Python: replacing output lines?

Question

I'd like to have a function that replaces a line in the output with another line, e.g.:

from time import sleep
print("Hello")
sleep(5)
replaceLine(1, "World")

this would first put out "Hello", then after 5 seconds replace line 1 (which is the "Hello" one) with the string "World".

Is there any built-in function or module that you can use for this?

Answer 1

print("\33[2J") # clear the screen
print("\33[1A") # move the cursor up one line

# The CSI is '\33[' ;)

Answer 2

You need to use ansi escape code ( or a module to handle them more friendly ^^ ):
- https://en.m.wikipedia.org/wiki/ANSI_escape_code
- https://pypi.python.org/pypi/blessings
- https://pypi.python.org/pypi/colorama

[ edit ]
Unfortunatly, this doesn't work in Sololearn terminal output emulator ^^

Answer 3

"""
You need to write something immediatly after the command to move cursor up, as by default print() function add a new line char ( so cursor move one line down, as he doesnt have move ), or move up 2 lines instead of 1 to anihilate the new line added by the print function ( you can also specify an empty ending char at parameter of the print() function )...
"""

# So:

print("Attempt")
print("\33[1A")

# is equivalent to:

print("Attempt")
print("\33[2A")
print('Test")

Answer 4

@visph - nice answers, using terminal escapes.

Answer 5

@visph works perfectly, thanks!

Answer 6

I want to do it in the console (console application)

Answer 7

@visph I read that wikipedia article, but how do I use those codes in python?

Answer 8

It depends where you want it to do its stuff. In console applications, it might be feasable, on GUI it's relatively easily. In the shell, don't even try, I think it's impossible

Answer 9

Then I don't really know how to do it