Print to a specific line on stdout using Python

Question

I would like to print to a specific line on stdout using Python.

Say.. I have a loop within a loop. Currently it prints this :

a0,b0,c0,a1,b1,c1,a2,b2,c2,

But actually I want it to print this :

a0,a1,a2,
b0,b1,b2,
c0,c1,c2,

the code looks something like this

import sys

ar = ['a', 'b', 'c']
for i in ar:
    c = 1
    while c < 4:
        sys.stdout.write('%s%s,' % (i, c))
        c += 1

Is there a way of identify the line ? eg print to line X ?

Or - can I write 3 lines to stdout (using '\n'), then go back and overwrite line 1 ?

note: I don't just want to achieve the above ! I can do that by altering the loop - the question is about identifying different lines of stdout and writing to them, if possible

Thanks

Possible duplicate of passing \n (new line) on stdout throught sys argument — doctorlove
– doctorlove, Commented Feb 10, 2017 at 11:44
@doctorlove Why? It looks like is not passing it as an argument....or am I missing something? He just uses sys for sys.stdout.write.... — fedepad
– fedepad, Commented Feb 10, 2017 at 11:48
@doctorlove I know about new line thanks, it works fine when I use it :) this is about writing to line 'X' not just the next line ('\n') — jowan sebastian
– jowan sebastian, Commented Feb 10, 2017 at 11:49
I was just checking if @jowansebastian was after \n or correct encoding or something else. — doctorlove
– doctorlove, Commented Feb 10, 2017 at 11:54
@hop Understood, but it's quite a good analogy to what I am actually doing with multi-threading. You can consider the outer loops like the separate threads. — jowan sebastian
– jowan sebastian, Commented Feb 10, 2017 at 15:46

jowan sebastian · Accepted Answer · 2017-02-10 17:19:53Z

1

as @hop suggested, the blessings library looks great for this.

For example

from blessings import Terminal

term = Terminal()
with term.location(0, term.height - 1):
    print 'Here is the bottom.'

and in my example, something along the lines of the below works. It does give the output I was looking for.

from blessings import Terminal

term = Terminal()

print '.'
print '.'
print '.'


ar = ['a', 'b', 'c']
x = 1
for i in ar:
    c = 1
    while c < 4:
        with term.location(c*3-3, term.height - (5-x)):
            print str(i)+str(c-1)+','
        c += 1   
    x += 1

gives:

a0,a1,a2,
b0,b1,b2,
c0,c1,c2,

edited Feb 10, 2017 at 17:19

answered Feb 10, 2017 at 16:13

jowan sebastian

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