Need to write python source with python
Peter Otten
__peter__ at web.de
Tue Feb 28 14:25:33 EST 2012
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: 2004/04/24 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.
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