lean | Django Rest Framework Boilerplate and Pre | REST library
kandi X-RAY | lean Summary
kandi X-RAY | lean Summary
Django Rest Framework Boilerplate and Pre built infrastructure for large scales.
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QUESTION
I am able to use SQLite3
as the database (DB) and get Treeview
to display data from the DB. However, I was wondering whether Treeview
has any functionality to censor the first few characters in a certain column for all entries?
Here is the lean code:
...ANSWER
Answered 2021-Jun-14 at 17:13You can make the substitution in the SQL query itself, by combining your desired prefix with a substring of the column, taken from the sixth character to the end.
Here's a pure Sqlite example:
QUESTION
I'm building some classes within unity to define the mechanics individually, and transition between each for easier and cleaner code.
What I wanna know, is when should I be using a constructor to pass variables around, and when to use protected variables. What are the pros and cons of each, and what should I know about them? Also what should I lean towards, like what's practical?
Previously I'd pass these variables into the PlayerState constructor, then in my classes that extend from my PlayerState would follow suit. But if they're protected variables I don't need to pass them into the constructor to access them, and I was wondering what should I do? using UnityEngine;
The new way I'm doing it:
...ANSWER
Answered 2021-Jun-12 at 04:32This is just a question related to OOP. Unity is not needed to be considered.
A constructor let you create an object instance and initialize the members of the object at the same time. If there are some immutable members (i.e. they will never be changed after construction), you may need to initialize them in constructors, and you may add the keyword readonly
to the members. If you don't need to initialize any member with passing parameter(s) when the instance is created, there is no need to have a custom constructor (unless you want to hide the default constructor).
The access modifier protected
makes the member accessible only in code in the same class, or in a class that is derived from that class. If you need to access the member in other places, you still need do it via public/internal methods such as setters and getters, or make it public
/internal
.
In your case, I think a constructor is needed to initialize the members such as player
when a PlayerState
instance is created.
QUESTION
I am parsing some interestingly formatted data from https://raw.githubusercontent.com/QuantConnect/Lean/master/Data/market-hours/market-hours-database.json
It contains a snippet (removing some days) as below:
...ANSWER
Answered 2021-May-25 at 05:29Is there a preferred way to deal with a LocalTime that represents a 24 hours span?
It's worth taking a step back and separating different concepts very carefully and being precise. A LocalTime
doesn't represent a 24 hour span - it's just a time of day. Two LocalTime
values could effectively represent a 24 hour span without reference to a specific date, yes.
If you can possibly change your JSON to use 00:00:00
, and then treat a "start==end" situation as being the full day, that's what I'd do. That does mean, however, that you can never represent an empty period.
Now, in terms of whether you should use a start and duration... that really depends on what you're trying to model. Are you trying to model a start time and an end time, or a start time and a duration? So far you've referred to the whole day as "a 24 hour span" but that's not always the case, if you're dealing with time zones that have UTC offset transitions (e.g. due to daylight saving time).
Transitions already cause potential issues with local intervals like this - if you're working on a date where the local time "falls back" from 2am to 1am, and you've got a local time period of (say) 00:30 to 01:30, then logically that will be "true" for an hour and a half of the day:
- 00:00-00:30: False
- 00:30-01:30 (first time): True
- 01:30-02:00 (first time): False
- 01:00-01:30 (second time): True
- 01:30-02:00 (second time): False
- 02:00-00:00 (next day): False
We don't really know what you're doing with the periods, but that's the sort of thing you need to be considering... likewise if you represent something as "00:00 for 24 hours" how does that work on a day which is only 23 hours long, or one that is 25 hours long? It will very much depend on exactly what you do with the data.
