Input From User

Nerd Cafe | نرد کافه

1. What is User Input in Python?

Definition:

User input means taking data from a human (the user) while the program is running. In Python, this is done using the input() function.

Syntax:

input("Prompt message")

• "Prompt message" is optional text shown to the user as a guide.

• The input is always stored as a string, even if the user types a number.

👉 If you need numbers, you must convert them using int(), float(), etc.

2. Basic Input Example

name = input("What is your name? ")
print("Hello,", name)

Output:

What is your name? Alice
Hello, Alice

💡 Example in practice:

• If you are making a login screen, you can ask for a username or email address using input.

3. Input with Conversion (Numbers)

Integers

age = int(input("Enter your age: "))
print("You will be", age + 1, "next year.")

Output:

Enter your age: 21
You will be 22 next year.

⚠️ Practical Note: If the user types a word (like "twenty"), the program will crash. We’ll learn how to fix that using error handling later.

Floats (Decimal Numbers)

weight = float(input("Enter your weight (kg): "))
print("Your weight in grams is", weight * 1000)

Output:

Enter your weight (kg): 65.5
Your weight in grams is 65500.0

4. Taking Multiple Inputs at Once

You can ask the user to enter multiple values in one line, separated by spaces (or commas).

x, y = input("Enter two numbers separated by space: ").split()
x = int(x)
y = int(y)
print("Sum:", x + y)

Output:

Enter two numbers separated by space: 5 7
Sum: 12

👉 .split() breaks input into pieces (default: space).

Example with commas:

a, b, c = input("Enter three numbers separated by commas: ").split(',')
print("Numbers are:", a, b, c)

Output:

Enter three numbers separated by commas: 10,20,30
Numbers are: 10 20 30

5. Summary Table

Purpose	Code Example	Notes
Basic text input	name = input("Name: ")	Always returns a string
Number input	num = int(input()) / float(input())	Must convert to numeric types
Multiple inputs	a, b = input().split()	.split() separates by spaces

6. Video Tutorial

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Keywords

input, print, string, integer, float, split, list, tuple, dictionary, try, except, while, if, else, conversion, error, prompt, nerd cafe , نرد کافه

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