Writing Lists in Python?

[John Meehan]

Can Lists be written in Python?

What would be the Python equivalent of this example from the CouchDB
wiki (http://wiki.apache.org/couchdb/Formatting_with_Show_and_List)?

function(head, req) {
var row;
start({
"headers": {
"Content-Type": "text/html"
}
});
while(row = getRow()) {
send(row.value);
}
}

[Kxepal]

Hi!

Currently this could be done by using new query server from issue 146 (http://code.google.com/p/couchdb-python/issues/detail?id=146)

Equivalent would be :

def fun(head, req):

  start({

    "headers": {"Content-Type": "text/html"}

  })

  for row in get_row():

    send(row["value"])

Notice, that get_row function is generator and any dotted notation accessed attributes should be changed to getitem specification due to this is dict object.

Also notice, that builtn query server function are respect PEP-8, so there is nothing mixedCased nor CamelCase except exceptions(Forbidden, Error, FatalError).

If you would try this query server any feedback would be great(:

--

,,,^..^,,,

[John Meehan]

Thanks!  My next question, however, is how do I install the updated files?

I downloaded query-server.tar.gz from your May 9th post in the issue 146 thread.  

I'm running Ubuntu 10.04, and installed couchdb-python originally with easy-install.  So I have the following in my /usr/local/lib/python2.6/dist-packages/CouchDB-0.8-py2.6.egg/couchdb dir:

-rwxr-xr-x 1 root staff 37477 2011-06-01 09:58 client.py

-rw-r--r-- 1 root staff 45267 2011-06-01 09:58 client.pyc

-rwxr-xr-x 1 root staff  7649 2011-06-01 09:58 design.py

-rw-r--r-- 1 root staff  8355 2011-06-01 09:58 design.pyc

-rwxr-xr-x 1 root staff 17607 2011-06-01 09:58 http.py

-rw-r--r-- 1 root staff 20156 2011-06-01 09:58 http.pyc

-rwxr-xr-x 1 root staff   534 2011-06-01 09:58 __init__.py

-rw-r--r-- 1 root staff   687 2011-06-01 09:58 __init__.pyc

-rwxr-xr-x 1 root staff  4441 2011-06-01 09:58 json.py

-rw-r--r-- 1 root staff  5859 2011-06-01 09:58 json.pyc

-rwxr-xr-x 1 root staff 22337 2011-06-01 09:58 mapping.py

-rw-r--r-- 1 root staff 34371 2011-06-01 09:58 mapping.pyc

-rwxr-xr-x 1 root staff  8640 2011-06-01 09:58 multipart.py

-rw-r--r-- 1 root staff  9080 2011-06-01 09:58 multipart.pyc

drwxr-sr-x 2 root staff  4096 2011-06-01 09:58 tests

drwxr-sr-x 2 root staff  4096 2011-06-01 09:58 tools

-rwxr-xr-x 1 root staff  7167 2011-06-01 09:58 view.py

-rw-r--r-- 1 root staff  7498 2011-06-01 09:58 view.pyc

(I'm assuming I need to overwrite or add the new files from the archive here.)

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[Kxepal]

Just extract couchdb folder from archive over couchdb installed package: where should be added server folder and replaced view.py by new one.

Next thing you have to do is specify version of CouchDB against that query server will be runned (supported since 0.9 till 1.1.0).

This could be done by edition [query_server] config option to made it looks like this (for 1.1.0 version):

python=/path/to/couchpy --couchdb-version=1.1.0 

And it should work(: For more information you may build sphinx docs - there have described all command line options, objects and usage examples.

[John Meehan]

Hi,

Not sure if I've done something wrong with my list code or if I'm running into an issue with the new view server.  The views I'd written worked as expected so I take it that the new view server files were installed OK, but now trying to write a test list against one of those views seems to encounter an issue compiling the list code.  This looks like the relevant portion of the view server log.  Any thoughts?

[2011-06-30 15:17:18,362] [couchdb.server.ddoc] [DEBUG] Processing DDoc command `lists`

[2011-06-30 15:17:18,362] [couchdb.server.compiler] [DEBUG] Compiling code to function:

def fun(head, req):

start({"headers": {"Content-Type": "text/html"}})

c = 0

for row in get_row():

send(str(c) + row['key'][0])

                c+=1

[2011-06-30 15:17:18,363] [couchdb.server.compiler] [ERROR] Failed to compile function

def fun(head, req):

start({"headers": {"Content-Type": "text/html"}})

c = 0

for row in get_row():

send(str(c) + row['key'][0])

                c+=1

Traceback (most recent call last):

  File "/usr/local/lib/python2.6/dist-packages/CouchDB-0.8-py2.6.egg/couchdb/server/compiler.py", line 284, in compile_func

    bytecode = compile(funstr, '<string>', 'exec')

