How to take Integer user input in Python

# Table of Contents

1. Take integer user input in Python
2. Only allow Integer user input in Python

# Take integer user input in Python

To take an integer user input:

1. Use the input() function to take input from the user.
2. Use a try/except statement to make sure the input value is an integer.
3. Use the int() class to convert the string to an integer.

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# ✅ Take user input integer value
user_input = int(input('Enter an integer: '))
print(user_input)

# ------------------------------------------------

# ✅ Take user input integer value with validation
try:
    user_input = int(input('Enter an integer: '))
    print(user_input)
except ValueError:
    print('Enter a valid integer')

We used the input() function to take user input.

The input() function takes an optional prompt argument and writes it to standard output without a trailing newline.

The function then reads the line from the input, converts it to a string and returns the result.

This is why we used the int() class to convert the value to an integer.

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user_input = int(input('Enter an integer: '))
print(user_input)

If the user enters an invalid integer, we'd get a ValueError.

You can handle the error using a try/except statement.

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try:
    user_input = int(input('Enter an integer: '))
    print(user_input)
except ValueError:
    print('Enter a valid integer')

# Only allow Integer user input in Python

To only allow integer user input:

1. Use a while True loop to loop until the user enters an integer.
2. Use the int() class to attempt to convert the value the user entered to an integer.
3. If the user entered an integer, use the break statement to break out of the loop.

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while True:
    try:
        num = int(input('Your favorite integer: '))
        print(num)
        break
    except ValueError:
        print('Please enter an integer.')

We used a while True loop to iterate until the user enters an integer value.

The input() function takes an optional prompt argument and writes it to standard output without a trailing newline.

The function then reads the line from the input, converts it to a string and returns the result.

We used the int() class to try to convert the value the user entered to an integer.

Copied!
while True:
    try:
        num = int(input('Your favorite integer: '))
        print(num)
        break
    except ValueError:
        print('Please enter an integer.')

If the attempt to convert the value fails, a ValueError is raised and the except block runs.

The except block prints the "Please enter an integer" message and the loop re-runs.

The break statement breaks out of the innermost enclosing for or while loop.

# Only allow integer user input in a given range

If you need to make sure the user enters an integer in a given range, use an if statement.

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while True:
    try:
        num = int(input('Integer between 1 and 100: '))
        print(num)

        if num < 1 or num > 100:
            raise ValueError

        break
    except ValueError:
        print('Please enter an integer between 1 and 100.')

The code snippet only allows a user to enter an integer between 1 and 100.

If the value is not an integer, is less than 1 or is greater than 100, a ValueError is raised and the loop re-runs.

Once the user enters an integer in the specified range, no ValueError is raised and we break out of the while loop.

# Additional Resources

You can learn more about the related topics by checking out the following tutorials:

• Taking user input boolean (True/False) values in Python
• How to Create a Date from user Input in Python
• Taking a file path from user input in Python
• How to take Float user input in Python
• Multiple lines user Input in Python
• Only accept a single character from user Input in Python
• Creating a Tuple or a Set from user Input in Python
• How to Validate user input in Python
• Yes/No question with user input in Python
• How to save user input to a File in Python
• Using user input to Select an Option from a List in Python
• EOFError: EOF when reading a line in Python [Solved]