stdin est l'entrée standard et par défaut, ce devrait être votre clavier. stdout est la sortie standard et serait normalement votre moniteur (console). Si vous faites print("Hello World"), ça va vers stdout, qui serait la console actuelle. En tant que débutant, vous n'avez pas besoin d'en faire beaucoup avec ça, mais c'est toujours bon de comprendre.

rule of thumb : use the highest level api/abstraction available. this practice of trying your hardest to be clever / pretentious without a clear need to be .. pretentious. it's exactly like using dunder methods directly. .. while unnecessary .. makes the code harder to read. while this isn't the most relevant example of this ..trend.. you should try your best to make your code ..more accessible. you can't expect everybody to be aware or have the required knowledge about what a buffer is or how is implemented in this case or why ..etc. while stdin is common knowledge .. others might not be. this is more about the ..trend rather than this specific thing. and unless you have a strict use case where it's clearly beneficial.. avoid at all costs.

When you run your Python program, sys.stdin is the file object connected to standard input (STDIN), sys.stdout is the file object for standard output (STDOUT), and sys.stderr is the file object for standard error (STDERR).

Anywhere in the documentation you see references to standard input, standard output, or standard error, it is referring to these file handles. You can access them directly (sys.stdout.write(...), sys.stdin.read() etc.) or use convenience functions that use these streams, like input() and print().

For the Spotify puzzle, the easiest way to read the input would be something like this:

import sys
data = sys.stdin.read()

After these two lines the input for your program is now in the str data.

There's a few ways to do it.

• sys.stdin is a file-like object on which you can call functions read or readlines if you want to read everything or you want to read everything and split it by newline automatically. (You need to import sys for this to work.)

• If you want to prompt the user for input, you can use raw_input in Python 2.X, and just input in Python 3.

• If you actually just want to read command-line options, you can access them via the sys.argv list.

You will probably find this Wikibook article on I/O in Python to be a useful reference as well.

That sounds roughly correct, however input() also takes as an argument a string to use as a prompt, while sys.stdin.read() takes the length to read into the user-entered string as an optional argument instead (and provides no prompt - in the video, a print() was provided to serve as a prompt instead). For more information on what these functions are doing though, you can use help(sys.stdin.read) and help(input) while in a Python interpreter, or visit https://docs.python.org/2/library/sys.html for more information about the sys library and its methods, including stdin. As for your other question, we have to import the sys library because sys.stdin.read() is reflecting a method that exists only in that library. The reason it's so long is that we just imported the library, so we have to reference sys at the beginning of any function from that library, then .stdin() is a function with a .read() method available in it (among others) - so it wouldn't make sense to just say read() without telling Python which read() method you're asking it to use (other functions, including one you write yourself, could include their own read() methods). If you mean to say why sys is a library instead of being ready for use in Python all the time, that's likely because it would be inefficient for Python to keep libraries loaded if they aren't being used, so the library is kept optional.