Python bin() Function: Use, Syntax, and Examples

Python bin() function: In this tutorial, we will learn about the bin() function in Python with its use, syntax, parameters, returns type, and examples. By IncludeHelp Last updated : June 23, 2023

Python bin() function

The bin() function is a library function in Python, it is used to get the binary value of a number, it accepts a number and returns an equivalent binary string.


The following is the syntax of bin() function:



The following are the parameter(s):

  • number – A valid number whose value can be converted to the binary.

Return Value

The return type of bin() function is <class 'str'>, it returns string containing binary value of given number.

Python bin() Function: Example 1

# python code to convert number to binary
# an example of bin() function in Python

num1 = 55   # number (+ve)
num2 = -55  # number (-ve)

# converting to binary 
bin_str = bin(num1)
print("Binary value of ", num1, " is = ", bin_str)

bin_str = bin(num2)
print("Binary value of ", num2, " is = ", bin_str)


Binary value of  55  is =  0b110111
Binary value of  -55  is =  -0b110111

Python bin() Function: Example 2

If the input value is not a valid integer, the method returns a TypeError.

# bin() with non-integer value

x = 10.2



Traceback (most recent call last):
  File "", line 5, in <module>
TypeError: 'float' object cannot be interpreted as an integer

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