I'm reading the "What's New" section of the 2.5 docs, and I'm a little
confused by the last section of "Absolute and Relative Imports":
-----------------------------------------------
For example, code in the A.B.C module can do:
from . import D # Imports A.B.D
from .. import E # Imports A.E
from ..F import G # Imports A.F.G
-----------------------------------------------
Can someone explain this? It seems like information is missing. How do
you know where D, E, F and G are to figure this out? If all you are
given is A.B.C, and then someone gives you the above three examples,
what steps do you take to figure out what gets imported from where?
Thanks,
John
5  1148 
John Salerno wrote:
I'm reading the "What's New" section of the 2.5 docs, and I'm a little
confused by the last section of "Absolute and Relative Imports":
-----------------------------------------------
For example, code in the A.B.C module can do:
from . import D # Imports A.B.D
from .. import E # Imports A.E
from ..F import G # Imports A.F.G
-----------------------------------------------
Can someone explain this? It seems like information is missing. How do
you know where D, E, F and G are to figure this out? If all you are
given is A.B.C, and then someone gives you the above three examples,
what steps do you take to figure out what gets imported from where?
What is ambiguous about A.B.D, A.E, and A.F.G? But if you like:
A/
B/
C.py
D.py
E.py
F/
G.py
--
Robert Kern
"I have come to believe that the whole world is an enigma, a harmless enigma
that is made terrible by our own mad attempt to interpret it as though it had
an underlying truth."
-- Umberto Eco
Robert Kern wrote:
What is ambiguous about A.B.D, A.E, and A.F.G? But if you like:
I guess maybe I was looking at it backwards. From the way it was worded,
I thought the only information we had to use was the structure A.B.C,
and then given a statement like:
from . import D
we just had to figure out for ourselves that this results in A.B.D,
instead of, for example, A.C.D, or any other possibility.
But I'm still a little confused about the use of the single or double
period. In this case:
from . import D # Imports A.B.D
from .. import E # Imports A.E
why do you need a single period in the first example, and a double in
the second, if they both are importing from A? If E is directly under A,
couldn't you just use a single period? And since D is nested twice
beneath A (i.e., in A, then in B), wouldn't you need two periods there
instead?
John Salerno wrote:
Robert Kern wrote:
What is ambiguous about A.B.D, A.E, and A.F.G? But if you like:
I guess maybe I was looking at it backwards. From the way it was worded,
I thought the only information we had to use was the structure A.B.C,
and then given a statement like:
from . import D
we just had to figure out for ourselves that this results in A.B.D,
instead of, for example, A.C.D, or any other possibility.
But I'm still a little confused about the use of the single or double
period. In this case:
from . import D # Imports A.B.D
from .. import E # Imports A.E
why do you need a single period in the first example, and a double in
the second, if they both are importing from A? If E is directly under A,
couldn't you just use a single period? And since D is nested twice
beneath A (i.e., in A, then in B), wouldn't you need two periods there
instead?
I was staring at this too for a bit.
You just have to remember basic directory relative paths:
.. -Current Directory
... -One level up from current.
At least I'm assuming this is right based on the test and the example
above.
John Salerno wrote:
Robert Kern wrote:
>What is ambiguous about A.B.D, A.E, and A.F.G? But if you like:
I guess maybe I was looking at it backwards. From the way it was worded,
I thought the only information we had to use was the structure A.B.C,
and then given a statement like:
from . import D
we just had to figure out for ourselves that this results in A.B.D,
instead of, for example, A.C.D, or any other possibility.
But I'm still a little confused about the use of the single or double
period. In this case:
from . import D # Imports A.B.D
from .. import E # Imports A.E
why do you need a single period in the first example, and a double in
the second, if they both are importing from A? If E is directly under A,
couldn't you just use a single period? And since D is nested twice
beneath A (i.e., in A, then in B), wouldn't you need two periods there
instead?
Remember that this is code in the A.B.C module. The first form looks for modules
in the A.B package, that is, next to A.B.C . The second looks for modules in the
A package, next to A.B .
--
Robert Kern
"I have come to believe that the whole world is an enigma, a harmless enigma
that is made terrible by our own mad attempt to interpret it as though it had
an underlying truth."
-- Umberto Eco
Robert Kern wrote:
Remember that this is code in the A.B.C module.
Oh! That clears it all up! I wasn't realizing that the import statements
were being executed from within the C module! Thanks! :) This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
by: Rutger Claes |
last post by:
In the directory /var/www/dynamo/xsl is the basic xsl file for xhtml
documents /var/www/dynamo/xsl/xhtml.xsl. In this file there is an import
statement: <xsl:import href="xhtml/basic.xhtml.xsl" />.
This import statement should load /var/www/dynamo/xsl/xhtml/basic.xhtml.xsl
as far as I know.
The current document is /var/www/dynamo/xml/index.xml (.xml documents are
handled by the PHP parser on my server). This is the error message I get:...
|
by: Randall Smith |
last post by:
I've noticed the push by Guido and others to use absolute imports
instead of relative imports. I've always enjoyed the ease of relative
imports, but am starting to understand that "explicit is better than
implicitly" as the Python philosophy goes. I'm trying to develop a
strategy for writing packages using only absolute imports and would
really like to know what others have learned.
