Python file program read numbers write squares

Task: Write a Python file program read numbers write squares. This Python programming tutorial will explain the Python program with the following statement:

Write a Python program to open an existing text file called “fnumbers.txt” on D drive. It will read each number and calculate its square. Then the program will write the square in another new text file with the name “fsquares.txt”  on D drive.

The Solution:

For the Beginners: How to Write and Run Your First Python Program in IDLE- Integrated development and Learning Envoironment for Python

First of all, open notepad software to create a new text file with numbers.

Python file program read and write files

Python read file and write file

Write down one to seven numbers in this text file.

1
2
3
4
5
6
7

Select Save option from File menu. Write fnumbers as the name of file in file name text box. Select the file location as D drive. Click on Save button or press Enter simply.

Python file program to read numbers from a file and write squares in another

Python file program read and write files in Python

Write the following program in Python IDLE IDE. Save the Python program with a suitable name. Click on “Run module” command in Run menue of the Python IDLE IDE.

If the program executed successfully, you will see another file on D drive

Output of read and write file program in Python

The Source code of Python file program read numbers write squares

# Write a Python program to open
# an existing file fnumbers.txt from
# D drive. The program will read numbers
# from this file and write the squares of
# every number in a new file fsquares.txt
# on D drive.

# open fnumbers.txt file in read mode
file1 = open("d:/fnumbers.txt", "r")

# create a new file fsquares.txt with "w" mode
file2 = open("d:/fsquares.txt", "w")

# use a for loop to read a number
# and calculate and write its square in
# fsquares.txt file

for n in file1:
    num = int(n)
    print(num*num, file=file2)
    
file1.close()
file2.close()

How this program works?

• Write a Python program to open an existing file fnumbers.txt from D drive.
• The program will read numbers from this file
• and write the squares of every number in a new file fsquares.txt on D drive.
• open fnumbers.txt file in read mode
• create a new file fsquares.txt with “w” mode
• use a for loop to read a number
• and calculate and write its square in fsquares.txt file
• close the files

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