defaultlist | collections.defaultdict equivalent implementation of list
kandi X-RAY | defaultlist Summary
kandi X-RAY | defaultlist Summary
collections.defaultdict equivalent implementation of list.
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Top functions reviewed by kandi - BETA
- Get a list of elements from start to stop .
- Read the metainfo .
- Initialize the factory .
- Add other to self .
- Get an item from the list .
- Normalize index .
defaultlist Key Features
defaultlist Examples and Code Snippets
Lines of Code : 7License : Permissive (MIT License)
Copypublic List getList(String key, List defaultList) {
List out = getList(key);
if (out == null) {
out = defaultList;
}
return out;
} public List getConfigList(String key, List defaultList) {
List out = getConfigList(key);
if (out == null) {
out = defaultList;
}
return out;
} public List> getObjectList(String key, List> defaultList) {
List> out = getObjectList(key);
if (out == null) {
out = defaultList;
}
return out;
} Community Discussions
Trending Discussions on defaultlist
QUESTION
I have a KissDocument.Class, from it i make Object(lets call it as obj1) and initialize his attributes from variables(let call it as SetOfVariables), which i declared before in my Form. after that i added obj1 in a List(lets call it myList), which is declared as Friend in my Form.
but when i change the SetOfVariables to another values, All Objects-Attributes in myList will be too changed.
in the following is KissDocument.Class:
...ANSWER
Answered 2020-Oct-24 at 11:44The problem is that you only create one set of List(Of String) objects and you then assign those to every KissDocument object. Consider this. Let's say that you and I buy a pack of cards between us, so we share that one pack of cards. If I play with it and lose one of the Jokers, would you be surprised to see that your pack of cards was missing a Joker? Of course not, because there's only one pack of cards. Whatever I do to my pack of cards will be reflected in your pack because they are the same pack. The same goes for your KissDocument objects: they all share the same three List(Of String) objects so any change you make through one will be reflected in the others.
The solution starts with you defining your KissDocument class properly. For a start, use properties rather than fields. Secondly, all the collection properties should be read-only and set internally:
QUESTION
let's say I have an array
...ANSWER
Answered 2020-Sep-15 at 07:03You can't have 2 two variables with the same name Firstly, set default state by:
QUESTION
In this article https://florimond.dev/blog/articles/2018/08/python-mutable-defaults-are-the-source-of-all-evil/ the following code is posted as the pythonic solution:
...ANSWER
Answered 2020-Jun-25 at 16:41The comments you got so far are correct. For further explanation about this, see "Least Astonishment" and the Mutable Default Argument
However, there's actually a work-around for what you want. I wouldn't say it's more elegant than the version 1 (that everyone uses), and it also requires one line of code inside your function: You have to create a copy of seq inside the function, so it's this copy which gets updated, and not the 'default' seq:
QUESTION
I'm creating a custom form element using Angulars ControlValueAccesor. I have three buttons in my toggle-group, one is selected by default. When I'm submitting without doing anything the form should be returning the value from the default field. Insted it returns null if I'm implementing it in an reactive form and "" out of a template-driven form.
If I'm selecting another value and then the one that was selected by default it returns the right value.
HTML
...ANSWER
Answered 2020-Apr-28 at 20:51Found a solution, I had to initialize my FormControl like this:
QUESTION
I have an array with objects that also contain array. How can I push element to that array inside object using useState?
...ANSWER
Answered 2020-Mar-19 at 00:06Assuming you want to append an item to the sublist of a specific list item, based on index:
QUESTION
I'm trying to create an custom element with Angulars ControlValueAccessor. The goal is a switch with three states, true, false and null. Null should be selected by default, I tried some solutions from other posts, but they didn't work.
I tried adding "value=null" in the mat-button-toggle-group, aswell as add the "checked" attribute in the null mat-button-toggle itself.
HTML:
...ANSWER
Answered 2020-Mar-16 at 09:34So I did some research and the problem is that the [value]="null" will assign null to the value attribute unlike if you have value=null then it assigns "null" instead of null.
and "null" is not equal to null so it won't get selected.
It has 2 solutions.
I have made you an example in stackblitz
Hope you understand what I mean.
QUESTION
I am working on an assignment in which I need to create javascript code to allow a user to input something and have it be appended to an array. This is the HTML:
...ANSWER
Answered 2020-Mar-09 at 01:38You need to get the value of the input from value attribute.
The below code will just return the reference to the input not the value.
QUESTION
On the dropdown's onchange event I am calling a JPA method which is returning a list of values and I want to display them in dropdown menu, but I am not able to parse JSON data coming from JSP into required format. Can Anyone help?
JS:
...ANSWER
Answered 2020-Mar-07 at 06:54Just removed some line of code from the JSP file. And it's working fine. I didn't know that we can convert arrayList. If am posting my cost, if anyone need they can refer it.
QUESTION
I use antd UI framework on my app. Also, I have form with the required Upload image field. Sometimes this field has defaulList. Problem is that still validation is not passed when defaultList is defined.
Upload props:
ANSWER
Answered 2020-Mar-05 at 11:13You should't use defaultFileList along with getFieldDecorator.
Antd throws a warning about this
warning:
defaultFileListis invalid forgetFieldDecoratorwill setfileList, please useoption.initialValueinstead.
Move the defaultFileList array to initialValue field of getFieldDecorator options.
QUESTION
I'm currently making my own project with Python using Inheritance Class between if I select menu from Class A, Parents Class, then moves to Class B, Child Class, and also if I select menu from Class B, Child Class, I'd like to move to Class A. How to solve this problem?
I tried to make these files with Python Decorator, but Decorator can use one file. so I tried to use Python Inheritance to free movement between Class A and Class B, but to no avail.
Main.py:
...ANSWER
Answered 2019-Jun-16 at 07:39Your FirstNews.py file is located in sub folder News
In Main file, try
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Install defaultlist
You can use defaultlist like any standard Python library. You will need to make sure that you have a development environment consisting of a Python distribution including header files, a compiler, pip, and git installed. Make sure that your pip, setuptools, and wheel are up to date. When using pip it is generally recommended to install packages in a virtual environment to avoid changes to the system.
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