Hello list,
I am following "Learning Python: Mark Lutz" and came across following in
chapter 3
few days back.
[quote]
* You may still have to reload nested modules. Technically speaking, IDLE's
Run->Run Module menu option always runs the current version of the top-level
file
only; imported
>From the discussions in this thread, I get the impression that there are
>genuine
requirements to reload() a module during a program's execution.
It is fairly easy to see reload() in context of interactive execution, but how
does it
come into picture in case of non-interactive Python program ex
Based on the input from members, and my subsequent reading the
textbook/tutorials, let
me summarize my understanding of "why subsequent imports of same module are
designed to be effect-less".
1. Imports are costly affair, as it involves
- finding the module's file
- compile it to byte code (if
Steven,
> There are better ways to manage your Python path than to manually insert
> paths into sys.path like that. What version of Python are you using?
I would love to know, apart from PYTHONPATH and sys.path.append() route.
I am using Python 2.7.11 to start with as suggested by my employer.
-
> Why does one use (something like) idle?
> To experiment.
>
> So what's your experiment-focus?
True. Experiment only.
What happens (and in environment) when you use
- import module
- from module import name
- from module import name as othername
Idle is start point, but we aren't always going t
> As for need of import in Idle session, I use it to
> - import sys
> - sys.append.path('D:\\Where\\Ever\\My\\Modules\\Lie')
Kindly read above as
sys.path.append()
> - import mymodule
--
https://mail.python.org/mailman/listinfo/python-list
Hello Rustom,
F5 in Idle restarts the Python interpreter (that's what my impression is).
Whatever you have done earlier at Idle prompt (in Idle session) before F5 is
gone after F5.
Try simple experiment at prompt.
>>> myvar="hello"
>>> myvar
'hello'
myvar is gone after F5.
As for need of imp
Thanks Chris and Ian,
Your suggested experiments and explanations have really provided some good
insights, something Tutorial didn't indicate.
Ian's explanation reminds me of
#ifndef _HEADER_H_
#define _HEADER_H_
...
#endif // _HEADER_H_
in C/C++, and I can draw parallels to why subsequent a
Hello list,
We can not import a module twice in a session of Python (subsequent attempts to
import same module don't result in any error though, but it is not-effective).
However after making change to module, we can reload() it (if not reload(), we
could possibly have reimport statement) to ge
