`bin()` Function in Python [ English ]

Languages

• English

1. Introduction

The bin() function in Python is a built-in function used to convert an integer number into its binary representation. The binary number is returned as a string prefixed with 0b, which indicates that the number is in base-2 (binary system).

Binary numbers are widely used in computer systems and digital electronics, where numbers are represented using only two digits: 0 and 1.

2. Syntax

bin(number)

Parameter

• number An integer value that needs to be converted into binary format.

3. Return Value

• Returns a string representing the binary equivalent of the integer.
• The returned string always starts with 0b, which indicates binary format.

4. Basic Example

print(bin(10))

Output

0b1010

Explanation

• The decimal number 10 is converted into binary.
• The binary representation of 10 is 1010.
• Python adds the prefix 0b to indicate binary format.

5. Example with Another Number

print(bin(7))

Output

0b111

Explanation

• The decimal number 7 is represented in binary as 111.

6. Removing the 0b Prefix

Sometimes we may want only the binary digits without the prefix.

num = 10
binary = bin(num)

print(binary[2:])

Output

1010

Explanation

• binary[2:] removes the first two characters (0b) from the string.

7. Example with Negative Numbers

print(bin(-8))

Output

-0b1000

Explanation

• Python shows the binary value with a negative sign before the prefix.

8. Practical Example

number = 25

binary_value = bin(number)

print("Decimal:", number)
print("Binary:", binary_value)

Output

Decimal: 25
Binary: 0b11001

Explanation

• The decimal number 25 is converted to binary 11001.

9. Summary

• bin() is a built-in Python function used to convert an integer into its binary representation.
• The result is returned as a string.
• The output contains a 0b prefix, indicating binary format.
• It works only with integer values.
• It is useful for number system conversions and low-level programming tasks.