I'm working on creating a generic runtime engine for the Dabo
framework. Right now I'm focusing on Windows, since many of our
potential users are running on that platform. I've got py2exe and Inno
Setup running, so all that is well and good.
My question concerns the ability to generically run scripts as if they
were being run on an installed copy of Python. Many scripts have the
following structure:
if __name__ == "__main__":
method1()
method2()
...etc.
methodN()
When such a script is run with the command 'python myscript.py', the
various methods are called. However, when run with 'daborun
myscript.py', (daborun is the name of the py2exe file), nothing gets
executed, since when the call to 'myscript.py' is made, __name__ is now
set to 'myscript', and the statements after the 'if __name__' test are
never executed.
I have several ways of working around this, such as requiring that all
code after the 'if __name__' test be moved into a 'main()' method, and
having daborun call the main() method, but it would *so* much cooler to
be able to somehow fake out the value of __name__ when the call is made
to the script. Is this something that might be possible, or is it so
fundamental to the internals of Python that it can't be messed with?
___/
/
__/
/
____/
Ed Leafe http://leafe.com/ http://dabodev.com/ 5 2741
On Sun, 31 Oct 2004 17:05:59 -0500, Ed Leafe <ed@leafe.com> wrote: I'm working on creating a generic runtime engine for the Dabo framework. Right now I'm focusing on Windows, since many of our potential users are running on that platform. I've got py2exe and Inno Setup running, so all that is well and good.
My question concerns the ability to generically run scripts as if they were being run on an installed copy of Python. Many scripts have the following structure:
if __name__ == "__main__": method1() method2() ...etc. methodN()
When such a script is run with the command 'python myscript.py', the various methods are called. However, when run with 'daborun myscript.py', (daborun is the name of the py2exe file), nothing gets executed, since when the call to 'myscript.py' is made, __name__ is now set to 'myscript', and the statements after the 'if __name__' test are never executed.
I have several ways of working around this, such as requiring that all code after the 'if __name__' test be moved into a 'main()' method, and having daborun call the main() method, but it would *so* much cooler to be able to somehow fake out the value of __name__ when the call is made to the script. Is this something that might be possible, or is it so fundamental to the internals of Python that it can't be messed with?
Maybe this will give you a useful idea? print '%s\n%s%s'% ('-'*40, open('tmain.py').read(), '-'*40)
----------------------------------------
print 'before'
print 'localnames:', locals().keys(), locals()['__name__']
print 'globalnames:', globals().keys(), globals()['__name__']
if __name__ == '__main__':
print 'after'
---------------------------------------- def test():
... d = {'__name__': '__xxxx__'}
... execfile('tmain.py', d)
... test()
before
localnames: ['__builtins__', '__name__'] __xxxx__
globalnames: ['__builtins__', '__name__'] __xxxx__ def test():
... d = {'__name__': '__main__'}
... execfile('tmain.py', d)
... test()
before
localnames: ['__builtins__', '__name__'] __main__
globalnames: ['__builtins__', '__name__'] __main__
after
Note that __builtins__ gets injected, so it will be found in the execution context.
If you need the side effects of the execution, you can find them in the dict d (in
this example).
Regards,
Bengt Richter
On Oct 31, 2004, at 5:27 PM, Bengt Richter wrote: Maybe this will give you a useful idea?
Very useful; thanks! The runtime now runs script files that use the
'if __name__' construct. I would never have thought that you could
modify the local namespace like that.
___/
/
__/
/
____/
Ed Leafe http://leafe.com/ http://dabodev.com/ bo**@oz.net (Bengt Richter) wrote: On Sun, 31 Oct 2004 17:05:59 -0500, Ed Leafe <ed@leafe.com> wrote: >>> def test():
... d = {'__name__': '__xxxx__'} ... execfile('tmain.py', d)
I believe it is technically more Pythonic to use __import__ rather than
execfile, if only because you have access to the module itself when you
are done.
- Josiah
Josiah Carlson <jc******@uci.edu> wrote: bo**@oz.net (Bengt Richter) wrote: On Sun, 31 Oct 2004 17:05:59 -0500, Ed Leafe <ed@leafe.com> wrote: >>> def test(): ... d = {'__name__': '__xxxx__'} ... execfile('tmain.py', d)
I believe it is technically more Pythonic to use __import__ rather than execfile, if only because you have access to the module itself when you are done.
Unfortunately, while __import__ does take parameters giving local and
global namespaces, it doesn't use them in anywhere like the way that
execfile does. In particular, how would you "force __name__" with
__import__, as per this thread's subj? I don't think you can...
Alex
On Mon, 1 Nov 2004 10:06:09 +0200, al*****@yahoo.com (Alex Martelli) wrote: Josiah Carlson <jc******@uci.edu> wrote:
bo**@oz.net (Bengt Richter) wrote: > > On Sun, 31 Oct 2004 17:05:59 -0500, Ed Leafe <ed@leafe.com> wrote: > >>> def test(): > ... d = {'__name__': '__xxxx__'} > ... execfile('tmain.py', d)
I believe it is technically more Pythonic to use __import__ rather than execfile, if only because you have access to the module itself when you are done.