I would adopt a process of:
- Work out detailed requirements, including what you want to happen on days with UTC offset transitions in the specific time zone (and think up tests at this stage)
- Extract the logical values from those requirements in terms of Noda Time types (with the limitation that no, we unfortunately don't support 24:00:00 as a
LocalTime
) - Represent those types in your JSON as closely as possible
- Make your code follow your requirements documentation as closely as possible, in terms of how it handles the data
QUESTION
I am trying to set Lean engine for python on macos using vscode as described here
When I try to run the container, I get
docker: Error response from daemon: Ports are not available: listen tcp 0.0.0.0:55555: bind: address already in use.
This is the log output
...ANSWER
Answered 2021-Jan-15 at 05:23In your run command, get rid of the "--debug --debugger-agent=transport=dt_socket,server=y,address=0.0.0.0:55555,suspend=y". This is trying to consume the same port which is why you are getting the address already in use error.
Running the debugger on a different port will also work as long as it isn't one of the ports you are exposing via docker.
Glad it works, thanks!
QUESTION
Please read the below post.
index.js: ...ANSWER
Answered 2021-May-31 at 17:37In this part, you're using callback syntax so articles
is undefined
QUESTION
I am making a blog in ejs, express and node.js. To serve the index page I query the database and pass that in to the index.ejs
then I loop through which works fine but I need to have the href of the anchor set to localhost:3000/article/:title but I don't know how. Here is my code:
index.js:
ANSWER
Answered 2021-May-30 at 22:51You should add the template tag inside your string. For example, if a = "123"
, would become
.
Updating your code to fix this should solve the issue:
QUESTION
I just started leaning Vue Js, I am trying to fetch some information from an API and display it in a table. I really can't see what the problem is, I have gone through the code thoroughly but can't figure out where the problem is. Below is the code I have written. I am pretty it is something small. Or is there a new way of doing it in the current version of Vue?
...ANSWER
Answered 2021-May-28 at 10:27Problem is you are using very old version of axios (0.2.0
...from Sep 12, 2014)
If you update to current verison, it works...
QUESTION
I'm diagnosing some codegen and it's backed by some bazel macro backed by a custom bazel rule.
...ANSWER
Answered 2021-Mar-16 at 22:13bazel query --output=build //projX:all
will print out all the targets in that package after macro and glob expansion. It has comments with the macro expansion stack traces for each target, including filenames and line numbers for the macro definitions.
//projX:all
is form of wildcard which specifies all the targets in that package. Macros can only generate targets in a single package, so that will always include all targets generated from that macro invocation.
QUESTION
In my Python 2.7 program (sorry, we have a third-party precompiled Python module that's stuck at 2.7, and yes we're leaning on them to upgrade and yes they're planning on getting there), rather than having functions just return True
or False
:
ANSWER
Answered 2021-May-24 at 22:18You may want to make a separate predefined subclass of Result for a default 'Success' result.
(I misinterpreted your question at first; in case one finds this question and is just looking for a way to disable PyCharm inspections locally or globally; scroll down).
E.g:
QUESTION
I'm leaning python pandas and playing with some example data. I have a CSV file of a dataset with net worth by percentile of US population by quarter of year. I've successfully subseted the data by percentile to create three scatter plots of net worth by year, one plot for each of three population sections. However, I'm trying to combine those three plots to one data frame so I can combine the lines on a single plot figure.
Data here: https://www.federalreserve.gov/releases/z1/dataviz/download/dfa-income-levels.csv
Code thus far:
...ANSWER
Answered 2021-May-24 at 17:03I don't see the categories mentioned in your code in the csv file you shared. In order to concat dataframes along columns, you could use pd.concat
along axis=1
. It concats the columns of same index number. So first set the Date
column as index and then concat them, and then again bring back Date
as a dataframe column.
- To set
Date
column as index of dataframe,df1 = df1.set_index('Date')
anddf2 = df2.set_index('Date')
- Concat the dataframes
df1
anddf2
usingdf_merge = pd.concat([df1,df2],axis=1)
ordf_merge = pd.merge(df1,df2,on='Date')
- bringing back
Date
into column bydf_merge = df_merge.reset_index()
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