def core_properties(self):
"""Instance of |CoreProperties| holding read/write Dublin Core doc properties.
Creates a default core properties part if one is not present (not common).
"""
try:
return self.part_related_by(RT.CORE_PROPERTIES)
except KeyError:
core_props = CorePropertiesPart.default(self)
self.relate_to(core_props, RT.CORE_PROPERTIES)
return core_props
def it_can_construct_a_default_core_props(self):
core_props = CorePropertiesPart.default()
# verify -----------------------
assert isinstance(core_props, CorePropertiesPart)
assert core_props.content_type is CT.OPC_CORE_PROPERTIES
assert core_props.partname == '/docProps/core.xml'
assert isinstance(core_props._element, CT_CoreProperties)
assert core_props.title == 'PowerPoint Presentation'
assert core_props.last_modified_by == 'python-pptx'
assert core_props.revision == 1
# core_props.modified only stores time with seconds resolution, so
# comparison needs to be a little loose (within two seconds)
modified_timedelta = datetime.utcnow() - core_props.modified
max_expected_timedelta = timedelta(seconds=2)
assert modified_timedelta < max_expected_timedelta
