Ans.
f = open("story.txt", "r")
d = f.read()
ch = input("Enter character to be replaced")
ch1 = input("Enter character that will replaced")
d = d.replace(ch, ch1)
f.close()
f = open("story.txt", "w")
f.write(d)
f.close()
PythonFile Handling Programs
Q3. Write a program in python to replace all the ‘a’ by ‘@’ in a file “data.txt”.
Ans.
f = open("story.txt", "r")
d = f.readlines()
m = [ ]
for i in d:
if i not in m:
m.append(i)
print(m)
f.close()
f = open("story.txt", "w")
for i in m:
f.write(i)
f.close()
Q6. Write a program in python to display only unique words from the file “story.txt”.
Ans.
f = open("task.txt", "r")
d = f.read()
va=ve=vo=vu=vi=0
for i in d:
if i=='a' or i=='A':
va=va+1
if i=='e' or i=='E':
ve=ve+1
if i=='i' or i=='I':
vi=vi+1
if i=='o' or i=='O':
vo=vo+1
if i=='u' or i=='U':
vu=vu+1
print("Frequency of vowel \"a\" is", va)
print("Frequency of vowel \"e\" is", ve)
print("Frequency of vowel \"i\" is", vi)
print("Frequency of vowel \"o\" is", vo)
print("Frequency of vowel \"u\" is", vu)
Q8. Write a program in python to count those words whose length is more than 7 characters in a file “story.txt”.
Ans.
f = open("data.txt", "r")
f1 = open("story.txt", "w")
d = f.read()
d = d.lower()
word = d.split()
for i in word:
if i[0] in ['a', 'e', 'i', 'o', 'u']:
f1.write(i)
f.close()
f1.close()
Q17. Write a program in Python to read the entire content from file “data.txt” and copy only those words in separate lines to “story.txt” which are starting from lower case alphabets .
Ans.
f = open("data.txt", "r")
f1 = open("story.txt", "w")
d = f.read()
word = d.split()
for i in word:
if i[0].islower():
f1.write(i)
f1.write("\n")
f.close()
f1.close()
Q18. Write a program in Python to read file “data.txt” and copy only those lines to “story.txt” which are starting from alphabets “A” or “T”.
Ans.
f = open("data.txt", "r")
f1 = open("story.txt", "w")
d = f.readlines()
for i in d:
if i[0] == "A" or i[0] == "T":
f1.write(i)
f.close()
f1.close()
Python File Handling Programs
PythonFile Handling Programs
Q19. Write a program in Python which display the longest word from file “star.txt”
Ans.
f = open("star.txt", "r")
d = f.read()
L = d.split()
longword = " "
for i in L:
if len(i) > len(longword):
longword = i
print("longest word is ,",longword)
f.close()
Q20. Write a program in Python which display the longest line from file “star.txt”
Ans.
f = open("star.txt", "r")
d = f.readlines()
longline = " "
for i in d:
if len(i) > len(longline):
longline = i
print("longest line is : ", longline)
f.close()
PythonFile Handling Programs
Q21. Write a program in Python to read the file “star.txt” and display the entire content after removing leading and trailing spaces.
Ans.
f = open("data.txt", "r")
d = f.readlines()
print("Second line is :",d[1])
print("Second last line is :",d[-2])
f.close()
Python File Handling Programs
PythonFile Handling Programs-Binary File
Q24. Consider a binary file “data.dat” which stores the record of “Hotel” in the form of list containing Room_no, Price, Room_type. Do the following task in a file
Write a function addrec() to add a record in a file.
Write a function disp() to display all the records from the file.
Write a function specific_disp(room_no) which takes room number as argument and display its details.
Write a function mod(room_no) which takes room number as argument and modify it’s details.
Write a function del(room_no) which takes room number as argument and delete it’s record from file “data.dat”
Ans 1.
import pickle
def addrec():
L=[ ]
f=open("data.dat","ab")
rn = int(input("Enter Room Number"))
pr = int(input("Enter the price of room"))
rt = input("Enter the type of room")
L = [rn, pr, rt]
pickle.dump(L, f)
print("Record added in the file")
f.close()
addrec()
___________________________________________________________________________________________________________
Ans 2.
import pickle
def disp():
try:
f=open("data.dat","rb")
while True:
d=pickle.load(f)
print(d)
except:
f.close()
disp()
___________________________________________________________________________________________________________
Ans 3.
