# Python Built-in Methods – Python bin() Function

Convert an integer number to a binary string

## Usage

The `bin()` function converts an integer number to a binary string.

The result will always be prefixed with `'0b'`.

## Syntax

bin(number)

 Parameter Condition Description number Required Any integer

## Examples

``````x = bin(42)
print(x)
# Prints 0b101010``````

You can pass a negative number to the function.

``````x = bin(-42)
print(x)
# Prints -0b101010``````

A number can be in hexadecimal (base 16) and octal (base 8) formats.

``````# hex
x = bin(0xF)
print(x)
# Prints 0b1111

# octal
x = bin(0o12)
print(x)
# Prints 0b1010``````

## Equivalent Method

You can achieve the same result by using format() function or f-string.

``````# using format() function

# with prefix
x = format(42, '#b')
print(x)
# Prints 0b101010

# without prefix
x = format(42, 'b')
print(x)
# Prints 101010``````
``````# using f-string

# with prefix
x = f'{42:#b}'
print(x)
# Prints 0b101010

# without prefix
x = f'{42:b}'
print(x)
# Prints 101010``````

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