How to make a flat list out of a list of lists

Is there a shortcut to make a simple list out of a list of lists in Python? I can do it in a for loop, but is there some cool "one-liner"? I tried it with functools.reduce(): from functools import...

Compare two images the python/linux way

Trying to solve a problem of preventing duplicate images to be uploaded. I have two JPGs. Looking at them I can see that they are in fact identical. But for some reason they have different file...

Lambda Expressions java 8 exception : java.lang.NoSuchMethodError: java.lang.invoke.LambdaMetafactory.metaFactory

I have problem with running following code: public class LambdaTesting { public static void main(String[] args){ new LambdaTesting(); } public...

I want to change a column of month numbers in a dataframe to month name (pyspark)

I have a column of month numbers in a dataframe and want to change it to month name, so I used this: df['monthName'] = df['monthNumber'].apply(lambda x: calendar.month_name[x]) But it throws me...

Scrapy/Celery logging settings doesn't work

I'm running Scrapy spider as a Celery task. The problem is that Scrapy doesn't log into the file scrapy.log. It logs into the Celery log which. Moreover, I can see DEBUG levels inside Celery log...

Delete trigger on a AWS Lambda function in python

I have a lambda function and for that lambda function my cloudwatch event is a trigger on it... at the end of the lambda function i need to delete the trigger (cloud watch event ) on that lambda...

DynamoDB replication using Stream + Lambda

I am trying to set up DynamoDB table replication using Stream + Lambda. I was wondering how I should handle the failures. For example, I have table A and table B and I'd like to copy any update...

Using pandas Series.map to generate multiple columns for a DataFrame

Suppose I want to map a pandas Series to more than one column in a DataFrame using some function f(x). Ideally I would use one function per column. But suppose there is some heavy computation with...

write json float in scientific notation

I would like to represent floats in a JSON file in scientific notation using Python 3.6+. None of import json a = 0.001234567 print(json.dumps(a)) json.encoder.FLOAT_REPR = lambda x:...

How to create a copy of a dataframe in pyspark?

I have a dataframe from which I need to create a new dataframe with a small change in the schema by doing the following operation. >>> X = spark.createDataFrame([[1,2], [3,4]], ['a', 'b']) >>>...

Access to the params argument in a custom operator in Apache Airflow

The Problem I'd like to pass in a list of values or indeed any value as an argument to a custom Operator, modify the value(s) in the operator, then access those values in a sql template via the {{...

s3.getObject().promise() never returns anything

If use this code within a Lambda which complies with everything I read on stackoverflow and on the AWS SDK documentation. However, it neither returns anything nor throws an error. The code is...

How to conditionally define a lambda?

The following function will randomly "sprinkle salt" on a loaded image. For the sake of boosting performance, the conditional statement uint j = rows == 1 ? 0 : randomRow(generator); should not...

How to install and run the acme.sh inside AWS lambda?

I am interested to run this acme.sh a LetsEncrypt bash client within AWS Lambda to generate a ECDSA wildcard SSL cert. I read that AWS lambda now supports bash via Layers. The documentation within...

AWS-Batch vs EC2 vs AWS Workspaces for running batch scripts to load data to Redshift

I have multiple CSV files containing data for different tables, with different file sizes varying from 1 MB to 1.5 GB. I want to process the data (replace/remove values of columns) row by row and...

Combine AWS Lambda with Aurora Serverless

Is it possible to access Aurora Serverless DB from AWS Lambda? In my case I have a Flutter mobile application which is communicating with Lumen micro framework through RESTful API. For DB I use...

Unicode box drawing diagonals

I have a table that I'm drawing using diagonal lines in ascii. Basically a mix of /\^V<>, like this: ^ / \ < > \ / v I would prefer to write this using unicode characters more fit for...

I am getting "code challenge required" when using IdentityServer4

I am trying to redirect to IdentityServer for authorization, and getting "code challenge required" in redirect URL. An error message shows invalid_request with code challenge required, and also my...

AWS CDK: how do I reference cross-stack resources in same app?

I have an App that has two stacks, both within the same region/account. One of those stacks requires the ARN of a lambda that exists in the other stack. How do I reference this? // within stackA...

activebackground option on tkinter button not taken into account on windows 10

I am using tkinter buttons and added the activebackground argument to them which make the background of the button becoming colored with the color you want when the button is being...

Is it possible to put lambda expressions into a map or list in C++?

@DanielLangr @luxun @cdhowie sorry for the XY problem. i am not sure i can explain well, but i try my best. the situation is almost like this: there is a base object "Worker" and some children....

Can't deploy container image to lambda function

I try to deploy container image to lambda function, but this error message appear The image manifest or layer media type for the source image <image_source> is not supported. here is my...

Jest regex to match certain test files

I have integration tests under dir src/test/integration. All files are named like so: foo.integration.js. Running Jest: jest ".*\\.integration\\.js" produces this error: No tests found, exiting...

Best way to call external API's one for getting token and other for fetching details with token using node js lambda

const got = require('got'); var config = { url: '/authorization/tokenrequest', body: data, // method: 'post', headers: { 'Content-Type': 'application/json', ...

Periodically lost messages in AWS SNS

I know, it is sounds strange, but something is wrong with my AWS SNS =) I have lambda function, which is sending messages to AWS SNS. Also I have several SQS as subscriptions for my SNS. Also, I...

Sending raw transaction from web3py: TypeError: <lambda>() missing 4 required positional arguments: 'hash', 'r', 's', and 'v'

I am trying to send raw transaction by web3py using this code: t = w3.eth.account.sign_transaction(test_contract.functions.edit("test").buildTransaction( { "nonce":...

Error Code: 0 ExceptionMessage: Http failure response for (unknown url): 0 Unknown Error in Angular 5

I am getting this error "Error Code: 0 ExceptionMessage: Http failure response for (unknown URL): 0 Unknown Error" on my Angular 5 project. However, I am not able to recreate this issue, I saw...

Install libreoffice on lambda nodejs 12.0 but can not run command when deployed

I try to install libreoffice to docker image of lambda function. When I run it on local machine it work fine but when deployed the image to lambda function, It keeps saying "failed to read path...

Error 'dict' object is not callable in requesting data from tweepy API

I was trying to retrieve tweets via tweepy API with the following code but the json dictionary that was retrieved had an error. The Code: import tweepy from tweepy import OAuthHandler from tweepy...

How to create AWS resources to run a CDK application locally using SAM?

I have an application called Example4Be, I have a stack that creates the AWS non-Lambda resources (just DynamoDB in this case, but could be SQS, SNS, etc): import * as cdk from...