Usage | Android App to keep a track of how much time | Mobile Application library

I sort of need help here, honestly not sure where I went wrong, here is the full code. I am sort of new, just trying to bring back the mention user and the reason back in a message instead of doing anything with this information.

I read this answer, which clarified a lot of things, but I'm still confused about how I should go about designing my primary key.

First off I want to clarify the idea of WCUs. I get that WCU is the write capacity of max 1kb per second. Does it mean that if writing a piece of data takes 0.25 seconds, I would need 4 of those to be billed 1 WCU? Or each time I write something it consumes 1 WCU, but I could also write X times within 1 second and still be billed 1 WCU?

Usage

I want to create a table that stores the form data for a set of gyms (95% will be waivers, the rest will be incidents reports). Most of the time, each forms will be accessed directly via its unique ID. I also want to query the forms by date, form, userId, etc..

We can assume an average of 50k forms per gym

Options

• First option is straight forward: having the formId be the partition key. What I don't like about this option is that scan operations will always filter out 90% of the data (i.e. the forms from other gyms), which isn't good for RCUs.

• Second option is that I would make the gymId the partition key, and add a sort key for the date, formId, userId. To implement this option I would need to know more about the implications of having 50k records on one partition key.

• Third option is to have one table per gyms and have the formId as partition key. This seems to be like the best option for now, but I don't really like the idea of having a a large number of tables doing the same thing in my account.

Is there another option? Which one of the three is better?

Edit: I'm assuming another option would be SimpleDB?

Ansible 2.11.0

I have a shell script that accepts 2 parameters that I want to run on a Windows host, but want to run it inside git-bash.exe. I've tried this,

This is the code I have written for the MPI's Group Communication Primitives-Brod cast example using c language try with Ubuntu system. I wrote a code for the string and variable concatenation here.

When I am compiling this code it shows error like that.(Please refer the image)

Can anyone help me to solve this?

I have this:

I know there are some other questions (with answers) to this topic. But no of these was helpful for me.

I have a postfix server (postfix 3.4.14 on debian 10) with following configuration (only the interesting section):

So I have a problem that I have been noticing with selenium when I run it headless where some pages don't totally load/render some elements. I don't exactly know what's happening not to load 100%; maybe JS not running?

My code:

I am trying to convert form data to JSON to be sent using Jquery. I understand that this has been asked many times on SO, so far this is the best answer I have found

https://stackoverflow.com/a/11339012/492015

Answer from link above

I am very new to Python. I have a dummy dataset (25 X 6) for practice. Out of 6 columns, I have 1 target variable (binary) and 5 independent variables (4 categorical and 1 numeric). I am trying to view my target distribution by the values within each of the 4 categorical columns (and without writing code for separate columns - but with a for loop usage so that I can scale it up for bigger datasets in the future). Something like below:

I am already successful in doing that (image above), but since I could only think of achieving this by using counters inside a for loop, I don't think this is Python elegant, and pretty sure there could be a better way of doing it (something like CarWash.groupby([i,'ReversedPayment']).size().reset_index().pivot(index = i,columns = 'ReversedPayment',values=0).axes.plot(kind='bar', stacked=True). I am struggling in handling this ax = setting) Below is my non-elegant Python code (not scalable):