⌨️ Python User Input

⚡ Quick Overview

In Python, you can ask the user to type something while the program is running using the built-in input() function…

User input is essential for making your programs interactive—for example, forms, quizzes, calculators, and games.

? Key Concepts

• input() returns a string – even if the user types numbers.
• Type conversion – use int() or float() to convert the string to numbers.
• Prompt message – the text inside input("...") explains what the user should type.
• Multiple values – combine input() with split() to read more than one value at a time.
• Formatting output – use + with strings or f-strings like f"Hello {name}".

? Syntax and Theory

Basic syntax of the input() function:

# store what the user types in a variable
variable_name = input("Prompt message shown to the user: ")

To use a value as an integer or float, wrap input() with a type conversion function:

# read age as an integer
age = int(input("Enter your age: "))
# read height as a float
height = float(input("Enter your height in meters: "))

? Code Examples

? Basic Text Input

Ask the user for their name and greet them:

# ask for the user's name
name = input("Enter your name: ")
# greet the user
print("Hello, " + name)

? Numeric Input with int()

Read an age as a number so you can perform numeric operations:

# read the age as text
age = input("Enter your age: ")
age = int(age)  # convert string to integer
# print the result
print(f"You are {age} years old.")

➕ Reading Multiple Values with split()

Read two numbers separated by a space and print their sum:

# read two numbers at once
a, b = input("Enter two numbers separated by space: ").split()
# convert them to integers
a = int(a)
b = int(b)
# print their sum
print("Sum =", a + b)

? Reading Floating-Point Numbers

Read a decimal value such as height and format the output:

# input float value
height = float(input("Enter your height in meters: "))
# show with 2 decimals
print(f"Your height is {height:.2f} meters")

? Live Output and Explanation