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# Python bin: How to Use bin() Function

The bin() function converts an integer number to a binary string. The result is a valid Python expression. The bin() is a built-in function that takes in integer x and returns the binary representation of x in a string format. If x is not an integer, then the _index()_ method must be implemented to obtain an integer as the return value instead of a “TypeError” exception.

## Python bin

Python bin() is a built-in method that converts a decimal to a binary data type. The bin() function returns a binary representation of an integer as the string. Python bin() reduces the time required to code and removes the hassle.

### Syntax

See the Python bin() function syntax.

`bin(number)`

### Arguments

The function bin() takes the number as a parameter converted to the binary number. If the number is not an integer, then the __index__() method is implemented to return the integer.

### Example

See the following code example.

`print("Binary of Eleven is:", bin(11))`

See the following output.

```➜  pyt python3 app.py
Binary of Eleven is: 0b1011
➜  pyt```

As you can see in the example above, the bin() function returns the equivalent binary number prefixed with 0b of an integer.

If you don’t want that prefixed 0b, you can use the format() function.

`print(format(11, 'b'))`

See the following output.

```➜  pyt python3 app.py
1011
➜  pyt```

### Converting an object to binary implementing __index__() method

See the following example in which we implement the object to the binary implementing __index__() method.

```class Add:
a = 11
b = 19

def __index__(self):
return self.a + self.b

print('Equivalent binary number is:', bin(app))
```

See the following output.

```➜  pyt python3 app.py
Equivalent binary number is: 0b11110
➜  pyt```

That is how the __index__() function is used to return an integer when we don’t have an integer as an argument in the Python bin() function.

### More Examples

See the following example.

```a = 11
b = bin(a)
print(type(b))
print(bin(a))```

See the output.

```➜  pyt python3 app.py
<class 'str'>
0b1011
➜  pyt```

The bin() method is available and compatible with Python version Python 2.x and 3.x.

## Using Python bin() with float

See the following code example of the bin() with the float.

```a = 11.19
print(bin(a))```

See the following output.

```➜  pyt python3 app.py
Traceback (most recent call last):
File "app.py", line 2, in <module>
print(bin(a))
TypeError: 'float' object cannot be interpreted as an integer
➜  pyt```

So, the bin() function can be used with the integers having different formats, such as octal hexadecimal. The function will take care of converting them into a binary string.

That’s all for the python bin() function to convert an integer to the binary string. We also learned that an Object could be converted to the binary string representation by implementing the __index__() function that returns an integer.

That’s it for this tutorial.

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