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Binary File – Exam based questions
A binary file “student.dat” has structure [rollno, name, marks]. i. Write a user defined function insertRec() to input data for a student and add to student.dat. ii. Write a function searchRollNo( r ) in Python which accepts the student’s rollno as parameter and searches the record in the file “student.dat” and shows the details of student i.e. rollno, name and marks (if found) otherwise shows the message as ‘No record found’.
(i) import pickle def insertRec(): f=open("student.dat","ab") rollno = int (input("Enter Roll Number : ")) name=input("Enter Name :") marks = int(input("Enter Marks : ")) rec = [rollno, name, marks ] pickle.dump( rec, f ) f.close() (ii) def searchRollNo( r ): f=open("student.dat","rb") flag = False while True: try: rec=pickle.load(f) if rec[0] == r : print(rec[‘Rollno’]) print(rec[‘Name’]) print(rec[‘Marks]) flag == True except EOFError: break if flag == False: print(“No record Found”) f.close()
A binary file “emp.dat” has structure [EID, Ename, designation, salary]. i. Write a user defined function CreateEmp() to input data for a record and create a file emp.dat. ii. Write a function display() in Python to display the detail of all employees whose salary is more than 50000. (i) import pickle def CreateEmp(): f1=open("emp.dat",'wb') eid=input("Enter E. Id") ename=input("Enter Name") designation=input("Enter Designation") salary=int(input("Enter Salary")) l=[eid,ename,designation,salary] pickle.dump(l,f1) f1.close() (ii) import pickle def display(): f2=open("emp.dat","rb") try: while True: rec=pickle.load(f2) if rec[3]>5000: print(rec[0],rec[1],rec[2],rec[3]) except: f2.close()
Write a python program to append a new records in a binary file – “student.dat”. The record can have Rollno, Name and Marks. import pickle while True: rollno = int(input("Enter your rollno: ")) name = input("Enter your name: ")
Write a python program to search and display the record of the student from a binary file “Student.dat” containing students records (Rollno, Name and Marks). Roll number of the student to be searched will be entered by the user.
marks = int(input("enter marks obtained: ")) d = [rollno, name, marks] f1 = open("Student.dat", "wb") pickle.dump(d, f1) choice = input("enter more records: y/n") if choice== "N": break f1.close()
import pickle f1 = open("Student.dat", "rb") rno = int(input(“Enter the roll no to search: ”)) flag = 0 try: while True: r = pickle.load(f1) if rno == r[0]: print (rollno, name, marks) flag = 1 except: if flag == 0: print(“Record not found…”) f1.close()
i. A binary file “emp.DAT” has structure (EID, Ename, designation,salary). Write a function to add more records of employes in existing file emp.dat. ii. Write a function Show() in Python that would read detail of employee from file “emp.dat” and display the details of those employee whose designation is “Salesman”. (i) import pickle def createemp: f1=open("emp.dat",'ab') eid=input("Enter E. Id") ename=input("Enter Name") designation=input("Enter Designation") salary=int(input("Enter Salary")) l=[eid,ename,designation,salary] pickle.dump(l,f1) f1.close() (ii) def display(): f2=open("emp.dat","rb") try: while True: rec=pickle.load(f2) if (rec[2]=='Manager'): print(rec[0],rec[1], rec[2],rec[3]) except: break f2.close()
A binary file named “EMP.dat” has some records of the structure [EmpNo, EName, Post, Salary] (a) Create a binary file “EMP.dat” that stores the records of employees and display them one by one. (b) Display the records of all those employees who are getting salaries between 25000 to
(a) import pickle f1 = open('emp.dat','rb') try: while True: e = pickle.load(f1) print(e) except: f1.close()
(b) import pickle f1 = open('emp.dat','rb') try: while True: e = pickle.load(f1) if(e[3]>=25000 and e[3]<=30000): print(e) except: f1.close()
A binary file “Book.dat” has structure [BookNo, Book_Name, Author, Price].
