Redistribution and use in source and binary forms, withor without
modification, are permitted provided that the following conditions are met:
a. Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
b. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
c. Neither the name of toolz nor the names of its contributors ""
Functionalitycopiedfromthe toolzpackagetoavoid having
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE ARE
DIRECT,INDIRECT, INCIDENTAL, SPECIAL EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (, BUTNOTLIMITEDTO OF GOODSOR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
DAMAGE. """ import operator from functools import reduce
def get_in(keys, coll, default=None, no_default=False): """
NB: This is a straight copy of the get_in implementation found in
the toolz library (https://github.com/pytoolz/toolz/). It works with persistent data structures as well as the corresponding
datastructures from the stdlib.
Returns coll[i0][i1]...[iX] where [i0, i1, ..., iX]==keys.
If coll[i0][i1]...[iX] cannot be found, returns ``default``, unless
``no_default`` is specified, then it raises KeyError or IndexError.
``get_in`` is a generalization of ``operator.getitem`` for nested data
structures such as dictionaries and lists.
>>> from pyrsistent import freeze
>>> transaction = freeze({'name': 'Alice',
... 'purchase': {'items': ['Apple', 'Orange'],
... 'costs': [0.50, 1.25]},
... 'credit card': '5555-1234-1234-1234'})
>>> get_in(['purchase', 'items', 0], transaction) 'Apple'
>>> get_in(['name'], transaction) 'Alice'
>>> get_in(['purchase', 'total'], transaction)
>>> get_in(['purchase', 'items', 'apple'], transaction)
>>> get_in(['purchase', 'items', 10], transaction)
>>> get_in(['purchase', 'total'], transaction, 0)
0
>>> get_in(['y'], {}, no_default=True)
Traceback (most recent call last):
...
KeyError: 'y' """ try: return reduce(operator.getitem, keys, coll) except (KeyError, IndexError, TypeError): if no_default: raise return default
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