FeatureEnVi: Visual Analytics for Feature Engineering Using Stepwise Selection and Semi-Automatic Extraction Approaches
https://doi.org/10.1109/TVCG.2022.3141040
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76 lines
2.3 KiB
76 lines
2.3 KiB
# Copyright 2015 MongoDB, Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License",
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Tools for working with read concerns."""
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from bson.py3compat import string_type
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class ReadConcern(object):
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"""ReadConcern
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:Parameters:
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- `level`: (string) The read concern level specifies the level of
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isolation for read operations. For example, a read operation using a
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read concern level of ``majority`` will only return data that has been
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written to a majority of nodes. If the level is left unspecified, the
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server default will be used.
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.. versionadded:: 3.2
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"""
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def __init__(self, level=None):
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if level is None or isinstance(level, string_type):
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self.__level = level
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else:
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raise TypeError(
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'level must be a string or None.')
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@property
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def level(self):
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"""The read concern level."""
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return self.__level
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@property
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def ok_for_legacy(self):
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"""Return ``True`` if this read concern is compatible with
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old wire protocol versions."""
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return self.level is None or self.level == 'local'
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@property
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def document(self):
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"""The document representation of this read concern.
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.. note::
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:class:`ReadConcern` is immutable. Mutating the value of
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:attr:`document` does not mutate this :class:`ReadConcern`.
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"""
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doc = {}
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if self.__level:
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doc['level'] = self.level
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return doc
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def __eq__(self, other):
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if isinstance(other, ReadConcern):
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return self.document == other.document
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return NotImplemented
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def __repr__(self):
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if self.level:
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return 'ReadConcern(%s)' % self.level
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return 'ReadConcern()'
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DEFAULT_READ_CONCERN = ReadConcern()
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