collection | make golang map and slice | Map library
kandi X-RAY | collection Summary
kandi X-RAY | collection Summary
Collection provides a fluent, convenient wrapper for working with arrays of data. You can easily convert a map or an array into a Collection with the method Collect(). And then you can use the powerful and graceful apis of Collection to process the data. In general, Collection are immutable, meaning every Collection method returns an entirely new Collection instance.
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Lines of Code : 73License : Non-SPDX (Apache License 2.0)
Copydef add_collection_def(meta_graph_def, key, graph=None,
export_scope=None, exclude_nodes=None,
override_contents=None):
"""Adds a collection to MetaGraphDef protocol buffer.
Args:
meta_graph_def: def counting_sort(collection):
"""Pure implementation of counting sort algorithm in Python
:param collection: some mutable ordered collection with heterogeneous
comparable items inside
:return: the same collection ordered by ascending def insort_right(
sorted_collection: list[int], item: int, lo: int = 0, hi: int = -1
) -> None:
"""
Inserts a given value into a sorted array after other values with the same value.
It has the same interface as
https://docs.py Community Discussions
Trending Discussions on collection
QUESTION
I am trying to connect to Postgress and create a folder test.db via Flask. When I run "python3" in the terminal and from there when I run "from app import db" I get an import error:
...ANSWER
Answered 2021-Oct-11 at 10:45Use older version of python (eg 3.8)
QUESTION
In the current stable Rust, is there a way to write a function equivalent to BTreeMap::pop_last?
The best I could come up with is:
...ANSWER
Answered 2022-Mar-15 at 16:55Is there a way to work around this issue without imposing additional constraints on map key and value types?
It doesn't appear doable in safe Rust, at least not with reasonable algorithmic complexity. (See Aiden4's answer for a solution that does it by re-building the whole map.)
But if you're allowed to use unsafe, and if you're determined enough that you want to delve into it, this code could do it:
QUESTION
I am trying to set up Firebase with next.js. I am getting this error in the console.
FirebaseError: Expected first argument to collection() to be a CollectionReference, a DocumentReference or FirebaseFirestore
This is one of my custom hook
...ANSWER
Answered 2022-Jan-07 at 19:07Using getFirestore from lite library will not work with onSnapshot. You are importing getFirestore from lite version:
QUESTION
I need help to make the snippet below. I need to merge two files and performs computation on matched lines
I have oldFile.txt which contains old data and newFile.txt with an updated sets of data.
I need to to update the oldFile.txt based on the data in the newFile.txt and compute the changes in percentage. Any idea will be very helpful. Thanks in advance
...ANSWER
Answered 2021-Dec-10 at 13:31Here is a sample code to output what you need.
I use the formula below to calculate pct change.
percentage_change = 100*(new-old)/old
If old is 0 it is changed to 1 to avoid division by zero error.
QUESTION
I am trying to find a more efficient solution to a combinatorics problem than the solution I have already found.
Suppose I have a set of N objects (indexed 0..N-1) and wish to consider each subset of size K (0<=K<=N). There are S=C(N,K) (i.e., "N choose K") such subsets. I wish to map (or "encode") each such subset to a unique integer in the range 0..S-1.
Using N=7 (i.e., indexes are 0..6) and K=4 (S=35) as an example, the following mapping is the goal:
0 1 2 3 --> 0
0 1 2 4 --> 1
...
2 4 5 6 --> 33
3 4 5 6 --> 34
N and K were chosen small for the purposes of illustration. However, in my actual application, C(N,K) is far too large to obtain these mappings from a lookup table. They must be computed on-the-fly.
In the code that follows, combinations_table is a pre-computed two-dimensional array for fast lookup of C(N,K) values.
All code given is compliant with the C++14 standard.
If the objects in a subset are ordered by increasing order of their indexes, the following code will compute that subset's encoding:
...ANSWER
Answered 2021-Oct-21 at 02:18Take a look at the recursive formula for combinations:
Suppose you have a combination space C(n,k). You can divide that space into two subspaces:
C(n-1,k-1)all combinations, where the first element of the original set (of lengthn) is presentC(n-1, k)where first element is not preset
If you have an index X that corresponds to a combination from C(n,k), you can identify whether the first element of your original set belongs to the subset (which corresponds to X), if you check whether X belongs to either subspace:
X < C(n-1, k-1): belongsX >= C(n-1, k-1): doesn't belong
Then you can recursively apply the same approach for C(n-1, ...) and so on, until you've found the answer for all n elements of the original set.
Python code to illustrate this approach:
QUESTION
dict keeps insertion order since Python 3.6 (see this).
OrderedDict was developed just for this purpose (before Python 3.6).
Since Python 3.6, is the key order always the same for dict or OrderedDict?
I wonder whether I can do this in my code and have always the same behavior (except of equality, and some extended methods in OrderedDict) but more efficiently:
ANSWER
Answered 2021-Oct-27 at 08:38I realize that the different behavior of equality (__eq__) can be actually a major concern, why such code snippet is probably not good.
However, you could maybe still do this:
QUESTION
New to MongoDB, very new to Atlas. I'm trying to set up a trigger such that it reads all the data from a collection named Config. This is my attempt:
ANSWER
Answered 2021-Oct-14 at 18:04The connection has to be a connection to the primary replica set and the user log in credentials are of a admin level user (needs to have a permission of cluster admin)
QUESTION
I was checking the code of the toolz library's groupby function in Python and I found this:
ANSWER
Answered 2021-Sep-22 at 13:05This is a somewhat confusing trick to save a small amount of time:
We are creating a defaultdict with a factory function that returns a bound append method of a new list instance with [].append. Then we can just do d[key(item)](item) instead of d[key(item)].append(item) like we would have if we create a defaultdict that contains lists. If we don't lookup append everytime, we gain a small amount of time.
But now the dict contains bound methods instead of the lists, so we have to get the original list instance back via __self__.
__self__ is an attribute described for instance methods that returns the original instance. You can verify that with this for example:
QUESTION
I have the following Raku code:
...ANSWER
Answered 2021-Jun-13 at 11:27This is a bug. Have made an issue for it: https://github.com/rakudo/rakudo/issues/4403
I suggest using the workaround in the meantime.
QUESTION
Java records are used to implement shallowly immutable data carrier types. If the constructor accepts mutable types then we should implement explicit defensive copying to enforce immutability. e.g.
...ANSWER
Answered 2021-May-19 at 13:59You can do it already, the arguments of the constructor are mutable:
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