20+ Basic Python Read File & Write File programs (Solved)

Basic Python Read File | Write File programs

Data File Handling is an important topic for class 12 Computer Science Board Exams. Here you will find Solved Python read file and write file programs of Text File and Binary File

Basic Python Read File | Write File programs

Basic programs of Data File Handling (python read file and write to file) in python

Q1. Write a program to read entire content of file “story.txt”

Show Answer
Ans. 

f=open("story.txt" , "r")

d = f.read( )

print(d) 

Q2. Write a program to read first line of file “data.txt”.

Show Answer
Ans. 

f=open("data.txt" , "r")

d = f.readline( )

print(d) 

Q3. Write a program to count total number of lines in “sports.txt”.

Show Answer
Ans. 

f=open("sports.txt" , "r")

d = f.readlines( )

print(len(d))

Q4. Write a program to display first alphabet of all the lines in “library.txt”.

Show Answer
Ans.

f=open("library.txt" , "r")

d = f.readlines( )

for i in d:

    print(i[0]) 

Q5. Write a program to read first 15 characters from the file “class.txt”.

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Ans.

f=open("class.txt" , "r")

d = f.read(15)

print(d) 

Q6. Write a program to display only third line of file “test.txt”.

Show Answer
Ans.

f=open("test.txt" , "r")

d = f.readlines( )

print(d[2]) 

Q7. Write a program to display the length of file “len.txt”(Should not include EOL)

Show Answer
Ans. 

f=open("len.txt","r")

d = f.read()

L=0

for i in d:

  if i!="\n":

    L=L+1

print(L)

OR

f=open("len.txt","r")

d = f.read()

print(len(d)) #It will count the EOL also 

Q8. Write python code to write the following lines in a file “story.txt”

Python read File and write File.

Weightage of python read file and write file is 10 marks.

Practice one program daily of python read file

Show Answer
Ans. 

f=open("story.txt",'w')

f.write("Python read File and write File.\n")

f.write("Weightage of python read file and write file is 10 marks.\n")

f.write("Practice one program daily of python read file\n")

f.close( ) 

Q9. Write a program to accept five numbers from the user and write in a file “number.txt” in separate lines.

Show Answer
Ans.

f=open("number.txt",'w')

for i in range(5):

  n=int(input("Enter number"))

  f.write(str(n)) #write( ) function takes string argument

  f.write("\n")

f.close( ) 

Q10. Write a program to read content from a file “number.txt” and display the sum of numbers present in file.

for example : if the file contains the following data

Total marks in exam is 25
My roll number is 15
My Address is 207(FF)

Output :
22

Show Answer
Ans. 

f=open("number.txt" , "r")

d = f.read()

s=0

for i in d:

  if i.isdigit( )==True:

    s=s+int(i)

print("Sum of numbers is  :", s) 

Q11. Write a program to create a list of 10 numbers and store it in a file “num.dat”

Show Answer
Ans. 

import pickle

L = [ ]

for i in range(10):

     num = int(input("Enter number"))

     L.append(num)

f=open("num.dat" , 'wb')

pickle.dump(L,f)

f.close()

#To verify your input, below is the code for reading file

f=open("num.dat" , 'rb') 

d = pickle.load(f)

print(d) 

Q12. Write a program to write the following dictionary in a binary file named “detail.dat”.

D = {1 : ‘A’, 2 : ‘B’, 3 : ‘C’}

Show Answer
Ans. 

import pickle

D = {1 : 'A', 2 : 'B', 3 : 'C'}

f=open("detail.dat" , 'wb')

pickle.dump(D,f)

f.close()

#To verify your input, below is the code for reading file

f=open("detail.dat" , 'rb')

d = pickle.load(f)

print(d)

Q13. Write a program to store roll number and marks of five students in a dictionary and write the dictionary in a binary file “student.dat”

Show Answer
Ans.

import pickle

d={ }

for i in range(5):

  rno = int(input("Enter Roll number"))

  marks = int(input("Enter marks"))

  d[rno] = marks

f=open("student.dat" , 'wb')

pickle.dump(d,f)

f.close( )

#To verify your input, below is the code for reading file

f=open("student.dat" , 'rb')

d = pickle.load(f)

print(d)

Q14. Write a program to add record of product (product number, product name) in a binary file “product.dat” (using list).

Show Answer
Ans. 

import pickle

L =[ ]

temp=[ ]

pno = int(input("Enter product number"))

pname = input("Enter product name")

temp=[pno,pname]

L.append(temp) #Use Loop to insert more records

f=open("product.dat" , 'wb')

pickle.dump(L,f)

f.close( )

# Below is the code to verify the result

f=open("product.dat" , 'rb')

d = pickle.load(f)

print(d)

Q15. Write a program to read all the records of product from “product.dat” (created above).

Show Answer
Ans. 

f=open("product.dat" , 'rb')

d = pickle.load(f)

print(d)

Q16. Write a program to search the record from the file “product.dat” created above according to the product number entered by the user.

Show Answer
Ans. 

f=open("product.dat" , 'rb')

d = pickle.load(f)

prno = int(input("Enter product number to search"))

j = 0

k = 0

for i in d:

    if d[j][0]==prno:

       print(i)

       j = j + 1

       k=1

       break

  else:

      j = j+1

if k==0:

  print("Record not found")

Q17. Write a program to read the entire content from “record.csv”.

Show Answer
Ans.

import csv

f = open("record.csv" , "r")

data = csv.reader(f)

for row in data:

      print(row)

f.close( )

Q18. Write a program to read the entire content from “data.csv” using “with open ( ) ” method.

Show Answer
Ans. 

import csv

with open("data.csv" , "r") as f:

     data = csv.reader(f)

     for row in data:

          print(row)

 f.close( )

Q19. Write a program to count the number of records in “record.csv”.

Show Answer
Ans.

import csv

 r = 0

 with open("data.csv" , "r") as f:

     data = csv.reader(f)

     for row in data:

         r=r+1

     print("Total records are :", r-1) #subtract 1 for excluding header

 f.close( )

Q20. Write a program to read the following data from “product.csv” and display the sum of all the price.

p_name , p_price  
Keyborad , 200  
Mouse , 150  
Harddisk , 2500  
RAM , 2000   

Show Answer
Ans. 

import csv

 r = 0

 with open("data.csv" , "r") as f:

     next(f)# to skip header

     data = csv.reader(f)

     for i in data:

         r = int(i[1]) + r

     print("Sum of price is :", r)

 f.close( )

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