The **`bytes()` function** in Python converts an object to an immutable byte object initialized with a given size and given data.

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## Syntax

The `bytes()` function can be declared as shown in the code snippet below:

---
    bytes(src, enc, error)
---

## Parameters

* **`src`**: The source object which has to be converted.

* **`enc`**: The encoding of the string.

* **`error`**: Specifies the way to handle any error.


 * All parameters of the `bytes()` function are optional.

 * If `src` is a string and `enc` is not passed as a parameter, then the `bytes()` function returns `TypeError`.

## Return value

The `bytes()` function converts an object to an immutable byte object and returns it.

## Code

The code below demonstrates the use of the `bytes()` function:

str = "Hello world!"
toBytes = bytes(str, 'utf-8')
print(toBytes)

## Explanation
A string `str` is declared in *line 1*. The `bytes()` method is used in *line 2* to convert `str` to bytes.

What is the bytes() function in Python?

The bytes() function converts an object to an immutable byte object, requiring optional parameters for source, encoding, and error handling.