Re: python to C code generator

[Steven D'Aprano]

On Tue, 23 Jan 2018 17:43:18 +, bartc wrote:

> It wouldn't be a satisfactory way of writing C programs. So, although
> I'm not that big a fan of C syntax, it might be better to write C as C,
> and Python as Python, to avoid confusion.)

This.

The fundamental reality is that `a + b` means different things in C and 
Python. Even if you limit yourself to integers and not arbitrary values 
(fractions, lists, strings, etc) the semantics are different:

- in C, ints have a fixed number of bits and any addition which
  ends up out of range is undefined behaviour[1];

- while Python uses BigInts, overflow is impossible, and the
  only possible error is that you run out of memory and an
  exception is raised (although the addition can take an 
  indefinite long amount of time).


Often the difference doesn't matter... but when it does matter, it 
*really* matters.




[1] If anyone thinks that it is addition with overflow, you are wrong. 
Some C compilers *may* use overflow, but the language strictly defines it 
as undefined behaviour, so the compiler can equally choose to set your 
computer on fire[2] if it prefers.

https://blog.regehr.org/archives/213



[2] http://www.catb.org/jargon/html/H/HCF.html


-- 
Steve

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Re: python to C code generator

[bartc]

On 23/01/2018 13:34, bartc wrote:
Perhaps you simply want to use Python syntax to write C code? That would  > be a different kind of translator. And a simpler one, as 'a=b+c' > 

translates to 'a+b+c;' in C.
Or rather, 'a=b+c;'

(I've written source to source translators, some of which could target 
C, but not Python to C.


It would be feasible to write C code in a syntax that looks rather like 
Python, but it won't be real Python, and you can't run it as Python.


It wouldn't be a satisfactory way of writing C programs. So, although 
I'm not that big a fan of C syntax, it might be better to write C as C, 
and Python as Python, to avoid confusion.)


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Re: python to C code generator

[Chris Angelico]

On Wed, Jan 24, 2018 at 1:45 AM,   wrote:
> Hey Ally,
>
> Cython adds a big chunk of complexity to simple things. That's the problem.

That's like saying "Unicode adds a big chunk of complexity to the
simple task of translating a word from Japanese into Russian". No, it
doesn't; the complexity is inherent in the problem. You cannot
translate Python code into C code without either (a) reimplementing
all of Python's semantics, as Cython does; or (b) drastically changing
the semantics, such that even the very simplest of code might behave
quite differently; or (c) manually reading through the code and
writing equivalent C, which is what you might call "porting" or
"rewriting". (Or possibly "prototyping", if the intention was always
to transform it into C.) There is fundamentally NO easy way to
translate code from one language into another and get readable,
idiomatic code at the other end.

ChrisA
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Re: python to C code generator

[theodore . leblanc]

Hey Ally,

Cython adds a big chunk of complexity to simple things. That's the problem.

Greetings.

On 01/23/2018 01:54 PM, ally.m...@bankmail.host wrote:

Have you tried cython ?

On 01/23/2018 01:25 PM, kushal bhattacharya wrote:
On Wednesday, January 17, 2018 at 4:34:23 PM UTC+5:30, kushal 
bhattacharya wrote:

Hi,
Is there any python framework or any tool as  which can generate C 
code from python code as it is .


Thanks,
Kushal


hi,
I have found nuitka as asuitable candidate but it seems that nuitka 
doesnt generate a simple C code which could be included as a C file in 
another program.Is there any alternative easier way regarding this?


Thanks


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Re: python to C code generator

[kushal bhattacharya]

On Wednesday, January 17, 2018 at 4:34:23 PM UTC+5:30, kushal bhattacharya 
wrote:
> Hi,
> Is there any python framework or any tool as  which can generate C code from 
> python code as it is .
> 
> Thanks,
> Kushal

ok so which python tool would be the best one which can be included and 
parameters can be passed to from another C code file
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Re: python to C code generator

[Andrew Z]

Id go this way too. Basic C is straightforward.  I usually consider
learning a new "thing " if the time to support potwntially combersome
solution using existing methods  justifies the effort.

On Jan 23, 2018 09:01, "Ned Batchelder"  wrote:

> On 1/23/18 8:48 AM, kushal bhattacharya wrote:
>
>> On Tuesday, January 23, 2018 at 7:05:02 PM UTC+5:30, bartc wrote:
>>
>>> On 23/01/2018 13:23, kushal bhattacharya wrote:
>>>
 On Wednesday, January 17, 2018 at 4:34:23 PM UTC+5:30, kushal
 bhattacharya wrote:

> Hi,
> Is there any python framework or any tool as  which can generate C
> code from python code as it is .
>
> Thanks,
> Kushal
>
 yes i have but it generates a complex C code with python dependencies.I
 want to call the generated function from another C code but i Cant figure
 out how to do that

