Need to write python source with python

[crstop]

Hi All,

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? 
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Re: Need to write python source with python

[crstop]

On Tuesday, February 28, 2012 9:56:43 AM UTC-8, Peter Otten wrote:
> crs...@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: 2004/04/24 22:13:31 $"
"""

from PythonCard import model

class Minimal(model.Background):
pass

if __name__ == '__main__':
app = model.Application(Minimal)
app.MainLoop() 
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Re: Need to write python source with python

[crstop]

On Tuesday, February 28, 2012 11:25:33 AM UTC-8, Peter Otten wrote:
> crs...@gmail.com wrote:
> 
> > On Tuesday, February 28, 2012 9:56:43 AM UTC-8, Peter Otten wrote:
> >> crs...@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: 2004/04/24 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

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