Class 12 : File Handling Set 4

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16.
Read the code given below and answer the question:
fh=open(“temp.txt”,”w”)
fh.write(“Bye”)
fh.close()
If the file contains “GOOD” before execution, what will be the contents of the file after execution of this code?

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17.
What will be the output of the following code?

import pickle
	names=['first','second','third','fourth','fifth']
	lst=[]
	for i in range(-1,-5,-1):
	lst.append(names[i])
	with open('text.dat','wb') as f:
		pickle.dump(lst,f)
	with open('text.dat','rb') as f:
		nlist= pickle.load(f)
	print(nlist)

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18.
Your recipe uses some ingredients. write a program to store the list of ingredients in a binary file.

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import pickle
with open('ingredients.dat','wb') as f:
    lst=[]
    n=int(input('enter the number of ingredients: '))
    for i in range(n):
        ing=input('enter the name of ingredient: ')
        lst.append(ing)
    print(lst)
    pickle.dump(lst,f)
    
with open('ingredients.dat','rb') as f:
    lst=pickle.load(f)
    print(lst)

19.
Write a program to increase the salary by Rs. 2000/- of the employee having empno 1251 in the file empl.dat.

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import pickle
import os
emp={}
found=False
f=open("emp1.dat","rb")
t=open("temp","wb")
try:
    emp=pickle.load(f)
    while True:
        if emp['empno']==1251:
            emp['salary']=emp['salary']+2000
            found=True
        pickle.dump(emp,t)
        emp=pickle.load(f)
  
except EOFError:
    if found=False:
        print('no match found')
    else:
        print('record updated successfully')
    f.close()
    t.close()
    os.remove('emp1.dat')
    os.rename('temp','emp1.dat')

20.
Consider the following definition of dictionary Multiplex, write a function in python to search and display all the contents in a pickled file cinema.dat, where Mtype key of the dictionary is matching with the value ‘Comedy’.
Mutliplex={‘Mno’:……,’Mname’:………, ‘Mtype’:…….}

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def search_name():
    import pickle
    z=0
    temp={}
    f=open("cinema.dat","rb")
    try:
        while True:
            temp=pickle.load(f)
            if temp['Mtype'] in 'Comedy':
                print(temp)
                z=1
    except EOFError:
        if(z==0):
            print("not found")
        else:
            print("search successful")
        f.close()
        
#calling function
search_details()

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Class 12 Chapter Wise Questions

Python Functions

Class 12 File Handling Questions

Python Networking

SQL

Class 12 : File Handling Set 4