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# tableiter.py: Python tableiter functions
# Copyright (C) 2006
# Associated Universities, Inc. Washington DC, USA.
#
# This library is free software; you can redistribute it and/or modify it
# under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation; either version 3 of the License, or (at your
# option) any later version.
#
# This library is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
# FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
# License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with this library; if not, write to the Free Software Foundation,
# Inc., 675 Massachusetts Ave, Cambridge, MA 02139, USA.
#
# Correspondence concerning AIPS++ should be addressed as follows:
# Internet email: aips2-request@nrao.edu.
# Postal address: AIPS++ Project Office
# National Radio Astronomy Observatory
# 520 Edgemont Road
# Charlottesville, VA 22903-2475 USA
#
# $Id: tableiter.py,v 1.6 2006/12/11 02:46:08 gvandiep Exp $
# Make interface to class TableIterProxy available.
from ._tables import TableIter
from .table import table
class tableiter(TableIter):
"""The Python interface to Casacore table iterators
A `tableiter` allows iteration through a table based on the contents
of one or more columns. Each step in the iteration process forms
a subset of the table for which the specified columns have the same value.
It can easily be constructed using the :func:`table.iter` method as done
in the example below::
t = table('3c343.MS')
for ts in t.iter('ANTENNA1'):
print ts.nrows()
In this example `ts` will be a so-called reference table which can be
operated on like any other table object.
Multiple column names should be given in a sequence (tuple or list).
"""
def __init__(self, table, columnnames, order='', sort=True):
st = sort
if isinstance(sort, bool):
st = 'heapsort'
if not sort:
st = 'nosort'
TableIter.__init__(self, table, columnnames, order, st)
def __iter__(self):
# __iter__ is needed
return self
def next(self):
# next returns a Table object, so turn that into table.
return table(self._next(), _oper=3)
def reset(self):
"""Reset the iterator to the beginning."""
self._reset()
__next__ = next
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