qPython 1.1 dev fails for synchronous function with parameter:

[beebeed]

Running qPython 1.1 dev fails when running

print q.sync('{til x}', 10)

it generates the following error

print(q.sync('{til x}', 10))
File "C:\Python3403_64\lib\site-packages\qpython\qconnection.py", line 268, in sync
    response = self.receive(data_only = False, **options)
File "C:\Python3403_64\lib\site-packages\qpython\qconnection.py", line 341, in receive
    result = self._reader.read(**self._options.union_dict(**options))
File "C:\Python3403_64\lib\site-packages\qpython\qreader.py", line 151, in read
    message.data = self.read_data(message.size, message.is_compressed, **options)
File "C:\Python3403_64\lib\site-packages\qpython\qreader.py", line 228, in read_data
    return raw_data if options.raw else self._read_object(options)
File "C:\Python3403_64\lib\site-packages\qpython\qreader.py", line 237, in _read_object
    return reader(self, qtype, options)
File "C:\Python3403_64\lib\site-packages\qpython\qreader.py", line 248, in _read_error
    raise QException(self._read_symbol(options = options))
qpython.qtype.QException: b'type'

Environment: Windows 7 64 bit, Python 3.4, qpython 1.1 dev

This query works for Python 2.7, qpython 1.0

Kind regard

David Bieber

[maciejlach]

Could you please provide us with additional details on Python and numpy version in your setup?

I failed to reproduce the issue in my Python 3.4 environment:

Python 3.4.2 (v3.4.2:ab2c023a9432, Oct  6 2014, 22:16:31) [MSC v.1600 64 bit (AMD64)] on win32

OS Name:                   Microsoft Windows 8.1 Pro
OS Version:                6.3.9600 N/A Build 9600

Numpy (installed with pip from Unofficial Windows Binaries for Python Extension Packages):

numpy-1.9.2+mkl-cp34-none-win_amd64

Code has been executed against kdb+ versions:

w32/ KDB+ 3.1 2014.07.01 Copyright (C) 1993-2014 Kx Systems
l64/ KDB+ 3.2 2014.08.22 Copyright (C) 1993-2014 Kx Systems

Reported error indicates that the function parameter 10 has been serialized into IPC protocol as a non-integer value.

[beebeed]

Thanks for looking into this for me

I am using

Python 3.4.3 (v3.4.3:9b73f1c3e601, Feb 24 2015, 22:44:40) [MSC v.1600 64 bit (AMD64)] on win32
OS Name: Microsoft Windows 7 Pro
OS Version: Version 6.1.7601

Numpy (also installed with pip from Unofficial Windows Binaries for Python Extension Packages):

numpy-1.9.2+mkl-cp34-none-win_amd64

The code was excuted against an older version of 64 bit KDB

w64/ KDB+ 2.7 2011.11.18 Copyright (C) 1993-2011 Kx Systems

Kind regards

David

[beebeed]

FYI ...

I just tried the trial version of kdb+ w32/ KDB+ 3.3 2015.07.09 and it works.

[maciejlach]

To summarize all the findings:

• in Python3 integer literals are represented as long and thus serialized to kdb+ long,
• kdb+ 2.7 expects til function argument to be 32 bit integer,
• the type error is thrown (while using Python 3) as argument to the call is 64 bit integer.

You can force the qpython to serialize this parameter to 32 bit with following syntax:

print(q.sync('{til x}', numpy.int32(10)))

[beebeed]

Thanks Maciej,

That now works with kdb 2.7+

Regards

David