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Python memoryview() Function
The memoryview() function in Python returns the memoryview object from a specified object (byte or bytearray). For example:
x = memoryview(bytes("Python", "utf-8")) print(x) x = memoryview(bytearray("Python", "utf-8")) print(x)
The snapshot given below shows the sample output produced by above Python program, demonstrating the memoryview() function:
Note: To learn about memoryview object, refer to its separate tutorial.
Python memoryview() Function Syntax
The syntax of memoryview() function in Python is:
memoryview(obj)
where obj is an object of either bytes type or bytearray type.
Python memoryview() Function Example
Here is a simple example of memoryview() function in Python. This program initializes a bytes type to a variable x, then the variable gets converted into memoryview, to print the Unicode of particular character using index:
x = bytes("fresherearth", "utf-8") x = memoryview(x) print("Unicode of First Character:", x[0]) print("Unicode of Third Character:", x[2]) print("Unicode of Last Character:", x[len(x)-1])
Here is its sample output:
Here is the actual example, that shows why memoryview is useful to optimize the program in Python:
import time n = 400000 data = b'a' * n start = time.time() while data: data = data[1:] tm = time.time() - start print("Time taken for", n, "iterations (without memoryview):", tm, "sec") n = 400000 data = b'a' * n data = memoryview(data) start = time.time() while data: data = data[1:] tm = time.time() - start print("Time taken for", n, "iterations (with memoryview):", tm, "sec")
The sample output of this program, is shown in the snapshot given below:
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