Python int(): Convert to an Integer

The int() function converts a number or string into an integer. It’s useful for math operations, handling user input, and working with numerical data.

Example

num = int("10")
print(num)  
# Output: 10

This converts a string into an integer.

Syntax

int(value, base=10)

value → The number or string to convert.
base (optional) → The base for conversion (default is 10).
Returns → An integer.

1. Converting Floats to Integers

The decimal part is removed (not rounded).

print(int(5.9))  
# Output: 5

Useful when you need whole numbers only.

2. Converting Strings to Integers

num = int("123")
print(num)  
# Output: 123

Works if the string contains only digits.

3. Converting Binary, Octal, and Hexadecimal

Use base to convert numbers from different bases.

print(int("101", 2))  # Binary to decimal → Output: 5
print(int("77", 8))   # Octal to decimal → Output: 63
print(int("1F", 16))  # Hex to decimal → Output: 31

Great for working with different numbering systems.

4. Handling User Input Safely

try:
    age = int(input("Enter your age: "))
    print("Your age:", age)
except ValueError:
    print("Invalid input! Please enter a number.")

Prevents crashes when users enter non-numeric values.

Key Notes

✔ Converts numbers and strings to integers.
✔ Ignores decimal parts (does not round).
✔ Supports different bases (binary, octal, hex).
✔ Handle user input safely with try-except.

By using int(), you can work with numerical data easily, making your code efficient and error-free. 🚀