Why os.move() Sometimes Does Not Work And Why shutil.move() Is The Savior?

Sun, 28 Jan 2018 21:16:30 +0000

Recently I ran into an issue where this, for example, code fails:

import os

os.rename('/foo/a.txt', '/bar/b.txt')

Traceback (most recent call last):
File "", line 1, in
OSError: [Errno 18] Invalid cross-device link

The documentation for the os module says that sometimes it might fail when the source and the destination are on different file-systems:

os.rename( src, dst, *, src_dir_fd=None, dst_dir_fd=None)

Rename the file or directory src to dst. If dst is a directory, OSError will be raised. On Unix, if dst exists and is a file, it will be replaced silently if the user has permission. The operation may fail on some Unix flavors if src and dst are on different filesystems. If successful, the renaming will be an atomic operation (this is a POSIX requirement). On Windows, if dst already exists, OSError will be raised even if it is a file.

What is Actually True and False in Python?

Thu, 04 Jan 2018 23:15:06 +0000

Intro

Did you know that in Python 2.x you can do the following?

$ python2
Python 2.7.14 (default, Sep 20 2017, 01:25:59)
[GCC 7.2.0] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> True = False
>>> False
False
>>> True
False
>>> not True
True
>>> True == False
True
>>> True != False
False

How can it be that not True is True and True is equal to False? Why is it even possible to do this? Isn’t what is True and False in the language defined to be constant and unchangeable? What sense does it make to change the meaning of what is True and what is False? In any way, to fix this bug in the matrix, do this:

Python on Giedrius Statkevičius

Why os.move() Sometimes Does Not Work And Why shutil.move() Is The Savior?

What is Actually True and False in Python?

Intro