sys.stdout.write not working as expected in Python

Question

I have two functions prints() and clear(). The function prints() print lines of text and the function clear() delete the printed lines with this method:

def clear():
    i = 0
    while True:
        if(i > globals['l']):
            break
        else:
            sys.stdout.write("\033[F \033[K")
            i += 1

where globals['l'] is the number of lines to clear.

Then after the function clear() runs and the lines are cleared, the function prints() run again etc...

I don't understand why the function clear() is clearing only 22 lines of 32 lines. But if I have, for example, 19 lines it is working perfectly. Where is the problem? How can I fix this?

As an aside, this could be a one-liner: says.stdout.write("\033[F \033[K" * l) — tdelaney
– tdelaney, Commented Jan 6, 2017 at 17:36

gukoff · Accepted Answer · 2017-01-06 18:06:50Z

2

Try this:

def clear(line_count):
    sys.stdout.write("\033[F \033[K" * line_count)
    sys.stdout.flush()

answered Jan 6, 2017 at 18:06

gukoff

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Comments

Alban · Accepted Answer · 2017-01-23 10:56:55Z

0

EDIT: Works only on Unix systems

You can use:

print("\033c")

Or:

import subprocess
subprocess.call(["printf", "\033c"])

edited Jan 23, 2017 at 10:56

answered Jan 15, 2017 at 23:00

Alban

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1 Comment

Alban Over a year ago

it works only on Unix systems, I tried several alternatives for windows, but I haven't found the solution

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