import pickle
def specific_rec(rno):
try:
f1=open("data.dat","rb")
while True:
d=pickle.load(f1)
if rno==d[0]:
print(d)
except:
f1.close()
rno=int(input("Enter Room number to search"))
specific_rec(rno)
___________________________________________________________________________________________________________
Ans 4.
import pickle
import os
def mod():
roll = int(input("Enter room number whose record you want to Modify:"))
try:
file = open("data.dat","rb+")
f=open("temp1.dat","wb")
while True:
d = pickle.load(file)
if roll == d[0]:
d[1]=int(input("Enter modified price"))
d[2]=input("Enter modified room type")
pickle.dump(d,f)
except:
print("Record Updated")
file.close()
f.close()
os.remove("data.dat")
os.rename("temp1.dat","data.dat")
mod()
___________________________________________________________________________________________________________
Ans 5.
import pickle
import os
def delete():
roll = int(input("Enter room number whose record you want to delete:"))
try:
file = open("data.dat","rb+")
f=open("temp1.dat","wb")
while True:
d = pickle.load(file)
if roll != d[0]:
pickle.dump(d,f)
else:
found = 1
except:
print("Record Deleted")
file.close()
f.close()
os.remove("data.dat")
os.rename("temp1.dat","data.dat")
delete()
Q25. Write a menu driven program which shows all operations on Binary File
Add Record
Display All Record
Display Specific Record
Modify Record
Delete Record
Use “data.dat” file which stores the record of “Hotel” in the form of list containing Room_no, Price, Room_type.
Ans.
import pickle
import os
def main_menu():
print("1. Add a new record")
print("2. Display all record")
print("3. Display Specific record")
print("4. Modify a record")
print("5. Delete a record")
print("6. Exit")
ch = int(input("Enter your choice:"))
if ch==1:
addrec()
elif ch==2:
disp()
elif ch==3:
specific_rec()
elif ch==4:
mod()
elif ch==5:
del()
elif ch==6:
print("Bye")
else:
print("Invalid Choice.")
def addrec():
L=[ ]
f=open("data.dat","ab")
rn = int(input("Enter Room Number"))
pr = int(input("Enter the price of room"))
rt = input("Enter the type of room")
L = [rn, pr, rt]
pickle.dump(L, f)
print("Record added in the file")
f.close()
def disp():
try:
f=open("data.dat","rb")
while True:
d=pickle.load(f)
print(d)
except:
f.close()
def specific_rec():
rno=int(input("Enter Room number to search"))
try:
f1=open("data.dat","rb")
while True:
d=pickle.load(f1)
if rno==d[0]:
print(d)
except:
f1.close()
def mod():
roll = int(input("Enter room number whose record you want to Modify:"))
try:
file = open("data.dat","rb+")
f=open("temp1.dat","wb")
while True:
d = pickle.load(file)
if roll == d[0]:
d[1]=int(input("Enter modified price"))
d[2]=input("Enter modified room type")
pickle.dump(d,f)
except:
print("Record Updated")
file.close()
f.close()
os.remove("data.dat")
os.rename("temp1.dat","data.dat")
def delete():
roll = int(input("Enter room number whose record you want to delete:"))
try:
file = open("data.dat","rb+")
f=open("temp1.dat","wb")
while True:
d = pickle.load(file)
if roll != d[0]:
pickle.dump(d,f)
except:
print("Record Deleted")
file.close()
f.close()
os.remove("data.dat")
os.rename("temp1.dat","data.dat")
PythonFile Handling Programs
Q26. Write a function disp75() in Python to display only those records of students from file “school.dat” who scored more than 75 percent marks. Structure stored in “school.dat” is in the form of list containing information like [rollno, name, class, percentage]
Ans.
def disp75():
f=open("school.dat", "rb")
try:
while True:
d=pickle.load(f)
if d[3]>75:
print("Roll Number : ", d[0], "\n")
print("Name : ", d[1], "\n")
print("Class : ", d[2], "\n")
print("Percentage : ", d[3], "\n")
except:
f.close()
disp75()
Q27. Write a function dispname() in Python which will display only names of all the students from file “school.dat”. Structure stored in “school.dat” is in the form of list containing information like [rollno, name, class, percentage]
Ans.
def dispname():
f=open("school.dat","rb")
try:
while True:
d=pickle.load(f)
print("Name : ", d[1],"\n")
except:
f.close()
dispname()
Q28. Write a function disp12() in Python which will display records of class 12th students from file “school.dat”. Structure stored in “school.dat” is in the form of list containing information like [rollno, name, class, percentage]
Ans.
