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
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