else: pickle.dump(e,f2) except: f1.close() f2.close() os.remove(“student.dat”) os.rename(“temp.dat”,”student,dat”)
num = num + 1 except: f.close() return num
A binary file named “EMP.dat” has some records of the structure [EmpNo, EName, Post, Salary] (a) Write a user-defined function named NewEmp() to input the details of a new employee from the user and store it in EMP.dat. (b) Write a user-defined function named SumSalary(Post) that will accept an argument the post of employees & read the contents of EMP.dat and calculate the SUM of salary of all employees of that Post. (a) import pickle def NewEmp ( ): f = open(“EMP.dat”,”wb”) EmpNo = int(input(“Enter employee number: “)) EName = input(“Enter name:”) Post = input(“Enter post:”) Salary = int(input(“Enter salary”)) rec = [EmpNo, Ename, Post,Salary] pickle.dump(rec, f) f.close() (b) def SumSalary(Post): f = open("EMP.dat", "rb") c= while True: try: g = p.load(f) if g[2]==Post: c=c+g[3] except: f.close() print("sum of salary", c)
A binary file “Items.dat” has structure as [ Code, Description, Price ]. i. Write a user defined function MakeFile( ) to input multiple items from the user and add to Items.dat ii. Write a function SearchRec(Code) in Python which will accept the code as parameter and search and display the details of the corresponding code on screen from Items.dat. (i) import pickle def MakeFile( ): while True: code = input(“Enter Item Code :”) desc = input(“Enter description :”) price = float(input(“Enter price:”)) d= [code,desc,price] f = open (“Items.dat”, “ab”) pickle.dump( d,f ) ch = input(“Add more record? (y/n) :”) if ch==’n’: break f.close( ) (ii) def SearchRec(code): f = open("Items.dat", "rb") found = False while True: try: g = p.load(f) if g[0]==code: print(g[0],g[1],g[2]) found=True break except: if found == False: print("No such record") f.close()
A binary file named “TEST.dat” has some records of the structure [TestId, Subject, MaxMarks, ScoredMarks] Write a function in Python named DisplayAvgMarks(Sub) that will accept a subject as an argument and read the contents of TEST.dat. The function will calculate & display the Average of the ScoredMarks of the passed Subject on screen. def SumSalary(Sub): f = open("ABC.dat", "rb") c= s= while True: try: g = p.load(f) print(g) if g[1]==Sub: s=s+g[3] c=c+ except: f.close() print("sum of salary", s/c) f.close()
Consider a binary file emp.dat having records in the form of dictionary. E.g {eno:1, name:”Rahul”, sal: 5000} write a python function to display the records of above file for those employees who get salary between 25000 and 30000
import pickle def search(): f=open(“emp.dat”,”rb”) while True: try: d=pickle.load(f) if(d[‘sal’]>=25000 and d[‘sal’]<=30000): print(d) except EOFError: break f.close()
A binary file “Bank.dat” has structure as [account_no, cust_name, balance]. i. Write a user-defined function addfile( ) and add a record to Bank.dat. ii. Create a user-defined function CountRec( ) to count and return the number of customers whose balance amount is more than 100000. (i) import pickle def addfile( ): f = open(“bank.dat”,”wb”) acc_no = int(input(“Enter account number: “)) cust_name = input(“Enter name:”) bal = int(input(“Enter balance”)) rec = [acc_no, cust_name, bal] p.dump(rec, f) f.close() (ii) def CountRec( ): f = open(“bank.dat”,”rb”) c = 0 try: while True: rec = p.load(f)
Consider an employee data, Empcode, empname and salary. (i) Write python function to create binary file emp.dat and store their records. (ii) write function to read and display all the records Ans import pickle def add_record(): f = open(“emp.dat”,”ab”) empcode =int(input(“employee code:”)) empname = int(input(“empName:”)) salary = int(input(“salary:”)) d = [empcode, empname, salary] pickle.dump(d,f) f.close() import pickle
def search(): f=open(“emp.dat”,”rb”) while True: try: d=pickle.load(f) print(d)
import pickle def add_record(): fobj = open(“Stu.dat”,”ab”) rollno =int(input(“Roll no:”)) name = int(input(“Name:”)) marks = int(input(“Marks:”)) data = [rollno, name, marks] pickle.dump(data,fobj) fobj.close()
Write a function in python Search_record() to search a record from binary file “Stu.dat” on the basis of roll number. def Search_record(): f = open(“Stu.dat”, “rb”) stu_rec = pickle.load(f) found = 0 rno = int(input(“roll number to search:”)) try: for R in stu_rec: if R[0] == rno: print (R[1], “Found!”) found = 1 break except: if found == 0: print (“Sorry, record not found:”) f.close()
