!7

sS youtubeURL = "https://www.youtube.com/watch?v=6vqLqoy6EO4";

p {
  File script = programFile("downloader.py");
  File out = programFile("comments.txt");
  saveTextFile(script, unixLineBreaks(loadSnippet(#1013723)));
  makeExecutable(script);
  S cmd = (isWindows() ? "c:\\python27\\python " : "") + platformQuote(script);
  
  for (int retry = 0; ; retry++) {
    if (retry >= 3) fail("Couldn't install modules");
    
    S stdout = loadTextFile(backtickToConsole(cmd + " --youtubeid " + extractYoutubeID(youtubeURL) + " --output " + platformQuote(out)));
    S missingModule = regexpFirstGroupOneOf(
      ll("ImportError: No module named ([a-z0-9]+)",
        "ImportError: ([a-z0-9]+) does not seem to be installed"), stdout);
    if (missingModule != null)
      backtickToConsole("c:\\python27\\scripts\\pip install " + missingModule);
    else
      break;
  }
  
  pnlStruct(map jsonDecode(linesFromFile(out)));
}

Should work out of the box on Windows if Python 2.7 is in c:\python27.

For Linux: Get Python and say: sudo -H pip2 install requests lxml cssselect