def disp12( ):
f=open("school.dat", "rb")
try:
while True:
d=pickle.load(f)
if int(d[2]) == 12:
print("Roll Number : ", d[0],"\n")
print("Name : ", d[1],"\n")
print("Class : ", d[2],"\n")
print("Percentage : ", d[3],"\n")
except:
f.close( )
disp12( )
PythonFile Handling Programs
Q29. Write a function search(name) in Python which will display record of a student from file “school.dat” whose name is passed as an argument. Structure stored in “school.dat” is in the form of list containing information like [rollno, name, class, percentage]
Ans.
def search(nm):
f=open("school.dat","rb")
try:
while True:
d=pickle.load(f)
if d[1].lower() == nm.lower():
print("Roll Number : ", d[0],"\n")
print("Name : ", d[1],"\n")
print("Class : ", d[2],"\n")
print("Percentage : ", d[3],"\n")
except:
f.close()
nm=input("Enter name of the student")
search(nm)
Q30. Write a function rem() in Python which will delete the records of students from file “school.dat” who scored less than 30 percent marks. Structure of “school.dat” is in the form of list containing information like [rollno, name, class, percentage].
Ans.
import pickle
import os
def rem():
f=open("school.dat", "rb")
f1=open("temp.dat", "wb")
try:
while True:
d=pickle.load(f)
if(d[3])>30:
pickle.dump(d, f1)
except:
f.close()
f1.close()
os.remove("school.dat")
os.rename("temp.dat", "school.dat")
rem()
Q31. Write a function modi_rec(rno) in Python which will modify the records of students from file “school.dat” whose Roll number is passed as an argument. Structure of “school.dat” is in the form of list containing information like [rollno, name, class, percentage].
Ans.
def modi_rec(rn):
f=open("school.dat","rb")
f1=open("temp.dat","wb")
try:
while True:
d=pickle.load(f)
if(d[0])!=rn:
pickle.dump(d, f1)
else:
nm=input("Enter name of student: ")
cls=input("Enter Class of student: ")
per=int(input("Enter percentage of student: "))
L=[rn, nm, cls, per]
pickle.dump(L,f1)
except:
f.close()
f1.close()
os.remove("school.dat")
os.rename("temp.dat", "school.dat")
rn = int(input("Enter roll number of student whose record you want to modify"))
modi_rec(rn)
PythonFile Handling Programs
Q32. Write a function disp_author(name) in Python to display detail of author whose name is passed as an argument from “book.dat”. Structure stored in file is in the form of [Bookid, Price, Author Name, Subject]
Ans.
import pickle
def disp_author(name):
try:
f1=open("book.dat","rb")
while True:
d=pickle.load(f1)
if name==d[2]:
print(d)
except:
f1.close()
author_name = input("Enter Author Name")
disp_author(author_name)
Q33. Write a function addmarks(name) in Python which will add the marks of all the subjects of a student whose name is passed as an argument from “marks.dat”. Structure of “marks.dat” is [Name, Chem_marks, Phy_marks, CS_marks, Eng_marks]
Ans.
import pickle
def addmarks(name):
try:
f1=open("marks.dat","rb")
while True:
d=pickle.load(f1)
if name==d[0]:
s=d[1]+d[2]+d[3] + d[4]
print("Total marks of ",name, "is", s)
except:
f1.close()
s_name = input("Enter Student Name")
addmarks(s_name)
Q34. Write a function addval() in Python which will add the record of a mobile in “mobile.dat”. Structure of “mobile.dat” is [Mobile id, Mobile brand, Model No., Price]
Ans.
import pickle
def addval():
L=[ ]
f=open("mobile.dat","ab")
mid = int(input("Enter Mobile id"))
mb = input("Enter the brand of mobile")
mn = input("Enter the model number of mobile")pr = int(input("Enter the price of Mobile"))
L = [mid, mb, mn, pr]
pickle.dump(L, f)
print("Record added in the file")
f.close()
addval()
Q35. Write a function disp_mob(model no.) in Python which will display the record of a mobile from “mobile.dat” whose model number (integer type) is passed as an argument. Structure of “mobile.dat” is [Mobile id, Mobile brand, Model No., Price]
Ans.
import pickle
def disp_mob(modno):
try:
f1=open("mobile.dat","rb")
while True:
d=pickle.load(f1)
if modno==d[2]:
print(d)
except:
f1.close()
mod_number = int(input("Enter the model number of mobile"))
disp_mob(mod_number)
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