input password with astrix

Question

I want to read char one by one and show to astrix *. Characters can be showed as *, but I cannot exit by pushing Enter.

This is my code:

import sys, tty, termios

def getch():
    fd = sys.stdin.fileno()
    old_settings = termios.tcgetattr(fd)
    try:
        tty.setraw(sys.stdin.fileno())
        ch = sys.stdin.read(1)
        sys.stdout.write('*')
    except:
        print "ex"
    finally:
        termios.tcsetattr(fd, termios.TCSADRAIN,old_settings)
    return ch

If I input Enter where ch = sys.stdin.read(1), what is the return value?

https://stackoverflow.com/a/9202236/4737952 – Ashish Acharya Jul 18 '18 at 07:45 — Ashish Acharya, Jul 18 '18 at 07:45

Oleh Rybalchenko · Accepted Answer · 2018-07-18T08:10:47.197

0

You can use getpass.getpass to prompt a user for a password. But note that getpass module does not show asterisks for unix password prompts.

As for the second part of the question - sys.stdin.read(1) returns \n or \r for Enter input, it depends on a terminal you're using.

And, finally, I made an example how to use your function to read until CR or LF:

while True:', '\n']: break
    ch = getch()
    if ch in ['\r', '\n']: break
    sys.stdout.flush()

If you really need to show asterisks even for unix, that's the way.

edited Jul 18 '18 at 08:10

answered Jul 18 '18 at 07:50

Oleh Rybalchenko

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OMG! This is exactly what I want to do! Thank you so much! :) – SoosanShin Jul 19 '18 at 01:45

score 0 · Answer 2 · answered Jul 18 '18 at 08:02

0

In order to read passwords from the user more securely, check out getpass module.

It can be simply imported and used like shown below. But keep in mind that it doesn't show asterik.

import getpass

password = getpass.getpass('Your message')

Return value of sys.stdin.read(1) is entirely depending on the console you are using.

answered Jul 18 '18 at 08:02

Sreeram TP

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Thank you for answering! – SoosanShin Jul 19 '18 at 01:44

input password with astrix

2 Answers2