Cara menggunakan python bytes length

Question

In this tutorial, we will learn about the Python bytes() method with the help of examples.

Table of Contents Show

bytes() Syntax
bytes() Parameters
bytes() Return Value
Example 1: Convert string to bytes
Example 2: Create a byte of given integer size
Example 3: Convert iterable list to bytes
How do you find the byte size of an array?
How do I get the size of an array in JavaScript?
What is array size in JavaScript?
Is JavaScript array fixed size?

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

Example

message = 'Python is fun'

# convert string to bytes
byte_message = bytes(message, 'utf-8')
print(byte_message)

# Output: b'Python is fun'

bytes() Syntax

The syntax of bytes() method is:

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

bytes() method returns a bytes object which is an immutable (cannot be modified) sequence of integers in the range 0 <=x < 256.

If you want to use the mutable version, use the bytearray() method.

bytes() Parameters

bytes() takes three optional parameters:

source (Optional) - source to initialize the array of bytes.
encoding (Optional) - if the source is a string, the encoding of the string.
errors (Optional) - if the source is a string, the action to take when the encoding conversion fails (Read more: String encoding)

The source parameter can be used to initialize the byte array in the following ways:

Type	Description
String	Converts the string to bytes using str.encode() Must also provide encoding and optionally errors
Integer	Creates an array of provided size, all initialized to null
Object	A read-only buffer of the object will be used to initialize the byte array
Iterable	Creates an array of size equal to the iterable count and initialized to the iterable elements Must be iterable of integers between `0 <= x < 256`
No source (arguments)	Creates an array of size 0

bytes() Return Value

The bytes() method returns a bytes object of the given size and initialization values.

Example 1: Convert string to bytes

string = "Python is interesting."

# string with encoding 'utf-8'
arr = bytes(string, 'utf-8')




print(arr)

Output

b'Python is interesting.'

Example 2: Create a byte of given integer size

size = 5

arr = bytes(size)
print(arr)

Output

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

Example 3: Convert iterable list to bytes

rList = [1, 2, 3, 4, 5]

arr = bytes(rList)
print(arr)

Output

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

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	function memorySizeOf(obj) {
	var bytes = 0;

	function sizeOf(obj) {
	if(obj !== null && obj !== undefined) {
	switch(typeof obj) {
	case 'number':
	bytes += 8;
	break;
	case 'string':
	bytes += obj.length * 2;
	break;
	case 'boolean':
	bytes += 4;
	break;
	case 'object':
	var objClass = Object.prototype.toString.call(obj).slice(8, -1);
	if(objClass === 'Object' \|\| objClass === 'Array') {
	for(var key in obj) {
	if(!obj.hasOwnProperty(key)) continue;
	sizeOf(obj[key]);
	}
	} else bytes += obj.toString().length * 2;
	break;
	}
	}
	return bytes;
	};

	function formatByteSize(bytes) {
	if(bytes < 1024) return bytes + " bytes";
	else if(bytes < 1048576) return(bytes / 1024).toFixed(3) + " KiB";
	else if(bytes < 1073741824) return(bytes / 1048576).toFixed(3) + " MiB";
	else return(bytes / 1073741824).toFixed(3) + " GiB";
	};

	return formatByteSize(sizeOf(obj));
	};

How do you find the byte size of an array?

Basic Principle of sizeof Operator to Calculate the Size of Array. Memory required (in bytes) = sizeof (datatype) * sizeof array.

How do I get the size of an array in JavaScript?

Description. JavaScript array length property returns an unsigned, 32-bit integer that specifies the number of elements in an array..

Syntax. Its syntax is as follows − array.length..

Return Value. Returns the length of the array..

Example. Try the following example. ... .

Output. arr.length is : 3..

What is array size in JavaScript?

What exactly is the JavaScript Array length property. By definition, the length property of an array is an unsigned, 32-bit integer that is always numerically greater than the highest index in the array. The value of the length is 232. It means that an array can hold up to 4294967296 (232) elements.