def test_MutableMapping_subclass(self):
# Test issue 9214
mymap = UserDict()
mymap['red'] = 5
self.assertIsInstance(mymap.keys(), Set)
self.assertIsInstance(mymap.keys(), KeysView)
self.assertIsInstance(mymap.items(), Set)
self.assertIsInstance(mymap.items(), ItemsView)
mymap = UserDict()
mymap['red'] = 5
z = mymap.keys() | {'orange'}
self.assertIsInstance(z, set)
list(z)
mymap['blue'] = 7 # Shouldn't affect 'z'
self.assertEqual(sorted(z), ['orange', 'red'])
mymap = UserDict()
mymap['red'] = 5
z = mymap.items() | {('orange', 3)}
self.assertIsInstance(z, set)
list(z)
mymap['blue'] = 7 # Shouldn't affect 'z'
self.assertEqual(sorted(z), [('orange', 3), ('red', 5)])
python类ItemsView()的实例源码
def test_abc_registry(self):
d = dict(a=1)
self.assertIsInstance(d.viewkeys(), collections.KeysView)
self.assertIsInstance(d.viewkeys(), collections.MappingView)
self.assertIsInstance(d.viewkeys(), collections.Set)
self.assertIsInstance(d.viewkeys(), collections.Sized)
self.assertIsInstance(d.viewkeys(), collections.Iterable)
self.assertIsInstance(d.viewkeys(), collections.Container)
self.assertIsInstance(d.viewvalues(), collections.ValuesView)
self.assertIsInstance(d.viewvalues(), collections.MappingView)
self.assertIsInstance(d.viewvalues(), collections.Sized)
self.assertIsInstance(d.viewitems(), collections.ItemsView)
self.assertIsInstance(d.viewitems(), collections.MappingView)
self.assertIsInstance(d.viewitems(), collections.Set)
self.assertIsInstance(d.viewitems(), collections.Sized)
self.assertIsInstance(d.viewitems(), collections.Iterable)
self.assertIsInstance(d.viewitems(), collections.Container)
def test_abc_registry(self):
d = dict(a=1)
self.assertIsInstance(d.viewkeys(), collections.KeysView)
self.assertIsInstance(d.viewkeys(), collections.MappingView)
self.assertIsInstance(d.viewkeys(), collections.Set)
self.assertIsInstance(d.viewkeys(), collections.Sized)
self.assertIsInstance(d.viewkeys(), collections.Iterable)
self.assertIsInstance(d.viewkeys(), collections.Container)
self.assertIsInstance(d.viewvalues(), collections.ValuesView)
self.assertIsInstance(d.viewvalues(), collections.MappingView)
self.assertIsInstance(d.viewvalues(), collections.Sized)
self.assertIsInstance(d.viewitems(), collections.ItemsView)
self.assertIsInstance(d.viewitems(), collections.MappingView)
self.assertIsInstance(d.viewitems(), collections.Set)
self.assertIsInstance(d.viewitems(), collections.Sized)
self.assertIsInstance(d.viewitems(), collections.Iterable)
self.assertIsInstance(d.viewitems(), collections.Container)
6_16_dictsorted.py 文件源码
项目：Python_Master-the-Art-of-Design-Patterns
作者: PacktPublishing
项目源码
文件源码
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def items(self):
return ItemsView(self)
def items(self):
"D.items() -> a set-like object providing a view on D's items"
return ItemsView(self)
def sort(value):
""" The filter to return the sorted order of a list """
if isinstance(value, (ItemsView, list)):
return sorted(value)
return value
def items(self):
"""
Get all the items of the configuration (key/value pairs).
:return tuple: The items of the configuration.
"""
return ItemsView(self)
def viewitems(self):
"""Set-like object providing a view of index items.
>>> index = Index('/tmp/diskcache/index')
>>> index.clear()
>>> index.update({'a': 1, 'b': 2, 'c': 3})
>>> items_view = index.viewitems()
>>> ('b', 2) in items_view
True
:return: items view
"""
return ItemsView(self)
def items(self):
"""Set-like object providing a view of index items.
>>> index = Index('/tmp/diskcache/index')
>>> index.clear()
>>> index.update({'a': 1, 'b': 2, 'c': 3})
>>> items_view = index.items()
>>> ('b', 2) in items_view
True
:return: items view
"""
return ItemsView(self)
def viewitems(self):
return collections.ItemsView(self)
def __eq__(self, other):
if not isinstance(other, (Message, Mapping)):
return NotImplemented
return dict(ItemsView(self)) == dict(ItemsView(other))
def items(message: Message) -> ItemsView:
return ItemsView(message)
6_16_dictsorted.py 文件源码
项目：Python-Journey-from-Novice-to-Expert
作者: PacktPublishing
项目源码
文件源码
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def items(self):
return ItemsView(self)
def update(self, tablename, update_args, query_args=None):
"""Very simple "generic" update helper.
will generate the update statement, converting the `update_args`
dict into "key = value, key = value" statements, and converting
the `query_args` dict into "key = value AND key = value"
statements. string values will be wrapped in 'quotes', while
other types will be left as their python representation.
"""
if not self.transaction:
raise DatabaseError("No transaction in progress")
query = "UPDATE {} SET ".format(tablename)
arglist = []
qnum = 1
if isinstance(update_args, dict):
update_args = update_args.items()
if isinstance(update_args, (list, tuple, ItemsView)):
setstmts = []
for k, v in update_args:
setstmts.append("{} = ${}".format(k, qnum))
qnum += 1
arglist.append(v)
query += ', '.join(setstmts)
else:
raise DatabaseError("expected dict or list for update_args")
if isinstance(query_args, dict):
query_args = query_args.items()
if isinstance(query_args, (list, tuple, ItemsView)):
query += " WHERE "
wherestmts = []
# TODO: support OR somehow?
for k, v in query_args:
wherestmts.append("{} = ${}".format(k, qnum))
qnum += 1
arglist.append(v)
query += ' AND '.join(wherestmts)
elif query_args is not None:
raise DatabaseError("expected dict or list or None for query_args")
resp = await self.connection.execute(query, *arglist)
if resp and resp[0].startswith("ERROR:"):
raise DatabaseError(resp)
return resp
