Python User Input

User input allows users to enter data while the program is running. Python uses the input() function to take input from users.

Why User Input is Important?

Basic User Input

The input() function is used to take input from the keyboard.

name = input("Enter your name: ")

print(name)

How this Program Works?

Step 1: Python shows the message:

Enter your name:

Step 2: User enters a value.

Rahul

Step 3: The entered value gets stored inside variable name.

Step 4: Python prints the stored value.

Rahul

Input Always Returns String

By default, the input() function returns data as a string.

age = input("Enter your age: ")

print(age)

print(type(age))

Output

25

<class 'str'>

Even though the user entered 25, Python still stores it as a string.

Converting Input to Integer

Use the int() function to convert input into integer.

age = int(input("Enter your age: "))

print(age)

print(type(age))

Output

25

<class 'int'>

Now Python stores the value as integer instead of string.

Taking Decimal Input

Use the float() function for decimal numbers.

price = float(input("Enter price: "))

print(price)

print(type(price))

Output

99.99

<class 'float'>

Taking Multiple Inputs

You can take multiple values from users.

name = input("Enter your name: ")

city = input("Enter your city: ")

print(name)

print(city)

User Input Addition Example

This example creates a simple calculator using user input.

num1 = int(input("Enter first number: "))

num2 = int(input("Enter second number: "))

total = num1 + num2

print(total)

Example Calculation

num1 = 10

num2 = 20

total = 10 + 20

Output

30

String Concatenation with Input

Input values can also be combined with strings.

name = input("Enter your name: ")

print("Welcome " + name)

Output

Welcome Rahul

Common Mistake

If numbers are not converted using int(), Python performs string joining instead of addition.

num1 = input("Enter first number: ")

num2 = input("Enter second number: ")

print(num1 + num2)

Example

num1 = "10"

num2 = "20"

Python joins both strings.

1020

To perform actual addition, use int().

Real Life Example

This example stores student information entered by the user.

student_name = input("Enter student name: ")

student_marks = int(input("Enter marks: "))

print("Student Name:", student_name)

print("Marks:", student_marks)

Summary