Python Basic Tutorial

Python Flow Control

The bytes() method returns an immutable byte object, which is initialized with the given size and data.

The syntax of the bytes() method is:

bytes([source[, encoding[, errors]]])

The bytes() method returns a bytes object, which is an immutable (cannot be modified) sequence of integers, ranging from 0 <= x <256.

If you want to use the variable version, please usebytearray()method.

bytes() has three optional parameters:

source (optional) -The array used to initialize bytes from the source.
encoding (optional) -The encoding of the string if source is a string.
errors (optional) -The action taken when the encoding conversion fails if source is a string (more information:String encoding)

The source parameter can be used to initialize the byte array as follows:

Different source parameters
Type	Description
String	To convert a string to bytes using str.encode(), you must also provideencoding　and optionalError
Integer	Create an array that provides size, and all arrays are initialized to null
Object	The read-only buffer of the object will be used to initialize the byte array
Iterable	Create an array of size equal to the count of the iterable, and initialize it with the elements of the iterable. It must be 0 <= x <256The integer between them is iterable
No source (arguments)	Create an array of size 0

The bytes() method returns a bytes object with the given size and initial value.

Example

string = "Python is interesting."
# Encoding as “utf-8”string
arr = bytes(string, 'utf-8)
print(arr)

When running the program, the output is:

b'Python is interesting.'

Example

size =　5
arr = bytes(size)
print(arr)

When running the program, the output is:

b'\x00\x00\x00\x00\x00'

Example

rList = [1,　2,　3,　4,　5]
arr = bytes(rList)
print(arr)

When running the program, the output is:

b'\x01\x02\x03\x04\x05'