[Chicken-users] Chicken for python
Hello all, first time post here. I decided to give lisp et al. a go and started to dive into functional programming. Since I come from a Python background, I wonder if there is a chance that one could extend Python with the use of a library compiled by Chicken. CHICKEN produces portable and efficient C, so maybe there is a way to feed some chickens to the snake? For the record, I posted the question at stackoverflow: http://stackoverflow.com/questions/19849048/chicken-for-python-extending-python-with-the-use-of-a-shared-library Any opinions, ideas, comments? Cheers! ___ Chicken-users mailing list Chicken-users@nongnu.org https://lists.nongnu.org/mailman/listinfo/chicken-users
Re: [Chicken-users] Chicken for python
You'd likely just have to wrap the C functions that exist for embedding Chicken in other apps. http://wiki.call-cc.org/embedding http://wiki.call-cc.org/man/4/Embedding -Dan On Fri, Nov 8, 2013 at 3:54 PM, m...@freeshell.de wrote: Hello all, first time post here. I decided to give lisp et al. a go and started to dive into functional programming. Since I come from a Python background, I wonder if there is a chance that one could extend Python with the use of a library compiled by Chicken. CHICKEN produces portable and efficient C, so maybe there is a way to feed some chickens to the snake? For the record, I posted the question at stackoverflow: http://stackoverflow.com/questions/19849048/chicken-for-python-extending-python-with-the-use-of-a-shared-library Any opinions, ideas, comments? Cheers! ___ Chicken-users mailing list Chicken-users@nongnu.org https://lists.nongnu.org/mailman/listinfo/chicken-users ___ Chicken-users mailing list Chicken-users@nongnu.org https://lists.nongnu.org/mailman/listinfo/chicken-users
[Chicken-users] Chicken for python
Hello all, I am fairly new to the world of lisp, and yet I am hacking a bit here and there to get a better idea of functional programming et al. I recently posted a question to stackoverflow that might be of interest to the chicken people and python people as well, and I thought that it might be a good idea to bring it up on this list as well: http://stackoverflow.com/questions/19849048/chicken-for-python-extending-python-with-the-use-of-a-shared-library The question was whether chicken scheme could be use to create libraries for python, as chicken is able to produce solid C code. Cheers, Piotr ___ Chicken-users mailing list Chicken-users@nongnu.org https://lists.nongnu.org/mailman/listinfo/chicken-users
Re: [Chicken-users] Chicken for python
Hi Dan, On Fri, Nov 08, 2013 at 03:58:26PM -0800, Daniel Leslie wrote: You'd likely just have to wrap the C functions that exist for embedding Chicken in other apps. http://wiki.call-cc.org/embedding http://wiki.call-cc.org/man/4/Embedding I shall try this out. Thanks! - piotr ___ Chicken-users mailing list Chicken-users@nongnu.org https://lists.nongnu.org/mailman/listinfo/chicken-users
Re: [Chicken-users] Chicken for python
Hello, There was a similar attempt a couple of years ago, and the results were posted here: http://lists.gnu.org/archive/html/chicken-users/2011-01/msg00179.html This is about embedding a Chicken REPL inside Python, which a little bit different than what you want, but it might be helpful. -Ivan On Sat, Nov 9, 2013 at 8:54 AM, m...@freeshell.de wrote: Hello all, first time post here. I decided to give lisp et al. a go and started to dive into functional programming. Since I come from a Python background, I wonder if there is a chance that one could extend Python with the use of a library compiled by Chicken. CHICKEN produces portable and efficient C, so maybe there is a way to feed some chickens to the snake? For the record, I posted the question at stackoverflow: http://stackoverflow.com/questions/19849048/chicken-for-python-extending-python-with-the-use-of-a-shared-library Any opinions, ideas, comments? Cheers! ___ Chicken-users mailing list Chicken-users@nongnu.org https://lists.nongnu.org/mailman/listinfo/chicken-users ___ Chicken-users mailing list Chicken-users@nongnu.org https://lists.nongnu.org/mailman/listinfo/chicken-users
Re: [Chicken-users] Chicken for Python Programmers
