Reading character from keyboard

[Tommy Grav]

A very simple question. I would like to read a single character from the
keyboard (y or n). I have tried to look in my Python books and a google
search, but have come up empty. I am sure the info s out there, but I
guess I am unable to find the right question or search keyword :o/

Any hints or help appreciated
Cheers
Tommy

[draghuram@gmail.com]

Re: Reading character from keyboard


Tommy Grav wrote:

A very simple question. I would like to read a single character from the
keyboard (y or n). I have tried to look in my Python books and a google
search, but have come up empty. I am sure the info s out there, but I
guess I am unable to find the right question or search keyword :o/

You can use "raw_input" .

http://docs.python.org/lib/built-in-funcs.html

If you are looking for a function to ask the user for confirmation, you
can use something like this:

-----------------------------------
def confirm(_prompt =None, _default=False) :
"""prompts for yes or no response. Return True for yes and False
for no."""
promptstr = _prompt
if (not promptstr):
promptstr = "Confirm"

if (_default):
prompt = "%s [%s]|%s: " % (promptstr, "y", "n")
else:
prompt = "%s [%s]|%s: " % (promptstr, "n", "y")

while (True):
ans = raw_input(promp t)
if (not ans):
return _default
if ((ans != "y") and (ans != "Y") and (ans != "n") and (ans !=
"N")):
print "please enter again y or n."
continue
if ((ans == "y") or (ans == "Y")):
return True
if ((ans == "n") or (ans == "N")):
return False
--------------------------------------------

Usage:

if (confirm("\nWan t to proceed?", _default=False) ):
# proceed

------------------------------------------------

[consmash@gmail.com]

Re: Reading character from keyboard


Tommy Grav napisal(a):

A very simple question. I would like to read a single character from the
keyboard (y or n). I have tried to look in my Python books and a google
search, but have come up empty. I am sure the info s out there, but I
guess I am unable to find the right question or search keyword :o/
>
Any hints or help appreciated
Cheers
Tommy

Actually, if you want to read only one character from keyboard, you
will need to use terminal operations rather than plain input stream.
Unfortunately this is rather not portable solution. For Windows you
have to import msvcrt, on Unices curses module. The latter code is
quite similar. Example:

import msvcrt

def prompt(msg='You r choice: ', options={'y': True, 'n': False}):
while True:
print msg
key = msvcrt.getch()
choice = str(key).lower( )
if options.has_key (choice):
break
print 'You entered wrong key! Enter again.'
return options[choice]

print prompt() and 'Good for you.' or 'Bad Luck.'

[Gabriel Genellina]

Re: Reading character from keyboard

At Tuesday 23/1/2007 15:28, consmash@gmail. com wrote:

A very simple question. I would like to read a single character from the
keyboard (y or n). I have tried to look in my Python books and a google

>
>Actually, if you want to read only one character from keyboard, you
>will need to use terminal operations rather than plain input stream.
>Unfortunatel y this is rather not portable solution. For Windows you
>have to import msvcrt, on Unices curses module. The latter code is

There is a portable getch implementation, search the Python Cookbook.


--
Gabriel Genellina
Softlab SRL






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