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41 lines
1.1 KiB
Python
41 lines
1.1 KiB
Python
from __future__ import absolute_import, division, print_function, unicode_literals
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from collections import defaultdict
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class Cache(object):
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def __init__(self):
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self._value_to_index = {}
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self._index_to_value = []
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def value_to_index(self, value, **kwds):
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index = self._value_to_index.get(value, None)
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if index is None:
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index = len(self._index_to_value)
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self._index_to_value.append((value, kwds))
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self._value_to_index[value] = index
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return index
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def index_to_value(self, index):
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return self._index_to_value[index]
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def NamedCache():
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return defaultdict(Cache)
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def cache_by_key(d, keyfunc=None, exclude=None):
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cache = defaultdict(Cache)
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exclude = exclude or None
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keyfunc = keyfunc or (lambda x: x)
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def visit(item):
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if isinstance(item, list):
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for i, x in enumerate(item):
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item[i] = visit(x)
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elif isinstance(item, dict):
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for k, v in item.items():
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item[k] = visit(v)
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return item
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return cache
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