/usr/share/pyshared/mvpa/misc/args.py is in python-mvpa 0.4.8-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
# See COPYING file distributed along with the PyMVPA package for the
# copyright and license terms.
#
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"""Helpers for arguments handling."""
__docformat__ = 'restructuredtext'
def split_kwargs(kwargs, prefixes=[]):
"""Helper to separate kwargs into multiple groups
:Parameters:
prefixes : list of basestrings
Each entry sets a prefix which puts entry with key starting
with it into a separate group.
Group '' corresponds to 'leftovers'
:Output:
dictionary with keys == `prefixes`
"""
if not ('' in prefixes):
prefixes = prefixes + ['']
result = [ [] for i in prefixes ]
for k,v in kwargs.iteritems():
for i,p in enumerate(prefixes):
if k.startswith(p):
result[i].append((k.replace(p,'',1), v))
break
resultd = dict((p,dict(x)) for p,x in zip(prefixes, result))
return resultd
def group_kwargs(prefixes, assign=False, passthrough=False):
"""Decorator function to join parts of kwargs together
:Parameters:
prefixes : list of basestrings
Prefixes to split based on. See `split_kwargs`
assign : bool
Flag to assign the obtained arguments to self._<prefix>_kwargs
passthrough : bool
Flag to pass joined arguments as <prefix>_kwargs argument.
Usually it is sufficient to have either assign or passthrough.
If none of those is True, decorator simply filters out mentioned
groups from being passed to the method
Example: if needed to join all args which start with 'slave<underscore>'
together under slave_kwargs parameter
"""
def decorated_method(method):
def do_group_kwargs(self, *args_, **kwargs_):
if '' in prefixes:
raise ValueError, \
"Please don't put empty string ('') into prefixes"
# group as needed
splits = split_kwargs(kwargs_, prefixes)
# adjust resultant kwargs__
kwargs__ = splits['']
for prefix in prefixes:
skwargs = splits[prefix]
k = '%skwargs' % prefix
if k in kwargs__:
# is unprobable but can happen
raise ValueError, '%s is already given in the arguments' % k
if passthrough: kwargs__[k] = skwargs
if assign: setattr(self, '_%s' % k, skwargs)
return method(self, *args_, **kwargs__)
do_group_kwargs.func_name = method.func_name
return do_group_kwargs
return decorated_method
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