ba5f68db3d
When calling a method in a superclass, you can/should use the super() method to get a reference to that class. The python 2 version of that method takes two parameters, the current class name, and the "self" instance. The python 3 version takes no arguments. This is better for a at least three reasons. First, this version is less verbose because you don't have to specify any arguments. Second, you don't have to remember which argument goes where (I always have to look it up), and you can't accidentally use the wrong class name, or forget to update it if you copy code from a different class. Third, this version will work correctly if you use a class decorator. I don't know exactly how the mechanics of this work, but it is referred to in a comment on this stackoverflow question: https://stackoverflow.com/questions/681953/how-to-decorate-a-class Change-Id: I427737c8f767e80da86cd245642e3b057121bc3b Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/52224 Reviewed-by: Gabe Black <gabe.black@gmail.com> Maintainer: Gabe Black <gabe.black@gmail.com> Tested-by: kokoro <noreply+kokoro@google.com>
99 lines
3.3 KiB
Python
99 lines
3.3 KiB
Python
# Copyright (c) 2006 The Regents of The University of Michigan
|
|
# All rights reserved.
|
|
#
|
|
# Redistribution and use in source and binary forms, with or without
|
|
# modification, are permitted provided that the following conditions are
|
|
# met: redistributions of source code must retain the above copyright
|
|
# notice, this list of conditions and the following disclaimer;
|
|
# redistributions in binary form must reproduce the above copyright
|
|
# notice, this list of conditions and the following disclaimer in the
|
|
# documentation and/or other materials provided with the distribution;
|
|
# neither the name of the copyright holders nor the names of its
|
|
# contributors may be used to endorse or promote products derived from
|
|
# this software without specific prior written permission.
|
|
#
|
|
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
|
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
|
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
|
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
|
|
__all__ = [ 'attrdict', 'multiattrdict', 'optiondict' ]
|
|
|
|
class attrdict(dict):
|
|
"""Wrap dict, so you can use attribute access to get/set elements"""
|
|
def __getattr__(self, attr):
|
|
if attr in self:
|
|
return self.__getitem__(attr)
|
|
return super().__getattribute__(attr)
|
|
|
|
def __setattr__(self, attr, value):
|
|
if attr in dir(self) or attr.startswith('_'):
|
|
return super().__setattr__(attr, value)
|
|
return self.__setitem__(attr, value)
|
|
|
|
def __delattr__(self, attr):
|
|
if attr in self:
|
|
return self.__delitem__(attr)
|
|
return super().__delattr__(attr)
|
|
|
|
def __getstate__(self):
|
|
return dict(self)
|
|
|
|
def __setstate__(self, state):
|
|
self.update(state)
|
|
|
|
class multiattrdict(attrdict):
|
|
"""Wrap attrdict so that nested attribute accesses automatically create
|
|
nested dictionaries."""
|
|
def __getattr__(self, attr):
|
|
try:
|
|
return super().__getattr__(attr)
|
|
except AttributeError:
|
|
if attr.startswith('_'):
|
|
raise
|
|
|
|
d = multiattrdict()
|
|
setattr(self, attr, d)
|
|
return d
|
|
|
|
class optiondict(attrdict):
|
|
"""Modify attrdict so that a missing attribute just returns None"""
|
|
def __getattr__(self, attr):
|
|
try:
|
|
return super().__getattr__(attr)
|
|
except AttributeError:
|
|
return None
|
|
|
|
if __name__ == '__main__':
|
|
x = attrdict()
|
|
x.y = 1
|
|
x['z'] = 2
|
|
print(x['y'], x.y)
|
|
print(x['z'], x.z)
|
|
print(dir(x))
|
|
print(x)
|
|
|
|
print()
|
|
|
|
del x['y']
|
|
del x.z
|
|
print(dir(x))
|
|
print(x)
|
|
|
|
print()
|
|
print("multiattrdict")
|
|
x = multiattrdict()
|
|
x.x.x.x = 9
|
|
x.y.z = 9
|
|
print(x)
|
|
print(x.y)
|
|
print(x.y.z)
|
|
print(x.z.z)
|