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"""
****
YAML
****
Read and write NetworkX graphs in YAML format.
"YAML is a data serialization format designed for human readability
and interaction with scripting languages."
See http://www.yaml.org for documentation.
Format
------
http://pyyaml.org/wiki/PyYAML
"""
__author__ = """Aric Hagberg (hagberg@lanl.gov)"""
# Copyright (C) 2004-2010 by
# Aric Hagberg <hagberg@lanl.gov>
# Dan Schult <dschult@colgate.edu>
# Pieter Swart <swart@lanl.gov>
# All rights reserved.
# BSD license.
__all__ = ['read_yaml', 'write_yaml']
import networkx as nx
from networkx.utils import open_file
@open_file(1,mode='w')
def write_yaml(G, path, encoding='UTF-8', **kwds):
"""Write graph G in YAML format to path.
YAML is a data serialization format designed for human readability
and interaction with scripting languages [1]_.
Parameters
----------
G : graph
A NetworkX graph
path : file or string
File or filename to write.
Filenames ending in .gz or .bz2 will be compressed.
encoding: string, optional
Specify which encoding to use when writing file.
Examples
--------
>>> G=nx.path_graph(4)
>>> nx.write_yaml(G,'test.yaml')
References
----------
.. [1] http://www.yaml.org
"""
try:
import yaml
except ImportError:
raise ImportError("write_yaml() requires PyYAML: http://pyyaml.org/")
yaml.dump(G, path, **kwds)
@open_file(0,mode='r')
def read_yaml(path):
"""Read graph in YAML format from path.
YAML is a data serialization format designed for human readability
and interaction with scripting languages [1]_.
Parameters
----------
path : file or string
File or filename to read. Filenames ending in .gz or .bz2
will be uncompressed.
Returns
-------
G : NetworkX graph
Examples
--------
>>> G=nx.path_graph(4)
>>> nx.write_yaml(G,'test.yaml')
>>> G=nx.read_yaml('test.yaml')
References
----------
.. [1] http://www.yaml.org
"""
try:
import yaml
except ImportError:
raise ImportError("read_yaml() requires PyYAML: http://pyyaml.org/")
G=yaml.load(path)
return G
# fixture for nose tests
def setup_module(module):
from nose import SkipTest
try:
import yaml
except:
raise SkipTest("PyYAML not available")
# fixture for nose tests
def teardown_module(module):
import os
os.unlink('test.yaml')
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