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resolved most of the comments from @samuelshaner

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This commit is contained in:
Adam Nelson 2016-11-11 20:37:03 -05:00
parent 2a50aff588
commit d4f4166ba7
5 changed files with 110 additions and 132 deletions
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20
openmc/data/library.py
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@ -5,6 +5,7 @@ import h5py
from openmc.mixin import EqualityMixin
from openmc.clean_xml import clean_xml_indentation
from openmc.checkvalue import check_type
class DataLibrary(EqualityMixin):
@ -95,13 +96,14 @@ class DataLibrary(EqualityMixin):
method='xml')
@classmethod
def from_xml(cls, path):
def from_xml(cls, path=None):
"""Read cross section data library from an XML file.
Parameters
----------
path : str
Path to XML file to read.
path : str, optional
Path to XML file to read. If not provided, the
`OPENMC_CROSS_SECTIONS` environment variable will be used.
Returns
-------
@ -112,6 +114,18 @@ class DataLibrary(EqualityMixin):
data = cls()
# If cross_sections is None, get the cross sections from the
# OPENMC_CROSS_SECTIONS environment variable
if path is None:
path = os.environ.get('OPENMC_CROSS_SECTIONS')
# Check to make sure there was an environmental variable.
if path is None:
raise ValueError("Either path or OPENMC_CROSS_SECTIONS "
"environmental variable must be set")
check_type('path', path, str)
tree = ET.parse(path)
root = tree.getroot()
if root.find('directory') is not None: