Python User Input

Python allows users to enter data during program execution using the input() function.

The input() function pauses the program and waits for the user to enter a value.

Getting User Input

Example:

name = input("Enter your name: ")

print(name)

Output:

Enter your name: John
John

Input Always Returns a String

The input() function always returns the entered value as a string.

Example:

age = input("Enter your age: ")

print(type(age))

Output:

<class 'str'>

Converting Input to Integer

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

Example:

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

print(age)

Output:

Enter your age: 25
25

Converting Input to Float

Use the float() function to convert user input into a float.

Example:

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

print(price)

Output:

Enter price: 99.99
99.99

Taking Multiple Inputs

You can take multiple inputs and store them in different variables.

Example:

name = input("Enter your name: ")
city = input("Enter your city: ")

print(name)
print(city)

Output:

Enter your name: John
Enter your city: London
John
London

Using User Input in Calculations

Example:

num1 = int(input("Enter first number: "))
num2 = int(input("Enter second number: "))

print(num1 + num2)

Output:

Enter first number: 10
Enter second number: 20
30

Taking Multiple Values in One Line

Use split() to separate values entered in a single line.

Example:

name, age = input("Enter name and age: ").split()

print(name)
print(age)

Output:

Enter name and age: John 25
John
25

Practical Example

Create a simple welcome message using user input.

Example:

name = input("Enter your name: ")

print(f"Welcome, {name}!")

Output:

Enter your name: John
Welcome, John!

Common Mistakes

Adding numbers without converting input:

num1 = input("Enter first number: ")
num2 = input("Enter second number: ")

print(num1 + num2)

Output:

Enter first number: 10
Enter second number: 20
1020

Correct way:

num1 = int(input("Enter first number: "))
num2 = int(input("Enter second number: "))

print(num1 + num2)

Output:

30

Summary

• Use the input() function to get user input.
• Input values are returned as strings.
• Use int() and float() to convert input values.
• Multiple values can be accepted using split().
• User input can be used in calculations, conditions, and programs.