Randall
|
by: Anders J. Munch |
last post by:
Now 2.5 is out, and we have a syntax for explicit relative imports
(PEP 328, http://www.python.org/dev/peps/pep-0328/, in case anyone
wasn't paying attention). The long-term plan is that the classical
import syntax becomes absolute import only, so that all imports are
explicitly one or the other.
You can only use relative import from within packages. Trying to
import a top-level module relatively from within same directory,
produces...
|
by: Alexey Borzenkov |
last post by:
After reading PEP-0328 I wanted to give relative imports a try:
# somepkg/__init__.py
<empty>
# somepkg/test1.py
from __future__ import absolute_import
from . import test2
if __name__ == "__main__":
|
by: Alan Isaac |
last post by:
Are relative imports broken in 2.5?
Directory ``temp`` contains::
__init__.py
test1.py
test2.py
File contents:
__init__.py and test2.py are empty
test1.py contains a single line::
| | |
by: rbygscrsepda |
last post by:
Hi, I'm a newbie at Python. :) Right now it's not letting me import *
from any relative package name--i.e., a name that starts with a dot.
For instance, none of the following work:
from . import *
from .sibiling import *
from .. import *
from ..parent_sibling import *
....and so on. The same error occurs:
|
by: Kay Schluehr |
last post by:
Since their introduction in Python 2.5 I only reviewed the new
"relative import" notation briefly by reading the "What's new in
Python 2.5" article. Now I wanted checkout if I get comfortable with
them.
Opening the tutorial I found following notice ( 6.4.2 ):
"Note that both explicit and implicit relative imports are based on
the name of the current module.
Since the name of the main module is always "__main__", modules
|
by: DG |
last post by:
Alright, I have searched and searched and read many conversations on
the topic of relative and absolute imports and am still not getting
the whole thing through my skull.
Highlights of what I've read:
http://mail.python.org/pipermail/python-list/2007-January/422973.html
http://groups.google.com/group/comp.lang.python/browse_thread/thread/b1e8dc93471a7079/8751c82cfe1ca3f2?lnk=gst&q=absolute+import#8751c82cfe1ca3f2...
|
by: Gabriel Genellina |
last post by:
En Sat, 18 Oct 2008 05:52:04 -0300, Stef Mientki <stef.mientki@gmail.com>
escribió:
Why don't you let the caller tell you its own location, using __file__?
The above code is too much magic for me.
Yes.
|
by: Hystou |
last post by:
Most computers default to English, but sometimes we require a different language, especially when relocating. Forgot to request a specific language before your computer shipped? No problem! You can effortlessly switch the default language on Windows 10 without reinstalling. I'll walk you through it.
First, let's disable language synchronization. With a Microsoft account, language settings sync across devices. To prevent any complications,...
|
by: Oralloy |
last post by:
Hello folks,
I am unable to find appropriate documentation on the type promotion of bit-fields when using the generalised comparison operator "<=>".
The problem is that using the GNU compilers, it seems that the internal comparison operator "<=>" tries to promote arguments from unsigned to signed.
This is as boiled down as I can make it.
Here is my compilation command:
g++-12 -std=c++20 -Wnarrowing bit_field.cpp
Here is the code in...
| | |
by: jinu1996 |
last post by:
In today's digital age, having a compelling online presence is paramount for businesses aiming to thrive in a competitive landscape. At the heart of this digital strategy lies an intricately woven tapestry of website design and digital marketing. It's not merely about having a website; it's about crafting an immersive digital experience that captivates audiences and drives business growth.
The Art of Business Website Design
Your website is...
|
by: agi2029 |
last post by:
Let's talk about the concept of autonomous AI software engineers and no-code agents. These AIs are designed to manage the entire lifecycle of a software development project—planning, coding, testing, and deployment—without human intervention. Imagine an AI that can take a project description, break it down, write the code, debug it, and then launch it, all on its own....
Now, this would greatly impact the work of software developers. The idea...
|
by: isladogs |
last post by:
The next Access Europe User Group meeting will be on Wednesday 1 May 2024 starting at 18:00 UK time (6PM UTC+1) and finishing by 19:30 (7.30PM).
In this session, we are pleased to welcome a new presenter, Adolph Dupré who will be discussing some powerful techniques for using class modules.
He will explain when you may want to use classes instead of User Defined Types (UDT). For example, to manage the data in unbound forms.
Adolph will...
|
by: conductexam |
last post by:
I have .net C# application in which I am extracting data from word file and save it in database particularly. To store word all data as it is I am converting the whole word file firstly in HTML and then checking html paragraph one by one.
At the time of converting from word file to html my equations which are in the word document file was convert into image.
Globals.ThisAddIn.Application.ActiveDocument.Select();...
|
by: adsilva |
last post by:
A Windows Forms form does not have the event Unload, like VB6. What one acts like?
|
by: muto222 |
last post by:
How can i add a mobile payment intergratation into php mysql website.
| | |
by: bsmnconsultancy |
last post by:
In today's digital era, a well-designed website is crucial for businesses looking to succeed. Whether you're a small business owner or a large corporation in Toronto, having a strong online presence can significantly impact your brand's success. BSMN Consultancy, a leader in Website Development in Toronto offers valuable insights into creating effective websites that not only look great but also perform exceptionally well. In this comprehensive...
| |
