Python newline after input n characters

Question

I need to create a script that read the user input, but after n characters python create a newline.

Example:

The user input the follow, after 'H','0' and '1' the script create e newline and start to read the input again.

ABCDEFGH

12345670

HIJKLMN1

8900000

I don't want the user to press "Enter" after 'H" or after the 8th character, instead python will put the cursor in a newline.

use `Select` module for unix/linux and `msvcrt` module for windows to read stdin. Also there is an portable implementation here https://repolinux.wordpress.com/2012/10/09/non-blocking-read-from-stdin-in-python/ — saurabh baid, Mar 02 '17 at 03:54

score 2 · Accepted Answer · edited May 23 '17 at 12:09

You can detect a key press and if that char is G 7 or N you can add a new line "\n"

You can check out this thread to see how you can detect keypresses.

Polling the keyboard (detect a keypress) in python

check out the bottom answer, it includes a package for easily detecting presses

Update

You will ned to use some keypress detection or something instead of while loop to do this "on the fly", but I think this will get you started;

(though this is working, while() is only there to show where onpress or what you come up with should be, can be removed and script works fine)

import sys
#you need to change while() with on_press from a click listener or something
        while(True):
            bytes = sys.stdin.read() #reads "string"
            size_of_stdin = len(bytes) #reads string length
                if size_of_stdin > 7: ## size greater than 7 print;
                    print "You won!!" # prints
                    print "\n\n" # newlines

Reason you need to detect keypresses is that you have to "execute" the script manually now.

As in enter some text

1234567 (press enter)

then ctrl+z and enter again. (just to make it harder :p)

Then it looks like this in your terminal

1234567

^Z

You won!!

Hope you figure it out, let me know if anything is unclear or if you don't find a way to detect presses and execute on after 7 presses.

I don't know what character will be the last. So this approach don't suit to me. But thanks anyway, I update my question. — Joao Vitorino, Mar 02 '17 at 18:16
@JoaoVitorino Updated my answer now, let me know what you end up with — Kristian Martinsen, Mar 03 '17 at 11:29

Python newline after input n characters

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