Need to write python source with python

Tue Feb 28 14:36:00 EST 2012

On Tuesday, February 28, 2012 11:25:33 AM UTC-8, Peter Otten wrote:
> crstop at gmail.com wrote:
>> > On Tuesday, February 28, 2012 9:56:43 AM UTC-8, Peter Otten wrote:
> >> crstop at gmail.com wrote:
> >> 
> >> > I'm new to Python but have experience with a few other programming
> >> > languages(Java, Perl, JavaScript).
> >> > 
> >> > I'm using Python 2.7.2 and I'm trying to create and write to a file
> >> > (.py) a python class and functions from python. I will also need to
> >> > later read and edit the file. I realize I could just write strings
> >> > using the available string and file writing methods but suspect there
> >> > is a better way than that.
> >> > 
> >> > I have read about pickle, ast, and Django; searched this group and the
> >> > web but haven't found a solution that seems to fit. Any suggestion?
> >> 
> >> Due to Python's dynamic nature it is rarely necessary to generate Python
> >> code. What are you actually trying to achieve?
> > 
> > I'm trying to generate the script file that will launch a PythonCard
> > resource file.
> > 
> > very basic example from the documentation.
> > 
> > #!/usr/bin/python
> > """
> > __version__ = "$Revision: 1.10 $"
> > __date__ = "$Date: 2004年04月24日 22:13:31 $"
> > """
> > 
> > from PythonCard import model
> > 
> > class Minimal(model.Background):
> > pass
> > 
> > if __name__ == '__main__':
> > app = model.Application(Minimal)
> > app.MainLoop()
>> If it doesn't get too complex you could start with Python's built-in string 
> formatting:
>> import sys
>> template = '''\
> #!/usr/bin/python
> from PythonCard import model
>> class {Class}(model.Background):
> pass
>> if __name__ == '__main__':
> app = model.Application({Class})
> app.MainLoop()
> '''
>> resourcename, filename = sys.argv[1:]
>> with open(resourcename, "U") as f:
> data = eval(f.read())
>> with open(filename, "w") as f:
> f.write(template.format(Class=data["application"]["name"]))
>> If you need logic inside the template, here's on overview: 
>> http://wiki.python.org/moin/Templating
>> So there are rather too many options than too few.

It shouldn't get very complicated so I look through those options.
Thanks to all posters