I have the following code:
num = int(raw_input("input number: "))
print "\b" * 20
The console output looks like
input number: 10
I'd like to delete the text input number: 10 after the user presses ENTER. The backspace key \b can't do it.
This will work in most unix and windows terminals ... it uses very simple ANSI escape.
num = int(raw_input("input number: "))
print "\033[A \033[A" # ansi escape arrow up then overwrite the line
Please note that on Windows you may need to enable the ANSI support using the following http://www.windowsnetworking.com/kbase/windowstips/windows2000/usertips/miscellaneous/commandinterpreteransisupport.html
"\033[A" string is interpreted by terminal as move the cursor one line up.
import sys
print "Welcome to a humble little screen control demo program"
print ""
# Clear the screen
#screen_code = "\033[2J";
#sys.stdout.write( screen_code )
# Go up to the previous line and then
# clear to the end of line
screen_code = "\033[1A[\033[2K"
sys.stdout.write( screen_code )
a = raw_input( "What a: " )
a = a.strip()
sys.stdout.write( screen_code )
b = raw_input( "What b: " )
b = b.strip()
print "a=[" , a , "]"
print "b=[" , b , "]"
There are control sequences for 'word back' and 'line back' and the like that move the cursor. So, you could try moving the curser back to the start of the text you want to delete, and overriding it with spaces. But this gets complicated very quickly. Thankfully, Python has the standard curses module for "advanced terminal handling".
The only issue with this is that it isn't cross-platform at the moment - that module has never been ported to Windows. So, if you need to support Windows, take a look at the Console module.
curses module would be helpful?
window object by calling curses.initscr(), and get do your I/O using the window methods rather than print and raw_input. Then when you want to delete an entire line, you need to ensure that the cursor is somewhere on that line, and call .deleteln() on the window.You can use os module
import os
os.system('clear')
The "cls" and "clear" are commands which will clear a terminal (ie a DOS prompt, or terminal window).
For IDLE:The best you could do is to scroll the screen down lots of lines, eg:
print "\n" * 100
