Python program to add delete and display all record of binary file

Write a Python program to Perform Add, Delete and Display Record operation on binary file

import pickle
def showData():
    stu={}
    fp=open("stu.dat","rb")
    print("Roll\tName\tCity")
    flag=False
    try:
        while True:
            stu=pickle.load(fp)
            #print(emp1)
            print(stu['roll'],'\t',stu['name'],'\t',stu['city'])
    except EOFError:    
        fp.close()
def deleteData():
    stu={}
    fp=open("stu.dat","rb")
    r=int(input("Enter the Roll No. for Delete : "))
    l1=[]
    flag=False
    try:
        while True:
            stu=pickle.load(fp)
            #print(emp1)
            if stu['roll']!=r:
                #print(stu['roll'],'\t',stu['name'],'\t',stu['city'])
                l1.append(stu)
                flag=True            
    except EOFError:    
        fp.close()
    if flag==False:
        print("Record Not Found " )
    else:
        print("Record Deleted" )
        fp=open("stu.dat","wb")
        for a in l1:
            pickle.dump(a,fp)
        fp.close()
    
def searchData():
    stu={}
    fp=open("stu.dat","rb")
    r=int(input("Enter the Roll No. for Search : "))
    flag=False
    try:
        while True:
            stu=pickle.load(fp)
            #print(emp1)
            if stu['roll']==r:
                print(stu['roll'],'\t',stu['name'],'\t',stu['city'])
                flag=True
                break
    except EOFError:    
        fp.close()
    if flag==False:
        print("Record Not Found " )
def addData():
    stu={}
    fp=open("stu.dat","ab")
    while True:
        r=int(input("Enter Roll No : "))
        n=input("Enter name")
        c=input("Enter  City")
        stu['roll']=r
        stu['name']=n
        stu['city']=c
        pickle.dump(stu,fp)
        a=input("if you want to add more data press Y")
        if a not in ['Y','y']:
            break
    fp.close()
while True:
    print("1. Add New Student\n2.Print List of Student\n 3.Search any Student\n4.Delete Record \n5.Exit")
    ch=int(input("Enter Your Choice : "))
    if ch==1:
        addData()
    elif ch==2:
        showData()
    elif ch==3:
        searchData()
    elif ch==4:
        deleteData()
    elif ch==5:
        break
    else:
        print("Invalid Choice ")