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"""
Assorted utility classes and functions.
:copyright: Copyright 2006-2022 by the PyNN team, see AUTHORS.
:license: CeCILL, see LICENSE for details.
"""
import warnings
import numpy as np
def is_listlike(obj):
"""
Check whether an object (a) can be converted into an array/list *and* has a
length. This excludes iterators, for example.
Maybe need to split into different functions, as don't always need length.
"""
return (
isinstance(obj, (list, tuple, set))
or (isinstance(obj, np.ndarray) and obj.ndim > 0)
)
class deprecated(object):
"""
Decorator to mark functions/methods as deprecated. Emits a warning when
function is called and suggests a replacement.
"""
def __init__(self, replacement=''):
self.replacement = replacement
def __call__(self, func):
def new_func(*args, **kwargs):
msg = "%s() is deprecated, and will be removed in a future release." % func.__name__
if self.replacement:
msg += " Use %s instead." % self.replacement
warnings.warn(msg, category=DeprecationWarning)
return func(*args, **kwargs)
new_func.__name__ = func.__name__
new_func.__doc__ = "*Deprecated*. Use ``%s`` instead." % self.replacement
new_func.__dict__.update(func.__dict__)
return new_func
def reraise(exception, message):
args = list(exception.args)
args[0] += message
exception.args = args
raise
def ezip(*args):
for items in zip(*args):
yield items[0], items[1:]
class IndexBasedExpression(object):
"""
Abstract base class for general expressions that use the cell indices and projection class to
determine their value instead of just the the distance between the cells
"""
@property
def projection(self):
try:
return self._projection
except AttributeError:
return None
@projection.setter
def projection(self, projection):
self._projection = projection
def __call__(self, i, j):
raise NotImplementedError
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