>>> Because the translation isn't simply defined.
>>>
>>> I've just tried nuitka on the Python code 'a=b+c', and it generates 2400
>>> lines of C. The main purpose seems to be to generate a self-contained
>>> executable corresponding to the Python, but generating first a C
>>> equivalent then using a C compiler and linker.
>>>
>>> This equivalent code may just contain all the bits in CPython needed to
>>> do the job, but bypassing all the stuff to do with executing actual
>>> byte-code. But it also seems to do some optimisations (in the generated
>>> C before it uses C compiler optimisations), so that if static types can
>>> be inferred it might make use of that info.
>>>
>>> Perhaps you simply want to use Python syntax to write C code? That would
>>> be a different kind of translator. And a simpler one, as 'a=b+c'
>>> translates to 'a+b+c;' in C.
>>>
>>> --
>>> bartc
>>>
>>
>> This is exactly what i meant to say.My goal is to translate the python
>> code into its C equivalent with function name as it is.
>>
>
> The best way to do that is to read the Python code, understand what it
> does, and re-write it in C.  You won't find an automatic tool that can do
> the job you want.  The semantics of Python and C are too different.
>
> --Ned.
> --
> https://mail.python.org/mailman/listinfo/python-list
>
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Re: python to C code generator

[Kirill Balunov]

You can look at SymPy code generator
http://docs.sympy.org/latest/modules/utilities/codegen.html
Perhaps this is exactly what you need.

With kind regards,
-gdg

2018-01-23 17:00 GMT+03:00 Ned Batchelder :

> On 1/23/18 8:48 AM, kushal bhattacharya wrote:
>
>> On Tuesday, January 23, 2018 at 7:05:02 PM UTC+5:30, bartc wrote:
>>
>>> On 23/01/2018 13:23, kushal bhattacharya wrote:
>>>
 On Wednesday, January 17, 2018 at 4:34:23 PM UTC+5:30, kushal
 bhattacharya wrote:

> Hi,
> Is there any python framework or any tool as  which can generate C
> code from python code as it is .
>
> Thanks,
> Kushal
>
 yes i have but it generates a complex C code with python dependencies.I
 want to call the generated function from another C code but i Cant figure
 out how to do that

>>> Because the translation isn't simply defined.
>>>
>>> I've just tried nuitka on the Python code 'a=b+c', and it generates 2400
>>> lines of C. The main purpose seems to be to generate a self-contained
>>> executable corresponding to the Python, but generating first a C
>>> equivalent then using a C compiler and linker.
>>>
>>> This equivalent code may just contain all the bits in CPython needed to
>>> do the job, but bypassing all the stuff to do with executing actual
>>> byte-code. But it also seems to do some optimisations (in the generated
>>> C before it uses C compiler optimisations), so that if static types can
>>> be inferred it might make use of that info.
>>>
>>> Perhaps you simply want to use Python syntax to write C code? That would
>>> be a different kind of translator. And a simpler one, as 'a=b+c'
>>> translates to 'a+b+c;' in C.
>>>
>>> --
>>> bartc
>>>
>>
>> This is exactly what i meant to say.My goal is to translate the python
>> code into its C equivalent with function name as it is.
>>
>
> The best way to do that is to read the Python code, understand what it
> does, and re-write it in C.  You won't find an automatic tool that can do
> the job you want.  The semantics of Python and C are too different.
>
> --Ned.
> --
> https://mail.python.org/mailman/listinfo/python-list
>
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Re: python to C code generator

[Ned Batchelder]

On 1/23/18 8:48 AM, kushal bhattacharya wrote:

On Tuesday, January 23, 2018 at 7:05:02 PM UTC+5:30, bartc wrote:

On 23/01/2018 13:23, kushal bhattacharya wrote:

On Wednesday, January 17, 2018 at 4:34:23 PM UTC+5:30, kushal bhattacharya 
wrote:

Hi,
Is there any python framework or any tool as  which can generate C code from 
python code as it is .

Thanks,
Kushal

yes i have but it generates a complex C code with python dependencies.I want to 
call the generated function from another C code but i Cant figure out how to do 
that

Because the translation isn't simply defined.

I've just tried nuitka on the Python code 'a=b+c', and it generates 2400
lines of C. The main purpose seems to be to generate a self-contained
executable corresponding to the Python, but generating first a C
equivalent then using a C compiler and linker.

This equivalent code may just contain all the bits in CPython needed to
do the job, but bypassing all the stuff to do with executing actual
byte-code. But it also seems to do some optimisations (in the generated
C before it uses C compiler optimisations), so that if static types can
be inferred it might make use of that info.

Perhaps you simply want to use Python syntax to write C code? That would
be a different kind of translator. And a simpler one, as 'a=b+c'
translates to 'a+b+c;' in C.

--
bartc


This is exactly what i meant to say.My goal is to translate the python code 
into its C equivalent with function name as it is.


The best way to do that is to read the Python code, understand what it 
does, and re-write it in C.  You won't find an automatic tool that can 
do the job you want.  The semantics of Python and C are too different.


