This question is pretty much directed at @Maciej Lach but if anyone else has experienced this issue please let me know.
The issue is simple - qpyhton crashes (when pandas is set to true) whenever kdb sends it a single row table where one of the columns has a blank char.
I'm using: python version 2.7.11, qpython version qPython-1.2.0, pandas-0.18.1
To reproduce:
from qpython import qconnection
q = qconnection.QConnection(pandas = True, host = 'myhost', port = myport)
print 'initiating connection(s)'
q.open()
while True:
msg = q.receive(data_only = True, raw = False)
print 'message received'
Now, on the kdb side:
/send a table (which just so happens to have blank/null chars)
neg[4](`upd;`trade;([] col1:`a`b`c;col2:" a"))
/no problem
/send last row of that table
neg[4](`upd;`trade;-1#([] col1:`a`b`c;col2:" a"))
/no problem
/send two rows (2 blank chars)
neg[4](`upd;`trade;2#([] col1:`a`b`c;col2:" a"))
/no problem
/send first row of that table (one blank char)
neg[4](`upd;`trade;1#([] col1:`a`b`c;col2:" a"))
/crashes with error "AttributeError: 'float' object has no attribute 'meta'"
It seems to only have a problem when I send a single row table which has a null char. It's fine with more than one null char. It's fine with a single row table with non-null char. And everything is fine without the Pandas=True option (but I need pandas=True for my use case).
Any ideas?
This is a bug in the qPython library in version < 1.2.1.
I've contributed a pull request with the fix to the maintainer.