/usr/share/pyshared/glpk/model_objects.py is in python-glpk 0.4.52-1.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Filename: model_objects.py (tools for processing GnuMathProg language)
-- This code is part of the Python-GLPK interface.
--
-- Copyright (C) 2005, Joao Pedro Pedroso and Filipe Brandao
-- Faculdade de Ciencias, Universidade do Porto
-- Porto, Portugal. All rights reserved. E-mail: <jpp@fc.up.pt>.
--
-- Python-GLPK is free software; you can redistribute it and/or modify it
-- under the terms of the GNU General Public License as published by the
-- Free Software Foundation; either version 2, or (at your option) any
-- later version.
--
-- Python-GLPK 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
-- General Public License for more details.
--
-- You should have received a copy of the GNU General Public License
-- along with GLPK; see the file COPYING. If not, write to the Free
-- Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
-- 02110-1301, USA.
"""
def name_to_index(name):
if type(name)==tuple:
s = ''
for i in range(len(name)):
if i>0: s += ','
if type(name[i])==str:
if ',' not in name[i]:
t = name[i]
else:
t = "'%s'" % (name[i])
else:
t = str(name[i])
s += t
return s
else:
return name
def join_bounds(cur, new):
if cur == None:
return new
if new == None:
return cur
if new[0] == '=':
return new
else:
cur = list(cur)
if cur[0] == '=':
cur = (None, None)
if new[0] != None:
cur[0] = new[0]
if new[1] != None:
cur[1] = new[1]
return tuple(cur)
class var:
def __init__(self, prob, name, value = None, bnds = None):
self._prob = prob
self._name = name
self._subvars = None
if type(value) != dict:
self._value = value
else:
self._subvars = value
def value(self):
return self._value
def _bounds(self):
try:
bnds = self._prob._bounds[self._name]
except:
bnds = None
return bnds
def _clear(self):
self._prob._rm_bounds(self._name)
def __del__(self):
self.clear()
def _set_bounds(self, bounds):
self._prob._set_bounds(self._name, bounds)
if self._subvars:
for x in self:
self[x]._set_bounds(bounds)
def __eq__(self, value):
self._set_bounds(('=', value))
for x in self:
self[x] == value
return nothing()
def __ge__(self, value):
self._set_bounds(('>=', value))
return nothing()
def __le__(self, value):
self._set_bounds(('<=', value))
return nothing()
def __str__(self):
if self._subvars == None:
return '(var:'+str(self._value)+')'
else:
return '(var:'+str(self._subvars)+')'
def __repr__(self):
return str(self)
def __getitem__(self, name):
if self._subvars == None: return
name = name_to_index(name)
itemname = "%s[%s]" % (self._name, name)
if name not in self._subvars:
_var = var(self._prob, itemname)
self._subvars[name] = _var
else:
_var = self._subvars[name]
return _var
def __setitem__(self, name, value):
if self._subvars == None: return
name = name_to_index(name)
itemname = "%s[%s]" % (self._name, name)
new_var = var(self._prob, itemname)
self._subvars[name] = new_var
new_var == value
def __iter__(self):
if self._subvars == None: return
for x in self._subvars:
yield x
class constraint(var):
def __str__(self):
if self._subvars == None:
return '(constraint:'+str(self._value)+')'
else:
return '(constraint:'+str(self._subvars)+')'
class objective(var):
def __str__(self):
if self._subvars == None:
return '(objective:'+str(self._value)+')'
else:
return '(objective:'+str(self._subvars)+')'
class nothing:
def __repr__(self):
return ''
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