--Ned.
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Re: python to C code generator

[kushal bhattacharya]

On Tuesday, January 23, 2018 at 7:05:02 PM UTC+5:30, bartc wrote:
> On 23/01/2018 13:23, kushal bhattacharya wrote:
> > On Wednesday, January 17, 2018 at 4:34:23 PM UTC+5:30, kushal bhattacharya 
> > wrote:
> >> Hi,
> >> Is there any python framework or any tool as  which can generate C code 
> >> from python code as it is .
> >>
> >> Thanks,
> >> Kushal
> > 
> > yes i have but it generates a complex C code with python dependencies.I 
> > want to call the generated function from another C code but i Cant figure 
> > out how to do that
> 
> Because the translation isn't simply defined.
> 
> I've just tried nuitka on the Python code 'a=b+c', and it generates 2400 
> lines of C. The main purpose seems to be to generate a self-contained 
> executable corresponding to the Python, but generating first a C 
> equivalent then using a C compiler and linker.
> 
> This equivalent code may just contain all the bits in CPython needed to 
> do the job, but bypassing all the stuff to do with executing actual 
> byte-code. But it also seems to do some optimisations (in the generated 
> C before it uses C compiler optimisations), so that if static types can 
> be inferred it might make use of that info.
> 
> Perhaps you simply want to use Python syntax to write C code? That would 
> be a different kind of translator. And a simpler one, as 'a=b+c' 
> translates to 'a+b+c;' in C.
> 
> -- 
> bartc


This is exactly what i meant to say.My goal is to translate the python code 
into its C equivalent with function name as it is.
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Re: python to C code generator

[bartc]

On 23/01/2018 13:23, kushal bhattacharya wrote:

On Wednesday, January 17, 2018 at 4:34:23 PM UTC+5:30, kushal bhattacharya 
wrote:

Hi,
Is there any python framework or any tool as  which can generate C code from 
python code as it is .

Thanks,
Kushal


yes i have but it generates a complex C code with python dependencies.I want to 
call the generated function from another C code but i Cant figure out how to do 
that


Because the translation isn't simply defined.

I've just tried nuitka on the Python code 'a=b+c', and it generates 2400 
lines of C. The main purpose seems to be to generate a self-contained 
executable corresponding to the Python, but generating first a C 
equivalent then using a C compiler and linker.


This equivalent code may just contain all the bits in CPython needed to 
do the job, but bypassing all the stuff to do with executing actual 
byte-code. But it also seems to do some optimisations (in the generated 
C before it uses C compiler optimisations), so that if static types can 
be inferred it might make use of that info.


Perhaps you simply want to use Python syntax to write C code? That would 
be a different kind of translator. And a simpler one, as 'a=b+c' 
translates to 'a+b+c;' in C.


--
bartc

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Re: python to C code generator

[kushal bhattacharya]

On Wednesday, January 17, 2018 at 4:34:23 PM UTC+5:30, kushal bhattacharya 
wrote:
> Hi,
> Is there any python framework or any tool as  which can generate C code from 
> python code as it is .
> 
> Thanks,
> Kushal

yes i have but it generates a complex C code with python dependencies.I want to 
call the generated function from another C code but i Cant figure out how to do 
that
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Re: python to C code generator

[paulina . zuniga]

What about Cython?

On 01/23/2018 01:25 PM, kushal bhattacharya wrote:

On Wednesday, January 17, 2018 at 4:34:23 PM UTC+5:30, kushal bhattacharya 
wrote:

Hi,
Is there any python framework or any tool as  which can generate C code from 
python code as it is .

Thanks,
Kushal


hi,
I have found nuitka as asuitable candidate but it seems that nuitka doesnt 
generate a simple C code which could be included as a C file in another 
program.Is there any alternative easier way regarding this?

Thanks


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Re: python to C code generator

[kushal bhattacharya]

On Wednesday, January 17, 2018 at 4:34:23 PM UTC+5:30, kushal bhattacharya 
wrote:
> Hi,
> Is there any python framework or any tool as  which can generate C code from 
> python code as it is .
> 
> Thanks,
> Kushal

hi,
I have found nuitka as asuitable candidate but it seems that nuitka doesnt 
generate a simple C code which could be included as a C file in another 
program.Is there any alternative easier way regarding this?

Thanks
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Re: python to C code generator

[bartc]

On 17/01/2018 11:04, kushal bhattacharya wrote:

Hi,
Is there any python framework or any tool as  which can generate C code from 
python code as it is .


What C code would you expect to see from this line of Python:

   a = b + c

?

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Re: python to C code generator

[David Palao]

Hi,
Have a look at Cython.

Best

2018-01-17 12:04 GMT+01:00 kushal bhattacharya :
> Hi,
> Is there any python framework or any tool as  which can generate C code from 
> python code as it is .
>
> Thanks,
> Kushal
> --
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python to C code generator

[kushal bhattacharya]

Hi,
Is there any python framework or any tool as  which can generate C code from 
python code as it is .

Thanks,
Kushal
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