我们从Python开源项目中，提取了以下43个代码示例，用于说明如何使用shelve.Shelf()。
def test_mutable_entry(self): d1 = byteskeydict() s = shelve.Shelf(d1, protocol=2, writeback=False) s['key1'] = [1,2,3,4] self.assertEqual(s['key1'], [1,2,3,4]) s['key1'].append(5) self.assertEqual(s['key1'], [1,2,3,4]) s.close() d2 = byteskeydict() s = shelve.Shelf(d2, protocol=2, writeback=True) s['key1'] = [1,2,3,4] self.assertEqual(s['key1'], [1,2,3,4]) s['key1'].append(5) self.assertEqual(s['key1'], [1,2,3,4,5]) s.close() self.assertEqual(len(d1), 1) self.assertEqual(len(d2), 1)
def test_mutable_entry(self): d1 = {} s = shelve.Shelf(d1, protocol=2, writeback=False) s['key1'] = [1,2,3,4] self.assertEqual(s['key1'], [1,2,3,4]) s['key1'].append(5) self.assertEqual(s['key1'], [1,2,3,4]) s.close() d2 = {} s = shelve.Shelf(d2, protocol=2, writeback=True) s['key1'] = [1,2,3,4] self.assertEqual(s['key1'], [1,2,3,4]) s['key1'].append(5) self.assertEqual(s['key1'], [1,2,3,4,5]) s.close() self.assertEqual(len(d1), 1) self.assertEqual(len(d2), 1)
def test_close(self): d1 = {} s = shelve.Shelf(d1, protocol=2, writeback=False) s['key1'] = [1,2,3,4] self.assertEqual(s['key1'], [1,2,3,4]) self.assertEqual(len(s), 1) s.close() self.assertRaises(ValueError, len, s) try: s['key1'] except ValueError: pass else: self.fail('Closed shelf should not find a key')
def test_in_memory_shelf(self): d1 = byteskeydict() s = shelve.Shelf(d1, protocol=0) s['key1'] = (1,2,3,4) self.assertEqual(s['key1'], (1,2,3,4)) s.close() d2 = byteskeydict() s = shelve.Shelf(d2, protocol=1) s['key1'] = (1,2,3,4) self.assertEqual(s['key1'], (1,2,3,4)) s.close() self.assertEqual(len(d1), 1) self.assertEqual(len(d2), 1) self.assertNotEqual(d1.items(), d2.items())
def test_keyencoding(self): d = {} key = 'Pöp' # the default keyencoding is utf-8 shelve.Shelf(d)[key] = [1] self.assertIn(key.encode('utf-8'), d) # but a different one can be given shelve.Shelf(d, keyencoding='latin1')[key] = [1] self.assertIn(key.encode('latin1'), d) # with all consequences s = shelve.Shelf(d, keyencoding='ascii') self.assertRaises(UnicodeEncodeError, s.__setitem__, key, [1])
def test_writeback_also_writes_immediately(self): # Issue 5754 d = {} key = 'key' encodedkey = key.encode('utf-8') s = shelve.Shelf(d, writeback=True) s[key] = [1] p1 = d[encodedkey] # Will give a KeyError if backing store not updated s['key'].append(2) s.close() p2 = d[encodedkey] self.assertNotEqual(p1, p2) # Write creates new object in store
def __init__(self, filename, flag='c', protocol=None, keyencoding='utf-8'): self.db = filename self.flag = flag self.dict = {} with dbm.open(self.db, self.flag) as db: for k in db.keys(): v = BytesIO(db[k]) self.dict[k] = Unpickler(v).load() shelve.Shelf.__init__(self, self.dict, protocol, False, keyencoding)
def test_in_memory_shelf(self): d1 = {} s = shelve.Shelf(d1, protocol=0) s['key1'] = (1,2,3,4) self.assertEqual(s['key1'], (1,2,3,4)) s.close() d2 = {} s = shelve.Shelf(d2, protocol=1) s['key1'] = (1,2,3,4) self.assertEqual(s['key1'], (1,2,3,4)) s.close() self.assertEqual(len(d1), 1) self.assertNotEqual(d1, d2)
def test_writeback_also_writes_immediately(self): # Issue 5754 d = {} s = shelve.Shelf(d, writeback=True) s['key'] = [1] p1 = d['key'] # Will give a KeyError if backing store not updated s['key'].append(2) s.close() p2 = d['key'] self.assertNotEqual(p1, p2) # Write creates new object in store
def _empty_mapping(self): if self._in_mem: x= shelve.Shelf({}, **self._args) else: self.counter+=1 x= shelve.open(self.fn+str(self.counter), **self._args) self._db.append(x) return x
def test_keyencoding(self): d = {} key = 'Pöp' # the default keyencoding is utf-8 shelve.Shelf(d)[key] = [1] self.assertIn(key.encode('utf-8'), d) # but a different one can be given shelve.Shelf(d, keyencoding='latin-1')[key] = [1] self.assertIn(key.encode('latin-1'), d) # with all consequences s = shelve.Shelf(d, keyencoding='ascii') self.assertRaises(UnicodeEncodeError, s.__setitem__, key, [1])
def _empty_mapping(self): if self._in_mem: x= shelve.Shelf(byteskeydict(), **self._args) else: self.counter+=1 x= shelve.open(self.fn+str(self.counter), **self._args) self._db.append(x) return x