John Cowan wrote: In Scheme all functions are lambdas: but they don't have the restrictions of Python lambdas. Maybe one could say: In Scheme all functions are lambdas and all lambdas are functions. They have the power of regular Python functions and the usefulness of Python lambdas, at the same time. SRFI-1 provides append!, but note that you must capture the return values of destructive (!) list functions; you can't just rely on the side effects. There is no guarantee that append! will actually side- effect its arguments; you are just permitting it to do so. Here I would add a generic explanation on the conceptual difference between Python's and Scheme's destructive operations, more than a list of behaviours. Let's see if I can come up with something: A Python list is a single object. Its destructive or in-place operations (such as sort or append) simply operate on the whole object and modify it in-place. Scheme values that are also single objects (such as strings, pairs, or hash tables) behave in the same way. A Scheme list, on the other hand, is a chain of simpler objects (pairs) so you typically don't have operations that modify the whole list in-place. Both Scheme's destructive and non-destructive list operations return a new list with the requested changes. This new list (the return value of the operation) will have to be used somewhere to be of use, even if just by re-assigning it to the same variable: (set! some-list (reverse! some-list)) ;same as: some_list.reverse() The difference between non-destructive and destructive operations is that the destructive sort may build the new list by recycling the pairs that make up the old chain. A destructive operation is often more optimized, but you should only use it when: 1. you are reassigning the return value to the same variable, see above, or 2. you won't use that variable anymore, after the operation. This strange paradigm comes from Scheme's emphasis on functional programming. A Scheme programmer doesn't expect a variable (such as some-list above) to change its immediate, direct value, unless he explicitly set!s it to a new value. The functional programming style completely avoids set!, or variable assignment, and that is why this paradigm makes sense. -Tobia ___ Chicken-users mailing list Chicken-users@nongnu.org http://lists.nongnu.org/mailman/listinfo/chicken-users
Re: [Chicken-users] Chicken for Python Programmers
Jack Trades scripsit: After noticing Chicken for blub programmers on the wiki some months ago, I decided a good way to learn Scheme would be to produce a similar document. Great work! Just a few notes: Altering a character in a *literal* string is never a good idea in any language; if you must demonstrate string-set!, use one constructed with the make-string or string procedures. Some Schemes disallow string-set! if they know the string is literal. In Scheme all functions are lambdas: but they don't have the restrictions of Python lambdas. Nested functions: note that Scheme can do internal defines. Unfortunately, hash tables in Chicken aren't very efficient yet: in small examples, a-lists are better. SRFI-1 provides append!, but note that you must capture the return values of destructive (!) list functions; you can't just rely on the side effects. There is no guarantee that append! will actually side-effect its arguments; you are just permitting it to do so. One way to do a LIST-SET! operation is: (define (list-set! list index new) (set-car! (drop list index) new)) This works because the result of drop is guaranteed to share storage with the original list. Similarly, list-insert! is: (define (list-insert! list index new) (append (take list index) (list new) (drop list index))) To reverse in place when possible, use reverse!, but note that you must capture the result: (set! r (reverse! r)) Ditto with sort!. List-copy makes a shallow copy of a list. Here's a tree-copy function: (define (tree-copy x) (if (pair? x) (cons (tree-copy (car x)) (tree-copy (cdr x))) x)) -- Deshil Holles eamus. Deshil Holles eamus. Deshil Holles eamus. Send us, bright one, light one, Horhorn, quickening, and wombfruit. (3x) Hoopsa, boyaboy, hoopsa! Hoopsa, boyaboy, hoopsa! Hoopsa, boyaboy, hoopsa! --Joyce, Ulysses, Oxen of the Sun co...@ccil.org ___ Chicken-users mailing list Chicken-users@nongnu.org http://lists.nongnu.org/mailman/listinfo/chicken-users
Re: [Chicken-users] Chicken for Python Programmers
On Tue, Dec 30, 2008 at 1:21 AM, Jack Trades jacktradespub...@gmail.com wrote: After noticing Chicken for blub programmers on the wiki some months ago, I decided a good way to learn Scheme would be to produce a similar document. It's ~50 pages long and written as one large table with various sub-headings. At last count (end of November), it had over 400 solutions to about 250 problems in both Chicken and Python, as well as tons of links to further documentation and reference material. It's currently still in draft form, which means there's some editing notes and blank sections here and there. I plan to continue working on the document, but I've been sidetracked developing a DSL for an evolutionary programming language, which I also plan to document in this format. If you'd like to comment or contribute I'd be appreciative and would eventually be willing to translate it to wiki format if there is an interest. This is excellent, Jack! I'm sure this would be extremely interesting to Scheme/Chicken newcomers. If you could convert it to wiki-syntax, we would be more than happy to add it to the wiki. cheers, felix ___ Chicken-users mailing list Chicken-users@nongnu.org http://lists.nongnu.org/mailman/listinfo/chicken-users