Unfortunately, while __import__ does take parameters giving local and global namespaces, it doesn't use them in anywhere like the way that execfile does. In particular, how would you "force __name__" with __import__, as per this thread's subj? I don't think you can...
It seems from a quick hack that you can fake it though, by importing a dummy
and filling it:
Python 2.3.2 (#49, Oct 2 2003, 20:02:00) [MSC v.1200 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information. print '%s\n%s%s' %('-'*40,open('empty.py').read(),'-'*40)
----------------------------------------
---------------------------------------- print '%s\n%s%s' %('-'*40,open('tmain.py').read(),'-'*40)
----------------------------------------
print 'before'
print 'bef localnames:', locals().keys(), locals()['__name__']
print 'bef globalnames:', globals().keys(), globals()['__name__']
glob_before = 'glob_before'
class Before(object):
def m(self): print glob_before, glob_after
if __name__ == '__main__':
glob_after = 'glob_after'
class After(object):
def m(self): print glob_before, glob_after
print 'after'
print 'aft localnames:', locals().keys(), locals()['__name__']
print 'aft globalnames:', globals().keys(), globals()['__name__']
---------------------------------------- import empty empty.__dict__['__name__']
'empty' empty.__dict__['__name__'] = '__main__' empty.__dict__['__name__']
'__main__' execfile('tmain.py', empty.__dict__)
before
bef localnames: ['__builtins__', '__name__', '__file__', '__doc__'] __main__
bef globalnames: ['__builtins__', '__name__', '__file__', '__doc__'] __main__
after
aft localnames: ['glob_before', '__builtins__', '__file__', 'After', 'glob_after', '__name__', '
__doc__', 'Before'] __main__
aft globalnames: ['glob_before', '__builtins__', '__file__', 'After', 'glob_after', '__name__',
'__doc__', 'Before'] __main__ dir(empty)
['After', 'Before', '__builtins__', '__doc__', '__file__', '__name__', 'glob_after', 'glob_before'] empty.Before().m()
glob_before glob_after empty.After().m()
glob_before glob_after empty.glob_before
'glob_before' empty.__name__='tmain' empty.__file__ = r'c:\pywk\clp\tmain.py'
help(empty)
Help on module tmain:
NAME
tmain
FILE
c:\pywk\clp\tmain.py
DATA
glob_after = 'glob_after'
glob_before = 'glob_before'
type(empty)
<type 'module'>
I haven't really explored all the ramifications ;-)
Regards,
Bengt Richter This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
by: Amy G |
last post by:
I have a program that needs a little help.
Right now the program runs in my crontab. When it runs, it sets a few
variables based on a query to a MySQL database. I would like to modify it
so that...
|
by: Eli Stevens \(WG.c\) |
last post by:
I have a question about proper Python style when it comes to having a main
function in a module. I'm fairly new to Python - a few months of
very-part-time tinkering (lots'o'Java at work, shrug);...
|
by: john_sips_tea |
last post by:
For writing testcode, it looks like there's three ways that it's
typically done:
(1). using the doctest module,
(2). using the unittest module (i.e. "pyunit"), or else
(3). just putting an...
|
by: Leo Breebaart |
last post by:
I have a simple question (I hope), but one I'd love to get some
feedback on in case I am missing something obvious:
If I have a Python script that is executable, and therefore
already uses '''if...
|
by: johnny |
last post by:
What is the purpose of
if __name__ == "__main__":
If you have a module, does it get called automatically?
| |
by: krishnakant Mane |
last post by:
hello all,
I had previously mentioned my doubt and confusion about having a
main() to be an entry point in my python based software.
I am still having a particular doubt.
I use cx freze for...
|
by: gtb |
last post by:
Hi,
I often see the following 'if' construct in python code. What does
this idiom accomplish? What happens if this is not main? How did I get
here if it is not main?
Thanks,
gtb
|
by: gtb |
last post by:
The lines
if __name__ == 'main':
someClass().fn()
appear at the end of many examples I see. Is this to cause a .class
file to be generated?
The last line of the sample below has a string...
|
by: benhoyt |
last post by:
Hi guys,
I've been using Python for some time now, and am very impressed with
its lack of red tape and its clean syntax -- both probably due to the
BDFL's ability to know when to say "no".
...
|
by: marktang |
last post by:
ONU (Optical Network Unit) is one of the key components for providing high-speed Internet services. Its primary function is to act as an endpoint device located at the user's premises. However,...
|
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...
| |
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...
|
by: Hystou |
last post by:
Overview:
Windows 11 and 10 have less user interface control over operating system update behaviour than previous versions of Windows. In Windows 11 and 10, there is no way to turn off the Windows...
|
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,...
|
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...
|
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...
|
by: TSSRALBI |
last post by:
Hello
I'm a network technician in training and I need your help.
I am currently learning how to create and manage the different types of VPNs and I have a question about LAN-to-LAN VPNs.
The...
| |
by: 6302768590 |
last post by:
Hai team
i want code for transfer the data from one system to another through IP address by using C# our system has to for every 5mins then we have to update the data what the data is updated ...
| |