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rstudio_screenshot <- function(partial_name = "") {

  look_behind <- "(?<=\\s)"
  xwid_pattern <- "0x[a-f0-9]+"
  look_ahead <- 
    paste0("(?=\\s\".*",
           partial_name,
           ".*\":\\s\\(\"rstudio\"\\s\"RStudio\"\\)\\s+[0-9]{4}x[0-9]{3,4})")
    
  xwid <- 

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take_screenshot <- function() {

  xwid <- 
    system("xwininfo -root | sed -n 2p | grep -oP 0x[a-f0-9]+",
           intern = TRUE)

  magick::image_write(magick::image_read(paste0("x:", xwid)),
                      path = format(Sys.time(), "ss-%Y%m%d-%H%M%S.png"),
                      format = "png")

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import numpy as np
import datatable as dt
from datatable import f, by, mean

# Reading a CSV
url = "https://raw.githubusercontent.com/mwaskom/seaborn-data/master/iris.csv"
tbl = dt.fread(url)

# Filtering rows
tbl = tbl[f.species != "setosa", :]

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compose_quote <- function(body_part, creature_name) {
  cat(paste0("Go for the ", body_part, ", ", creature_name, "!\n"))    
}

execute <- function(fn, ...) {
  Sys.sleep(1)
  fn(...) 
  # Or: do.call(fn, list(...))
  # Or: rlang::exec(fn, ...)
}

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(defn compose-quote [body-part creature-name]
  (println (str "Go for the " body-part ", " creature-name "!")))

(defn execute [command & args]
  (Thread/sleep 1000)
  (apply command args))

(execute compose-quote "eyes" "Boo")

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(def users [{:name "John Doe" :subscription 0}
            {:name "Jane Doe" :subscription 1}
            {:name "John Dur" :subscription 1}
            {:name "Sara Der" :subscription 1}])

(defn alphabetic-sort [u1 u2]
  (cond
   (= (:subscription u1)
      (:subscription u2)) (neg? (compare (:name u1)
                                         (:name u2)))

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qsort <- function(inp, cfun) {
  if (length(inp) > 1) {
    cres <- cfun(inp, inp[[length(inp)]])
    c(qsort(inp[cres < 0], cfun), inp[cres == 0], qsort(inp[cres > 0], cfun))
  } else {
    inp
  }
}

users <- list(list(name = "John Doe", subscription = 0),