Re: [Chicken-users] Chicken for Python Programmers
On Tue, Dec 30, 2008 at 02:01:48PM +0100, felix winkelmann wrote: I plan to continue working on the document, but I've been sidetracked developing a DSL for an evolutionary programming language, which I also plan to document in this format. If you'd like to comment or contribute I'd be appreciative and would eventually be willing to translate it to wiki format if there is an interest. This is excellent, Jack! I'm sure this would be extremely interesting to Scheme/Chicken newcomers. If you could convert it to wiki-syntax, we would be more than happy to add it to the wiki. +1 Great stuff. Cheers, Peter -- http://sjamaan.ath.cx -- The process of preparing programs for a digital computer is especially attractive, not only because it can be economically and scientifically rewarding, but also because it can be an aesthetic experience much like composing poetry or music. -- Donald Knuth pgpWshyEQzSio.pgp Description: PGP signature ___ Chicken-users mailing list Chicken-users@nongnu.org http://lists.nongnu.org/mailman/listinfo/chicken-users
[Chicken-users] Chicken for Python Programmers
After noticing Chicken for blub programmers on the wiki some months ago, I decided a good way to learn Scheme would be to produce a similar document. It's ~50 pages long and written as one large table with various sub-headings. At last count (end of November), it had over 400 solutions to about 250 problems in both Chicken and Python, as well as tons of links to further documentation and reference material. It's currently still in draft form, which means there's some editing notes and blank sections here and there. I plan to continue working on the document, but I've been sidetracked developing a DSL for an evolutionary programming language, which I also plan to document in this format. If you'd like to comment or contribute I'd be appreciative and would eventually be willing to translate it to wiki format if there is an interest. Unfortunately I used this document as a test of Google Docs, and under all but the most ideal circumstances the formatting sucks. Nevertheless you can find the raw Google Docs version at the address below. If you like it, hate it or would like to see additions please comment. http://docs.google.com/Doc?id=dgxzmhv_579j3m5kc5 Jack Trades ___ Chicken-users mailing list Chicken-users@nongnu.org http://lists.nongnu.org/mailman/listinfo/chicken-users
Re: [Chicken-users] Chicken for Python Programmers
On Monday 29 December 2008 05:21:21 pm Jack Trades wrote: After noticing Chicken for blub programmers on the wiki some months ago, I decided a good way to learn Scheme would be to produce a similar document. It's ~50 pages long and written as one large table with various sub-headings. At last count (end of November), it had over 400 solutions to about 250 problems in both Chicken and Python, as well as tons of links to further documentation and reference material. It's currently still in draft form, which means there's some editing notes and blank sections here and there. I plan to continue working on the document, but I've been sidetracked developing a DSL for an evolutionary programming language, which I also plan to document in this format. If you'd like to comment or contribute I'd be appreciative and would eventually be willing to translate it to wiki format if there is an interest. Unfortunately I used this document as a test of Google Docs, and under all but the most ideal circumstances the formatting sucks. Nevertheless you can find the raw Google Docs version at the address below. If you like it, hate it or would like to see additions please comment. http://docs.google.com/Doc?id=dgxzmhv_579j3m5kc5 Jack, I think your doc is potentially really useful for beginners. I haven't read the whole thing but did notice the following: Construction of a Populated Dictionary Chicken: I'm sure there's a standard way to do this, but did not find it in a quick search. AFAIK there is no readable representation of a hash table. The closest you can get is by using an alist: csi (hash-table-ref (alist-hash-table '( (a . 1)(b . 2))) a) 1 I'd like to see a yaml reader/writer egg but haven't had time to tackle it myself. Matt -=- ___ Chicken-users mailing list Chicken-users@nongnu.org http://lists.nongnu.org/mailman/listinfo/chicken-users
