bytearray() method returns a bytearray object which is an array of given bytes. It gives a mutable sequence of integers in the range 0 <= x < 256.
Syntax of bytearray() Function in Python
Python bytearray() function has the following syntax:
Syntax: bytearray(source, encoding, errors)
Parameters:
- source[optional]: Initializes the array of bytes
- encoding[optional]: Encoding of the string
- errors[optional]: Takes action when encoding fails
Returns: Returns an array of bytes of the given size.
source parameter can be used to initialize the array in few different ways. Let’s discuss each one by one with help of examples.
Python bytearray() Function Examples
Let us see a few examples, for a better understanding of the bytearray() function in Python.
bytearray() Function on String
In this example, we are taking a Python String and performing the bytearray() function on it. The bytearray() encodes the string and converts it to bytes using str.encode()
Python3
str = "GeeksforLazyroar"# encoding the string with unicode 8 and 16array1 = bytearray(str, 'utf-8')array2 = bytearray(str, 'utf-16')print(array1)print(array2) |
Output:
bytearray(b'GeeksforLazyroar') bytearray(b'\xff\xfeG\x00e\x00e\x00k\x00s\x00f\x00o\x00r\x00g\x00e\x00e\x00k\x00s\x00')
bytearray() Function on an Integer
In this example, an integer is passed to the bytesrray() function, which creates an array of that size and initialized with null bytes.
Python3
# size of arraysize = 3# will create an array of given size# and initialize with null bytesarray1 = bytearray(size)print(array1) |
Output:
bytearray(b'\x00\x00\x00')
bytearray() Function on a byte Object
In this example, we take a byte object. The read-only buffer will be used to initialize the bytes array.
Python3
# Creates bytearray from byte literalarr1 = bytearray(b"abcd")# iterating the valuefor value in arr1: print(value) # Create a bytearray objectarr2 = bytearray(b"aaaacccc")# count bytes from the bufferprint("Count of c is:", arr2.count(b"c")) |
Output:
97 98 99 100 Count of c is: 4
bytearray() Function on a List of Integers
In this example, We take a Python List of integers which is passed as a parameter to the bytearray() function.
Python3
# simple list of integerslist = [1, 2, 3, 4]# iterable as sourcearray = bytearray(list)print(array)print("Count of bytes:", len(array)) |
Output:
bytearray(b'\x01\x02\x03\x04') Count of bytes: 4
bytearray() Function with no Parameters
If no source is provided to the bytearray() function, an array of size 0 is created.
Python3
# array of size 0 will be created# iterable as sourcearray = bytearray()print(array) |
Output:
bytearray(b'')
