datastation | App to easily query, script, and visualize data from every database, file, and API | JSON Processing library

I would like to get value from a child component (DropDown) and display them in a parent class (App),

I explain, I have a drop-down list that is imported into the App class, when I choose a value in this drop-down list I modify my data that is displayed in my class App,

class App :

I would like to concatenate a number of csv files with a condition on the value of a column in the fastest way possible.

I have some code that works, however it concatenates all the lines of all the csv files before i reduce the dataframe down to the stations i need (through value in the station_number column). I would like to select the rows I need first, before doing the concatenation, so it would improve the running time. Thank you for any suggestion!

I am trying to extract CSV files from 2 folders. The following code returns an error message:

[Errno 2] File b'aws_hourly_20170501.csv' does not exist: b'aws_hourly_20170501.csv'

I have a big dataframe containing to columns, one that is an ID Code named "code" and one that is the name of two train stations separated by a slash named "name"

I wanted to search all the codes associated to a station name (and being able to lookup multiple stations at a time) so it would give me a list of vectors containing the multiple codes for each station.

I used lapply to get the rows for each station but now I'm unable to look up the value in the column "code" associated with the row number.