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Added PersistentDictionary.
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@ -38,6 +38,7 @@ Data structures for Python.
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import fix
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import types
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import string
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class RingBuffer(object):
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"""Class to represent a fixed-size ring buffer."""
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@ -340,3 +341,30 @@ class TwoWayDictionary(dict):
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value = self[key]
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dict.__delitem__(self, key)
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dict.__delitem__(self, value)
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class PersistentDictionary(dict):
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_trans = string.maketrans('\r\n', ' ')
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_locals = locals
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_globals = globals
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def __init__(self, filename, globals=None, locals=None):
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mylocals = locals
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myglobals = globals
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if mylocals is None:
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mylocals = self._locals()
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if myglobals is None:
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myglobals = self._globals()
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self.filename = filename
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try:
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fd = file(filename, 'r')
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s = fd.read()
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fd.close()
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s.translate(self._trans)
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super(self.__class__, self).__init__(eval(s, myglobals, mylocals))
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except IOError:
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pass
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def close(self):
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fd = file(self.filename, 'w')
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fd.write(repr(self))
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fd.close()
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@ -574,6 +574,19 @@ class TwoWayDictionaryTestCase(unittest.TestCase):
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del d['bar']
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self.failIf('bar' in d)
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self.failIf('foo' in d)
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class PersistentDictionaryTestCase(unittest.TestCase):
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def test(self):
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d = PersistentDictionary('test.dict')
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d['foo'] = 'bar'
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d[1] = 2
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d.close()
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d1 = PersistentDictionary('test.dict')
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self.failUnless('foo' in d)
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self.assertEqual(d['foo'], 'bar')
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self.failUnless(1 in d)
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self.assertEqual(d[1], 2)
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# vim:set shiftwidth=4 tabstop=8 expandtab textwidth=78:
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