 # Python bin()

In this tutorial, you will learn about the Python bin() method with the help of examples.

The `bin()` method converts a specified integer number to its binary representation and returns it.

### Example

``````number = 15

# convert 15 to its binary equivalent
print('The binary equivalent of 15 is', bin(number))

# Output: The binary equivalent of 15 is 0b1111``````

## bin() Syntax

The syntax of `bin()` method is:

``bin(number)``

## bin() Parameter

The `bin()` method takes in a single parameter:

• `number` - an integer whose binary equivalent is calculated

## bin() Return Value

The `bin()` method returns:

• the binary string equivalent to the given integer
• `TypeError` for a non-integer argument

## Example 1: Python bin()

``````number = 5

# convert 5 to its binary equivalent
print('The binary equivalent of 5 is:', bin(number))``````

Output

`The binary equivalent of 5 is: 0b101`

In the above example, we have used the `bin()` method to convert the argument 5 to its binary representation i.e. `101`.

Here, the prefix `0b` in the output `0b101` represents that the result is a binary string.

## Example 2: Python bin() with a Non-Integer Class

``````class Quantity:
apple = 1
orange = 2
grapes = 2

def func():
return apple + orange + grapes

print('The binary equivalent of quantity is:', bin(Quantity()))``````

Output

`TypeError: 'Quantity' object cannot be interpreted as an integer`

Here, we have passed an object of class `Quantity` to the `bin()` method and got a TypeError.

This is because we have used a non-integer class.

Note: We can fix the TypeError above by using the Python `__index__()` method with a non-integer class.

## Example 3: bin() with __index__() for Non-Integer Class

``````class Quantity:
apple = 1
orange = 2
grapes = 2

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

print('The binary equivalent of quantity is:', bin(Quantity()))``````

Output

`The binary equivalent of quantity is: 0b101`

Here, we have passed an object of class `Quantity` to the `bin()` method.

The `bin()` method doesn't raise a TypeError even if the object `Quantity()` is not an integer.

This is because we have used the `__index__()` method which returns an integer (in this case, sum of the fruits).