import csv
def add():
    f=open('book.csv','a',newline='\n')
    d=csv.writer(f)
    d.writerow(['bookno','bookname','author','price'])
    while True:
        bookno=input('enter bookno')
        bname=input('enter book name')
        author=input('enter author')
        price=input('enter price')
        d.writerow([bookno,bname,author,price])
        ch=input('want to add more? y/n')
        if ch=='n':
            break
    f.close()
def show():
    f=open('book.csv','r')
    d=csv.reader(f)
    for i in d:
        print(i)
    f.close()

def search(p):
    f=open('book.csv','r')
    d=csv.reader(f)
    next(d)
    for i in d:
        if int(i[3])>=p:
            print(i)
    f.close()

    f.close()

while True:
    print('1.ADD Book ')
    print('2.Show all Books')
    print('3.Search Book')
    print('4 Exit')
    ch=int(input('enter choice'))
    if ch==1:
        add()
    elif ch==2:
        show()
    elif ch==3:
        n=int(input('enter price for book search'))
        search(n)
    elif ch==4:
        break
'''
OUTPUT
1.ADD Book 
2.Show all Books
3.Search Book
4 Exit
enter choice1
enter bookno1
enter book nameinformation
enter authork l sharma
enter price560
want to add more? y/ny
enter bookno2
enter book nametechnology
enter authors k arora
enter price700
want to add more? y/ny
enter bookno3
enter book namemathematics solver
enter authorshiv das
enter price400
want to add more? y/nn
1.ADD Book 
2.Show all Books
3.Search Book
4 Exit
enter choice3
enter price for book search500
['1', 'information', 'k l sharma', '560']
['2', 'technology', 's k arora', '700']
1.ADD Book 
2.Show all Books
3.Search Book
4 Exit
enter choice2
['bookno', 'bookname', 'author', 'price']
['1', 'information', 'k l sharma', '560']
['2', 'technology', 's k arora', '700']
['3', 'mathematics solver', 'shiv das', '400']
1.ADD Book 
2.Show all Books
3.Search Book
4 Exit
enter choice4
'''