆的地址：").strip()
library = GRLibrary(library_name,location)
def add():
book_name=input("请输入书名：").strip()
author_name=input("请输入作者名：").strip()
tag= input("请输入书的分类：").strip()
price = input("请输入书的价格：").strip()
book= Book(book_name,author_name,tag,price)
if library is not None:
library.add(book)
print("%s 图书入库成功" %book_name)
else:
print("图书馆还未创建，请输入create进行创建！")
def list_book():
if library is not None:
library.list()
library_data_file_path =""
def use():
global library
global data_file_path
data_file_path = input("请输入图书馆数据文件的位置：").strip()
if os.path.exists(data_file_path):
try:
fp= open(data_file_path,"rb")
library=pickle.load(fp)
library_data_file_path = data_file_path
except:
print("图书馆的数据文件没有合法的数据！")
def find():
global library
if library is not None:
library.find()
command ={"create":"create","add":"add",
"list":"list_book","use":"use","find":"find"}
if __name__ == "__main__":
print(list_info())
while 1:
try:
user_command = input("请输入操作命令：").lower().strip()
if user_command=="exit":
if library_data_file_path == "":
library_data_file_path = input("请输入保存图书馆数据的数据文件路径：")
fp= open(library_data_file_path,"wb")
if library is not None:
pickle.dump(library,fp)
fp.close()
break
eval(command[user_command]+"()")
except:
traceback.print_exc()
if user_command not in command:
print("您输入命令不存在!")
else:
print("您输入的命令有误，请按照命令列表输入：")
print(list_info())
continue
