Python Built-in Methods – Python bin() Function

Python bin() Function

Convert an integer number to a binary string


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

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



Parameter Condition Description
number Required Any integer


x = bin(42)
# Prints 0b101010

You can pass a negative number to the function.

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

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

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

# octal
x = bin(0o12)
# 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')
# Prints 0b101010

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

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

# without prefix
x = f'{42:b}'
# Prints 101010


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