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Python: memoryview() function

memoryview() function

The memoryview() function is used to get a memory view object from a specified object.

Version:

(Python 3.2.5)

Syntax:

memoryview(obj)

Parameter:

Name Description Required /
Optional
obj A memoryview that references obj. obj must support the buffer protocol. Built-in objects that support the buffer protocol include bytes and bytearray. Required

Return value:

A memory view object of the given object.

Example: Python memoryview() function

#random bytearray
randomByteArray = bytearray('xyz', 'utf-8')

a = memoryview(randomByteArray)

# access memory view's zeroth index
print(a[0])

# create byte from memory view
print(bytes(a[0:4]))

# create list from memory view
print(list(a[0:6]))

Output:

120
b'xyz'
[120, 121, 122]

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Python: Tips of the Day

Find current directory and file's directory:

To get the full path to the directory a Python file is contained in, write this in that file:

import os 
dir_path = os.path.dirname(os.path.realpath(__file__))

(Note that the incantation above won't work if you've already used os.chdir() to change your current working directory, since the value of the __file__ constant is relative to the current working directory and is not changed by an os.chdir() call.)

To get the current working directory use

import os
cwd = os.getcwd()

Documentation references for the modules, constants and functions used above:

  • The os and os.path modules.
  • The __file__ constant
  • os.path.realpath(path) (returns "the canonical path of the specified filename, eliminating any symbolic links encountered in the path")
  • os.path.dirname(path) (returns "the directory name of pathname path")
  • os.getcwd() (returns "a string representing the current working directory")
  • os.chdir(path) ("change the current working directory to path")

Ref: https://bit.ly/3fy0R6m