def from_yaml(fh,
ignore=(ValueError, NotImplementedError),
followlinks=True,
hidden=False,
relative_to_yaml_dir=False):
"""Construct a dictionary of resources from a YAML specification.
Parameters
----------
fh : file
File object referring to the YAML specification of resources to load.
ignore : tuple of Exception, optional
Ignore these exceptions when calling ``blaze.data``.
followlinks : bool, optional
Follow symbolic links.
hidden : bool, optional
Load hidden files.
relative_to_yaml_dir: bool, optional, default False
Load paths relative to yaml file's directory. Default is to load
relative to process' CWD.
Returns
-------
dict
A dictionary mapping top level keys in a YAML file to resources.
See Also
--------
data_spider : Traverse a directory tree for resources
"""
resources = {}
yaml_dir = os.path.dirname(os.path.abspath(fh.name))
for name, info in yaml.load(fh.read()).items():
with pushd(yaml_dir if relative_to_yaml_dir else os.getcwd()):
try:
source = info.pop('source')
except KeyError:
raise ValueError(
'source key not found for data source named %r' % name)
for mod in info.pop('imports', []):
importlib.import_module(mod)
if os.path.isdir(source):
resources[name] = data_spider(os.path.expanduser(source),
ignore=ignore,
followlinks=followlinks,
hidden=hidden,
extra_kwargs=info)
else:
resources[name] = bz_data(source, **info)
return resources
def from_yaml(fh,
ignore=(ValueError, NotImplementedError),
followlinks=True,
hidden=False,
relative_to_yaml_dir=False):
"""Construct a dictionary of resources from a YAML specification.
Parameters
----------
fh : file
File object referring to the YAML specification of resources to load.
ignore : tuple of Exception, optional
Ignore these exceptions when calling ``blaze.data``.
followlinks : bool, optional
Follow symbolic links.
hidden : bool, optional
Load hidden files.
relative_to_yaml_dir: bool, optional, default False
Load paths relative to yaml file's directory. Default is to load
relative to process' CWD.
Returns
-------
dict
A dictionary mapping top level keys in a YAML file to resources.
See Also
--------
data_spider : Traverse a directory tree for resources
"""
resources = {}
yaml_dir = os.path.dirname(os.path.abspath(fh.name))
for name, info in yaml.load(fh.read()).items():
with pushd(yaml_dir if relative_to_yaml_dir else os.getcwd()):
try:
source = info.pop('source')
except KeyError:
raise ValueError('source key not found for data source named %r' %
name)
for mod in info.pop('imports', []):
importlib.import_module(mod)
if os.path.isdir(source):
resources[name] = data_spider(os.path.expanduser(source),
ignore=ignore,
followlinks=followlinks,
hidden=hidden,
extra_kwargs=info)
else:
resources[name] = bz_data(source, **info)
return resources
def _spider(resource_path, ignore, followlinks, hidden, extra_kwargs):
resources = {}
for filename in (os.path.join(resource_path, x)
for x in os.listdir(resource_path)):
basename = os.path.basename(filename)
if (basename.startswith(os.curdir) and not hidden or
os.path.islink(filename) and not followlinks):
continue
if os.path.isdir(filename):
new_resources = _spider(filename, ignore=ignore,
followlinks=followlinks,
hidden=hidden,
extra_kwargs=extra_kwargs)
if new_resources:
resources[basename] = new_resources
else:
with ignoring(*ignore):
resources[basename] = bz_data(filename, **(extra_kwargs or {}))
return resources
def from_yaml(path, ignore=(ValueError, NotImplementedError), followlinks=True,
hidden=False):
"""Construct a dictionary of resources from a YAML specification.
Parameters
----------
path : str
Path to a YAML specification of resources to load
ignore : tuple of Exception, optional
Ignore these exceptions when calling ``blaze.data``
followlinks : bool, optional
Follow symbolic links
hidden : bool, optional
Load hidden files
Returns
-------
dict
A dictionary mapping top level keys in a YAML file to resources.
See Also
--------
data_spider : Traverse a directory tree for resources
"""
resources = {}
for name, info in yaml.load(path.read()).items():
try:
source = info.pop('source')
except KeyError:
raise ValueError('source key not found for data source named %r' %
name)
for mod in info.pop('imports', []):
importlib.import_module(mod)
if os.path.isdir(source):
resources[name] = data_spider(os.path.expanduser(source),
ignore=ignore,
followlinks=followlinks,
hidden=hidden,
extra_kwargs=info)
else:
resources[name] = bz_data(source, **info)
return resources
def _spider(resource_path, ignore, followlinks, hidden, extra_kwargs):
resources = {}
for filename in (os.path.join(resource_path, x)
for x in os.listdir(resource_path)):
basename = os.path.basename(filename)
if (basename.startswith(os.curdir) and not hidden
or os.path.islink(filename) and not followlinks):
continue
if os.path.isdir(filename):
new_resources = _spider(filename,
ignore=ignore,
followlinks=followlinks,
hidden=hidden,
extra_kwargs=extra_kwargs)
if new_resources:
resources[basename] = new_resources
else:
with ignoring(*ignore):
resources[basename] = bz_data(filename, **(extra_kwargs or {}))
return resources
def create_index(uri, column_name_or_names, name=None, **kwargs):
dta = bz_data(uri, **kwargs)
create_index(dta, column_name_or_names, name=name)
return dta
def create_index(uri, column_name_or_names, name=None, **kwargs):
dta = bz_data(uri, **kwargs)
create_index(dta, column_name_or_names, name=name)
return dta