bun | SQL-first Golang ORM | SQL Database library
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kandi X-RAY | bun Summary
Simple and performant SQL database client for PostgreSQL, MySQL, MSSQL, and SQLite
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QUESTION
I am working with a flutter app. I am trying to display data from a json.
I am stuck on the following error:
LateInitializationError: Field 'data' has not been initialized error
My main.dart file is as follows:
...ANSWER
Answered 2022-Apr-10 at 16:37late List data;
should change to List? data;
. If something is non-nullable but late
, it relies on the developer to make sure this variable is initialized before it is used.
Since it's used in the build
method, in data == null ? 0 : data.length;
, it will throw an error.
Changing it to a nullable List?
fixes this.
QUESTION
I have a python flask script with a JSON that I have developed. I am trying to return the cities using this url: http://127.0.0.1:5000/restaurant/city.
I get an this error:
Internal Server Error The server encountered an internal error and was unable to complete your request. Either the server is overloaded or there is an error in the application.
I am not sure where my logic error is in my code. Can someone help me?
I am using python 3.8 and flask.
Here is my code (the json is in the code):
...ANSWER
Answered 2022-Apr-09 at 21:23a few issues with the code.
- the
restaurant
variable you provided doesnt need to be "jsonified", you can use it as is. - the path
/restaurant/city
is supposed to have thecity
as a variable from the user, to achieve that you need to declare the decorator as below. Also now the "city" is argument to the method too:
QUESTION
I'm young (a freshman in high school), so I don't know a lot about Pygame or about coding in general. For my computer science class final project, I'm making a restaurant game similar to Papa's Pizzeria. Right now, I'm just working on the basics, and one function of it is that you need to prepare the food in a certain order or you will get an error message, or get points taken off, etc. For example, if you wanted to prepare a burger, you would have to put the bun, then the burger, then the toppings... You get the idea. It wouldn't work if you put the burger before the bun. How would I accomplish this? I was thinking to use nested if statements. Also, the ingredients are put on the food by pressing the key that corresponds with the ingredient (e.g. "L" for lettuce). The code below shows what I have and hopefully will help you understand what I'm asking. The part I'm having trouble with starts at the first elif statement, I just put the rest for context.
...ANSWER
Answered 2022-Apr-04 at 00:49An important thing to understand is that events of type pygame.KEYDOWN
only represent a single key being pressed down.
The user clicking 'k' and then 'a' in any order will fire off two KEYDOWN events, all of which run your code because of the line for event in pygame.event.get():
. This is why your code will never recognize that both are being pressed at the same time. (event.key
cannot be equal to K_l and K_a)
You need to store whether a key is being pressed to accomplish your goal of recognizing when multiple keys are being used.
Hint: You can use a boolean to store whether a key is pressed
QUESTION
I have a dataset named trainset that has 50 variables. For each row, I need to sum up the values under columns called Systolic.Blood.Pressure, Blood.Urea.Nitrogen, Blood.Sodium, Age, heart.rR and COPD values. I already defined a function to sum these up:
...ANSWER
Answered 2022-Mar-25 at 12:19This is a more concise way to calculate the outcome:
QUESTION
I am doing a multiple linear regression with the following reproducible dataset (this is a small sample of my data):
...ANSWER
Answered 2022-Mar-27 at 07:31I would create a new column - see two options below.
(NB in lm()
you don't have to specify SB_xlsx13$
each time you add a covariate if you list it as the data =
argument once! This will make your output easier to read.)
Tidyverse approach: mutate
and case_when
:
QUESTION
The dataframe I am talking about is this
I am interested in only a subset of the products and I want to transform the data so instead of having "item" columns I have columns with the names of the products I am interested in with values of 0 or 1 indicating whether or not the said product is in the basket. What I have done so far is this
...ANSWER
Answered 2022-Mar-26 at 15:55Use:
QUESTION
I have a dataframe which includes 2 columns below |Systolic blood pressure |Urea Nitrogen| |------------------------|-------------| |155.86667|50.000000| |140.00000| 20.33333| |135.33333| 33.857143| |126.40000|15.285714| |...|...|
I want to create 2 more columns called Sys_points and BUN_points based on the bucket criteria like the image attached, which will store the values (not in equally spaced) of column Points in the image. I have tried findInterval and cut but can't find functions that allow me to assign values not in sequence order to buckets.
...ANSWER
Answered 2022-Mar-21 at 11:41Here’s how to do it using cut()
. Note the use of -Inf
and Inf
to include and
>=x
bins.
QUESTION
I've been failing (my whole day) in getting this structure formatted as a tree to present in this format, see picture attached.
as this has not parent and child the names of the key values strings like pattern_type_name act like parents and pattern_name are the child and under pattern_name are the marker_description to present the structure.
any help would be appreciated
below is the code I'm using:
...ANSWER
Answered 2022-Mar-08 at 01:40When you need to translate data from one form to another, break it into steps:
- Discover the data's structure
- How can you translate-- how do the elements shift from one to the other
- Traverse the data
- Build the new structure
So the first thing I notice about the data is that it is already packaged in JSON, which is very convenient. How is it structured?
QUESTION
I need to find and then remove rows that contain a backslash in my csv file. I tried this:
...ANSWER
Answered 2022-Mar-07 at 21:18Pandas' .str.contains
uses regular expressions by default. Add regex=False
to parameters:
QUESTION
I'm trying to parse actionscript files and I'm trying figure out a regex that determines whether a line contains a string but at the same time that string isn't a parameter of a function.
So something like this would be fine and return "derping around" without quotes.
...ANSWER
Answered 2022-Jan-26 at 19:40This regex should find the values you're looking for:
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