Python memoryview() Function
Returns a memory view of an object.
Syntax
Python
Copy Code
memoryview(object)
Parameters
| Parameter | Description |
|---|---|
object |
Required. The object for which the memoryview will be created. |
A memoryview allows Python code to
access the internal data of an object without
copying the data first, which can be a significant performance improvement.
Working on binary data in a large image is a good example, where we don't want
to create a copy of the entire image to manipulate its pixels. The object
must support the buffer protocol.
Built-in objects that support the buffer protocol include bytes
and bytearray. Other objects that support the buffer protocol
include the Python Image Library (PIL), NumPy arrays, SQLlite databases.
Example
Python
Copy Code
myByteArray = bytearray('ABC', 'utf-8') view = memoryview(myByteArray) print(myByteArray) view[0] = 97 # lowercase a view[1] = 98 # lowercase b view[2] = 99 # lowercase c print(myByteArray)
Output
bytearray(b'ABC') bytearray(b'abc')