Python built-in Method - memoryview()

In Python, the memoryview() function is a built-in method that returns a memory view object of an argument. A memory view object is a Python object that provides a view on the memory of another object, which can be a bytes object, an array, or any object that supports the buffer protocol.

The syntax for memoryview() is as follows:

memoryview(obj)

Here, obj is the object that we want to create a memory view of.

For example:

my_bytes = b'hello'
my_memoryview = memoryview(my_bytes)
print(my_memoryview)    # <memory at 0x7f60f0716d00>

for byte in my_memoryview:
    print(byte)    # 104 101 108 108 111

In the example above, we create a bytes object my_bytes containing the string 'hello', and then create a memory view object my_memoryview of that bytes object using the memoryview() function. We print out the memory view object to see its memory address, and then loop over the bytes in the memory view using a for loop.

The memoryview() function is useful when you want to access the memory of an object directly, without creating a new object. This can be useful when working with large data sets, as it allows you to access the data without having to copy it to a new object. It can also be useful when working with binary data, as it allows you to manipulate the data at the byte level.

Note that the memoryview() function returns a read-only view of the memory of the object. If you want to modify the memory, you need to create a writable memory view by calling the memoryview() function with a writable buffer object, such as a bytearray object.