Code Generator written in python

nyoka

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Jan 13, 2010, 10:48:26 AM1/13/10

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Can someone help me with sample python code for a code generator

Stefan Behnel

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Jan 13, 2010, 10:52:52 AM1/13/10

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nyoka, 13.01.2010 16:48:

> Can someone help me with sample python code for a code generator

Such as Cheetah?

http://www.cheetahtemplate.org/

BTW, you might want to be more specific about your problem at hand. Code
generation is a rarely used technique in Python. Most of the time, it's
more maintainable (and not necessarily harder or more work) to actually
write the code by hand.

Stefan

Peter Otten

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Jan 13, 2010, 10:56:13 AM1/13/10

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nyoka wrote:

> Can someone help me with sample python code for a code generator

>>> print "print"
print

Seriously, you have to provide more information if you want a meaningful
answer. If the generated code is Python, too, then the advice is most likely
that you don't need to generate any code at all.

Peter

Arnaud Delobelle

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Jan 13, 2010, 11:09:38 AM1/13/10

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nyoka <dansh...@gmail.com> writes:

> Can someone help me with sample python code for a code generator

Sure, here are some example of self-evaluating python objects, i.e. for each v
below,

v == eval(v)

I'm quite proud of the last one.

v = (lambda x:x%('"''""'+x+'"''""'))("""(lambda x:x%%('"''""'+x+'"''""'))(%s)""")

v = (lambda x:x%('r\"'+x+'\"'))(r"(lambda x:x%%('r\"'+x+'\"'))(%s)")

v = (lambda x:x%`x`)('(lambda x:x%%`x`)(%s)')

v = (lambda x: x+"("+`x`+")")('(lambda x: x+"("+`x`+")")')

v = "\"%s\" %% ((r\"%s\",)*2)" % ((r"\"%s\" %% ((r\"%s\",)*2)",)*2)

:)

--
Arnaud

Gabriel Genellina

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Jan 13, 2010, 11:26:01 AM1/13/10

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En Wed, 13 Jan 2010 13:09:38 -0300, Arnaud Delobelle
<arn...@googlemail.com> escribiï¿œ:

> nyoka <dansh...@gmail.com> writes:
>
>> Can someone help me with sample python code for a code generator
>
> Sure, here are some example of self-evaluating python objects, i.e. for
> each v
> below,
>
> v == eval(v)
>
> I'm quite proud of the last one.

And I'm still trying to disembowel it! :)

> v = (lambda x:x%('"''""'+x+'"''""'))("""(lambda
> x:x%%('"''""'+x+'"''""'))(%s)""")
>
> v = (lambda x:x%('r\"'+x+'\"'))(r"(lambda x:x%%('r\"'+x+'\"'))(%s)")
>
> v = (lambda x:x%`x`)('(lambda x:x%%`x`)(%s)')
>
> v = (lambda x: x+"("+`x`+")")('(lambda x: x+"("+`x`+")")')
>
> v = "\"%s\" %% ((r\"%s\",)*2)" % ((r"\"%s\" %% ((r\"%s\",)*2)",)*2)

--
Gabriel Genellina

Steve Ferg

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Jan 13, 2010, 3:58:06 PM1/13/10

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http://nedbatchelder.com/code/cog/

trzewiczek

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Jan 14, 2010, 6:57:31 AM1/14/10

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If you're proud of the last one, consider moving to Perl. Python is - as
I heard - about elegance and readability of code...

Arnaud Delobelle

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Jan 14, 2010, 11:51:25 AM1/14/10

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trzewiczek <trzew...@trzewiczek.info> writes:

> On 01/13/2010 05:09 PM, Arnaud Delobelle wrote:

[...]

>> Sure, here are some example of self-evaluating python objects,
>> i.e. for each v below,
>>
>> v == eval(v)
>>
>> I'm quite proud of the last one.

[...]

>> v = "\"%s\" %% ((r\"%s\",)*2)" % ((r"\"%s\" %% ((r\"%s\",)*2)",)*2)
>>
>> :)
>>
>>
> If you're proud of the last one, consider moving to Perl. Python is -
> as I heard - about elegance and readability of code...

No thanks. It's far too easy to write unreadable code in Perl and I
like a challenge :)

Seriously - this is a self-evaluating string, not code for landing a
$1bn rocket on Mars. Do you expect it to be readable? I don't.
However, I definitely find a certain elegance to it.

--
Arnaud