__init__.py 1.96 KB
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#! /usr/bin/env python
# graph_tool.py -- a general graph manipulation python module
#
# Copyright (C) 2007 Tiago de Paula Peixoto <tiago@forked.de>
#
# This program 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 3 of the License, or
# (at your option) any later version.
#
# This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.

import sys
# RTLD_GLOBAL needs to be set in dlopen() if we want typeinfo and friends to
# work properly across DSO boundaries. See http://gcc.gnu.org/faq.html#dso

# The "except" is because the dl module raises a system error on ia64 and x86_64
# systems because "int" and addresses are different sizes.
try:
    from dl import RTLD_LAZY, RTLD_NOW, RTLD_GLOBAL
except ImportError:
    RTLD_LAZY = 1
    RTLD_NOW = 2
    RTLD_GLOBAL = 256
_orig_dlopen_flags = sys.getdlopenflags()

sys.setdlopenflags(RTLD_LAZY|RTLD_GLOBAL)
import libgraph_tool_misc
sys.setdlopenflags(_orig_dlopen_flags) # reset it to normal case to avoid
                                       # unnecessary symbol collision
import random, sys
__all__ = ["random_rewire"]

def random_rewire(g, strat="uncorrelated", self_loops = False,
                  parallel_edges = False, seed = 0):
    if seed != 0:
        seed = random.randint(0, sys.maxint)
    if g.is_reversed():
        was_reversed = True
    else:
        was_reversed = False
    g.set_reversed(False)
    libgraph_tool_misc.random_rewire(g._Graph__graph, strat, self_loops,
                                     parallel_edges, seed)
    if was_reversed:
        g.set_reversed(True)