  File "<string>", line 1

     def fun(head, req):

                       

^

 SyntaxError: invalid syntax

[2011-06-30 15:17:18,363] [couchdb.server] [ERROR] Error `compilation_error` occurred: invalid syntax (<string>, line 1)

Traceback (most recent call last):

  File "/usr/local/lib/python2.6/dist-packages/CouchDB-0.8-py2.6.egg/couchdb/server/__init__.py", line 253, in run

    retval = self.commands[cmd](*args)

  File "/usr/local/lib/python2.6/dist-packages/CouchDB-0.8-py2.6.egg/couchdb/server/ddoc.py", line 83, in ddoc

    func = compile_func(func, ddoc)

  File "/usr/local/lib/python2.6/dist-packages/CouchDB-0.8-py2.6.egg/couchdb/server/compiler.py", line 288, in compile_func

    raise Error('compilation_error', err)

Error: ('compilation_error', SyntaxError('invalid syntax', ('<string>', 1, 20, 'def fun(head, req):\r\n')))

[2011-06-30 15:17:18,363] [couchdb.server.stream] [DEBUG] Data to respond:

['error', 'compilation_error', SyntaxError('invalid syntax', ('<string>', 1, 20, 'def fun(head, req):\r\n'))]

[2011-06-30 15:17:18,363] [couchdb.server] [ERROR] TypeError: SyntaxError('invalid syntax', ('<string>', 1, 20, 'def fun(head, req):\r\n')) is not JSON serializable

Traceback (most recent call last):

  File "/usr/local/lib/python2.6/dist-packages/CouchDB-0.8-py2.6.egg/couchdb/server/__init__.py", line 255, in run

    retval = self.error_handler(*sys.exc_info())

  File "/usr/local/lib/python2.6/dist-packages/CouchDB-0.8-py2.6.egg/couchdb/server/__init__.py", line 233, in error_handler

    return self.error_handlers.get(type, default)(type, value, traceback)

  File "/usr/local/lib/python2.6/dist-packages/CouchDB-0.8-py2.6.egg/couchdb/server/__init__.py", line 176, in handle_qs_error

    stream.respond(retval)

  File "/usr/local/lib/python2.6/dist-packages/CouchDB-0.8-py2.6.egg/couchdb/server/stream.py", line 43, in respond

    obj = json.encode(obj)

  File "/usr/local/lib/python2.6/dist-packages/CouchDB-0.8-py2.6.egg/couchdb/json.py", line 65, in encode

    return _encode(obj)

  File "/usr/local/lib/python2.6/dist-packages/CouchDB-0.8-py2.6.egg/couchdb/json.py", line 113, in <lambda>

    dumps(obj, allow_nan=False, ensure_ascii=False)

  File "/usr/lib/pymodules/python2.6/simplejson/__init__.py", line 237, in dumps

    **kw).encode(obj)

  File "/usr/lib/pymodules/python2.6/simplejson/encoder.py", line 200, in encode

    chunks = self.iterencode(o, _one_shot=True)

  File "/usr/lib/pymodules/python2.6/simplejson/encoder.py", line 260, in iterencode

    return _iterencode(o, 0)

  File "/usr/lib/pymodules/python2.6/simplejson/encoder.py", line 177, in default

    raise TypeError(repr(o) + " is not JSON serializable")

TypeError: SyntaxError('invalid syntax', ('<string>', 1, 20, 'def fun(head, req):\r\n')) is not JSON serializable

[2011-06-30 15:17:18,380] [couchdb.server.stream] [DEBUG] Data to respond:

['error', 'TypeError', "SyntaxError('invalid syntax', ('<string>', 1, 20, 'def fun(head, req):\\r\\n')) is not JSON serializable"]

To view this discussion on the web visit https://groups.google.com/d/msg/couchdb-python/-/sFKh8Qt6PhYJ.

[Kxepal]

Wow. Looks like just SyntaxError, but it shouldn't have to produce double fail. Ok, I'll look why it happened.

Problem is that Python < 2.7 doesn't allows Windows/Mac style newlines within compile function (\r\n chars) [1]. That's my fault especially because I'm using Linux on my dev notebook and I even didn't know about such behavior(: Shortest workaround is to replace all \r\n chars to \n in function source code. I'll attach fixed version on this weekends due to I'm currently rewriting test methods from functional to pure unit tests.

Thanks for report!(:

[1] http://docs.python.org/library/functions.html#compile

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[John Meehan]

Ah yes.  That's what I get for editing from my Windows box.  I stripped the carriage returns and looks like it's working!  Thanks very much for your help.

To view this discussion on the web visit https://groups.google.com/d/msg/couchdb-python/-/kpeiuvjMCp8J.