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43 lines
1.6 KiB
Python
43 lines
1.6 KiB
Python
import collections, itertools, functools
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objnums = collections.defaultdict(itertools.count)
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@functools.total_ordering
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class NummedObj(object):
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"""
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This is useful for nicer debug printouts. Instead of objects of the same class being
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distinguished from one another by their memory address, they each get a unique number, which
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can be read as "the first object of this class", "the second object of this class", etc. This
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is especially useful because separate runs of a program will yield identical debug output,
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(assuming that the objects get created in the same order in each run). This makes it possible
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to diff outputs from separate runs to see what changed, without having to ignore a difference
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on every line due to different memory addresses of objects.
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"""
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def __init__(self, klass=None):
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"""
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@param klass: in which class are you counted? If default value of `None', then self.__class__ will be used.
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"""
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if klass is None:
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klass = self.__class__
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self._classname = klass.__name__
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self._objid = objnums[self._classname].next()
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def __repr__(self):
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return "<%s #%d>" % (self._classname, self._objid,)
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def __lt__(self, other):
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if isinstance(other, NummedObj):
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return (self._objid, self._classname,) < (other._objid, other._classname,)
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return NotImplemented
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def __eq__(self, other):
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if isinstance(other, NummedObj):
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return (self._objid, self._classname,) == (other._objid, other._classname,)
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return NotImplemented
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def __hash__(self):
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return id(self)
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