Python built-in Method - bytearray()

The bytearray() method is a built-in function in Python that creates a mutable bytearray object from an iterable of integers in the range 0 to 255. A bytearray is similar to a regular Python string, but it can be modified in place by changing the values of its individual elements.

Here is the syntax for bytearray() method:

bytearray(iterable)

where iterable is an iterable object containing integers in the range 0 to 255.

Here are some examples of how to use bytearray():

# Create a bytearray from a list of integers
a = bytearray([72, 101, 108, 108, 111])
print(a)  # Output: bytearray(b'Hello')

# Create a bytearray from a string
b = bytearray('hello', 'utf-8')
print(b)  # Output: bytearray(b'hello')

In the first example, a list of integers representing the ASCII codes for the characters 'H', 'e', 'l', 'l', and 'o' is passed as an argument to the bytearray() method, which creates a bytearray object containing those values. The resulting bytearray is printed to the console, and the output shows that it contains the string 'Hello'.

In the second example, a string 'hello' is passed as an argument to the bytearray() method, along with the 'utf-8' encoding parameter. The utf-8 encoding is used to convert the string to a sequence of bytes, which is then used to create the bytearray object. The resulting bytearray is printed to the console, and the output shows that it contains the string 'hello'.

The bytearray() method can be useful when you need to work with byte data, such as when reading and writing binary files or communicating with hardware that uses byte-oriented protocols. Since bytearray objects are mutable, they can be modified in place, which can be useful for optimizing performance or reducing memory usage in certain applications.