In Python, we can use the input() to accept input from a user and print() to display output on the console. Also, we can use Python for file handling (Reading, writing, appending, and deleting files).
This Python Input and Output exercise aims to help Python developers to learn and practice the Python built-in functions print() and input() to perform input and output tasks. Also, we will solve exercises to practice file handling in Python.
This Input and Output exercise includes the following: –
- The exercise contains 10 questions and solutions provided for each question.
- When you complete each question, you get more familiar with the Python Input and Output.
- Let us know if you have any alternative solutions. It will help other developers.
Use Online Code Editor to solve exercise questions.
Table of contents
- Exercise 1: Accept numbers from a user
- Exercise 2: Display three string “Name”, “Is”, “James” as “Name**Is**James”
- Exercise 3: Convert Decimal number to octal using print() output formatting
- Exercise 4: Display float number with 2 decimal places using print()
- Exercise 5: Accept a list of 5 float numbers as an input from the user
- Exercise 6: Write all content of a given file into a new file by skipping line number 5
- Exercise 7: Accept any three string from one input() call
- Exercise 8: Format variables using a string.format() method.
- Exercise 9: Check file is empty or not
- Exercise 10: Read line number 4 from the following file
Exercise 1: Accept numbers from a user
Write a program to accept two numbers from the user and calculate multiplication
Help: Take user input in Python
Show Hint
- Use Python 3’s built-in function
input()to accept user input - Convert user input to the integer type using the
int()constructor.
Show Solution
num1 = int(input("Enter first number "))
num2 = int(input("Enter second number "))
res = num1 * num2
print("Multiplication is", res)
Exercise 2: Display three string “Name”, “Is”, “James” as “Name**Is**James”
Use the print() function to format the given words in the mentioned format. Display the ** separator between each string.
Expected Output:
For example: print('Name', 'Is', 'James') will display Name**Is**James
Show Hint
Use the sep parameter of the print() function to define the separator symbol between each word.
Show Solution
print('My', 'Name', 'Is', 'James', sep='**')Exercise 3: Convert Decimal number to octal using print() output formatting
Given:
num = 8Expected Output:
The octal number of decimal number 8 is 10
Show Hint
Use the %o formatting code in print() function to format decimal number to octal.
Show Solution
num = 8
print('%o' % num)
Exercise 4: Display float number with 2 decimal places using print()
Given:
num = 458.541315Expected Output:
458.54
Show Hint
Use the %.2f formatting code in print() function to format float number to two decimal places.
Show Solution
num = 458.541315
print('%.2f' % num)Exercise 5: Accept a list of 5 float numbers as an input from the user
Refer:
Expected Output:
[78.6, 78.6, 85.3, 1.2, 3.5]
Show Hint
- Create a list variable named
numbers - Run loop five times
- In each iteration of the loop, use the
input()function to take input from a user - Convert user input to float number using the
float()constructor - Add float number to the
numberslist using theappend()function
Show Solution
numbers = []
# 5 is the list size
# run loop 5 times
for i in range(0, 5):
print("Enter number at location", i, ":")
# accept float number from user
item = float(input())
# add it to the list
numbers.append(item)
print("User List:", numbers)Exercise 6: Write all content of a given file into a new file by skipping line number 5
See:
Create a test.txt file and add the below content to it.
Given test.txt file:
line1 line2 line3 line4 line5 line6 line7
Expected Output: new_file.txt
line1 line2 line3 line4 line6 line7
Show Hint
- Read all lines from a test.txt file using the
readlines()method. This method returns all lines from a file as a list - Open new text file in write mode (
w) - Set
counter = 0 - Iterate each line from a list
- if the counter is 4, skip that line, else write that line in a new text file using the
write()method - Increment counter by 1 in each iteration
Show Solution
# read test.txt
with open("test.txt", "r") as fp:
# read all lines from a file
lines = fp.readlines()
# open new file in write mode
with open("new_file.txt", "w") as fp:
count = 0
# iterate each lines from a test.txt
for line in lines:
# skip 5th lines
if count == 4:
count += 1
continue
else:
# write current line
fp.write(line)
# in each iteration reduce the count
count += 1
Exercise 7: Accept any three string from one input() call
Write a program to take three names as input from a user in the single input() function call.
See: Get multiple inputs from a user in one line
Show Hint
- Ask the user to enter three names separated by space
- Split input string on whitespace using the
split()function to get three individual names
Expected Output
Enter three string Emma Jessa Kelly Name1: Emma Name2: Jessa Name3: Kelly
Show Solution
str1, str2, str3 = input("Enter three string").split()
print('Name1:', str1)
print('Name2:', str2)
print('Name3:', str3)Exercise 8: Format variables using a string.format() method.
Write a program to use string.format() method to format the following three variables as per the expected output
Given:
totalMoney = 1000
quantity = 3
price = 450Expected Output:
I have 1000 dollars so I can buy 3 football for 450.00 dollars.
Show Solution
quantity = 3
totalMoney = 1000
price = 450
statement1 = "I have {1} dollars so I can buy {0} football for {2:.2f} dollars."
print(statement1.format(quantity, totalMoney, price))
Exercise 9: Check file is empty or not
Write a program to check if the given file is empty or not
Show Hint
Use os.stat('file_name').st_size() function to get the file size. if it is 0 then the file is empty.
Show Solution
import os
size = os.stat("test.txt").st_size
if size == 0:
print('file is empty')
Exercise 10: Read line number 4 from the following file
See:
Create a test.txt file and add the below content to it.
test.txt file:
line1 line2 line3 line4 line5 line6 line7
Show Solution
# read file
with open("test.txt", "r") as fp:
# read all lines from a file
lines = fp.readlines()
# get line number 3
print(lines[2])
See: Read Specific Lines From a File in Python for different solutions.
