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Srinivas Ramakrishna for ItsMyCode

Posted on • Originally published at itsmycode.com on

# Python bin()

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The `bin()` is a built-in function in Python that takes an integer and returns the binary equivalent of the integer in string format. If the given input is not an integer, then the `__index__ ()` method needs to be implemented to return an integer. Otherwise, Python will throw a TypeError exception.

## bin() Syntax

The syntax of the*`bin()`* method is

``````**bin(num)**
``````

## bin() Parameters

The `bin()` function takes a single argument, an integer whose binary representation will be returned.

If the given input is not an integer, then the `__index__ ()` method needs to be implemented to return a valid integer.

## bin() Return Value

The `bin()` method returns the binary equivalent string of the given integer.

Exceptions: ** Raises **TypeError when a float value is given as an input to the `bin()`function.

## Example 1: Convert integer to binary using bin() method

``````# Python code to demonstrate the bin() function
number = 100
print('The binary equivalent of 100 is:', bin(number))
``````

Output

``````The binary equivalent of 100 is: 0b1100100
``````

## Example 2: TypeError: βfloatβ object cannot be interpreted as an integer

``````# Python code to demonstrate the bin() function
number = 100.66
print('The binary equivalent of 100 is:', bin(number))
``````

Output

``````raceback (most recent call last):
File "c:\Projects\Tryouts\main.py", line 3, in <module>
print('The binary equivalent of 100 is:', bin(number))
TypeError: 'float' object cannot be interpreted as an integer
``````

## Example 3: Convert an object to binary implementing __index__() method

In the below example, we are sending the *TotalPrice * class object to the bin() method.

The `bin()` method does not raise an exception even if the argument passed is not of integer type since we have implemented the `__index__ ()` method in our class, which always returns the positive integer.

``````# Python code to demonstrate the bin() function using __index__ ()
class TotalPrice:
apple = 100
orange = 50
watermelon=22

def __index__ (self):
return self.apple + self.orange + self.watermelon

print('The binary equivalent of Total Price object is:', bin(TotalPrice()))
``````

Output

``````The binary equivalent of Total Price object is: 0b10101100
``````

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