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    To read a number from the user in Python, you can use the input() function and convert the input to an integer or float, depending on your needs. By default, input() returns a string, so type conversion is necessary.

    Example: Reading an Integer

    # Prompt the user to enter a number
    number = int(input("Enter a number: "))
    print(f"You entered: {number}")
    Copied!

    Example: Reading a Float

    # Prompt the user to enter a decimal number
    decimal_number = float(input("Enter a decimal number: "))
    print(f"You entered: {decimal_number}")
    Copied!

    Validating Input

    To ensure the user enters a valid number, you can use exception handling:

    while True:
    try:
    number = int(input("Enter an integer: "))
    print(f"You entered: {number}")
    break
    except ValueError:
    print("Invalid input. Please enter a valid integer.")
    Copied!

    Important Notes

    • Always validate user input to avoid runtime errors.

    • Use int() for integers and float() for decimal numbers.

    • For multiple inputs in one line, you can use map():

    numbers = list(map(int, input("Enter numbers separated by spaces: ").split()))
    print(f"You entered: {numbers}")
    Copied!
    Learn more:
    1 -w3schools.com2 -stackoverflow.com3 -geeksforgeeks.org
    How to extract all numbers from a sentence in Python?
    Example: The input sentence has 2 integer values: "2" and "4". Below are several methods to perform this task in Python: re.findall () function searches the text and finds all number patterns using regex, making it an easy way to extract all numbers at once. It can extract positive, negative, and decimal numbers.
    geeksforgeeks.org
    GeeksForGeeks
    https://www.geeksforgeeks.org/python/python-extract-numbers-from …
    Python | Extract Numbers from String - GeeksforGeeks
  1. Stack Overflow
    https://stackoverflow.com › questions

    python - How can I read inputs as numbers? - Stack …

    Dec 8, 2013 · Python 2's input function evaluated the received data, converting it …

    • Reviews: 1

      Code sample

      >>> sys.version
      '3.4.0 (default, Apr 11 2014, 13:05:11) \n[GCC 4.8.2]'
      >>> data = input("Enter a number: ")
      Enter a number: 5 + 17
      >>> data, type(data)...
      python - How to extract and read numbers from a text file in python3 ...
      How to read numbers from file in Python?
      See more results
    • GeeksForGeeks
      https://www.geeksforgeeks.org › python › python-extract-n…

      Python | Extract Numbers from String - GeeksforGeeks

      Nov 10, 2025 · re.findall () function searches the text and finds all number patterns using regex, making it an easy way to extract all numbers at once. It can extract …

    • Real Python
      https://realpython.com › python-input-integer

      How to Read Python Input as Integers

      In this tutorial, you’ll learn how to create a reusable utility function that’ll guarantee valid integer inputs from an interactive user. Along the way, you’ll learn about …

    • Python Guides
      https://pythonguides.com › extract-numbers-from-a-string-i…

      How To Extract Numbers From A String In Python?

      Jan 28, 2025 · Learn how to extract numbers from a string in Python using methods like isdigit (), split (), and regular expressions. Includes examples for data parsing.

    • Tutorial Kart
      https://www.tutorialkart.com › python › how-to-extract-nu…

      How to Extract Numbers from a Text File in Python?

      To extract numbers from a text file in Python, you can use regular expressions (re module), list comprehensions, or isdigit() checks while reading the file line by line.

    • SciPython
      https://scipython.com › ... › examples › reading-numbers-from-a-file

      Reading numbers from a file - scipython.com

      In practice, it is better to use NumPy (see Chapter 6 of the book) to read in data files such as these.

    • Sling Academy
      https://www.slingacademy.com › article › python-how-to-extract-numbers...

      Python: How to Extract Numbers from Text (2 Approaches)

      Jun 4, 2023 · This practical, example-based article will show you a few ways to extract numbers (integers and floats, positive and negative) from text in Python. There’s no time to waste; let’s get our …

    • Python Examples
      https://pythonexamples.org › python-read-number-from-console

      Read Number from Console in Python

      In this tutorial of Python Examples, we learned how to read an integer from console: read string using input () and then typecast it using int (); and then how to read a floating point value using input () and …

    • GeeksForGeeks
      https://www.geeksforgeeks.org › python › extract-numbers-from-a-text-file...

      Extract numbers from a text file and add them using Python

      Jun 21, 2025 · This method reads the file line by line and checks each character using isdigit (). If the character is a digit, it's converted to an integer and added to a running total.

    • PyTutorial
      https://pytutorial.com › python-while-loop-read-numbers-from-text-file

      Python While Loop Read Numbers from Text File - PyTutorial

      Feb 14, 2026 · Learn how to use a Python while loop to read numbers from a text file efficiently, with practical examples for robust file handling and data processing.

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