How do you print out blank lines in python?

Question

I haven't been able to find out anything on this.
I would like to know how to use a function (e.g. clear_screen) that can print out 20 blank lines.
The last line of my program should be a call to clear_screen.

The start of my code is:

def new_line():
    print
def three_lines():
    new_line()
    new_line()
    new_line()
def nine_lines():
    three_lines()
    three_lines()
    three_lines()
print " "
nine_lines()
print " "

The print function works, but not with clear_screen() and that's what I need working.
If anyone can help me or have any suggestions, that would be great, thanks.

check http://stackoverflow.com/questions/4810537/how-to-clear-the-screen-in-python — avasal, Mar 04 '13 at 06:33
@TimPietzcker: [Console](http://effbot.org/zone/console-index.htm) then — dawg, Mar 04 '13 at 06:35
@TimPietzcker: OK then -- the solution is boycott MS until Windows is POSIX >:-) — dawg, Mar 04 '13 at 06:43

score 3 · Answer 1 · answered Mar 04 '13 at 06:33

3

There isn't a single cross-platform way I think. So instead of relying on os.*, the following could work

print("\n"*20)

answered Mar 04 '13 at 06:33

Anirudh Ramanathan

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Thanks! The start of my code is def new_line(): print def three_lines(): new_line() new_line() new_line() def nine_lines(): three_lines() three_lines() three_lines() print " " nine_lines() print " " and the print function wors, but not with def clear_screen(): and that's what I need to work? – user2130691 Mar 04 '13 at 07:46
@user2130691 please add the code to the question. I can't follow without the indents. – Anirudh Ramanathan Mar 04 '13 at 07:54
@Cthulhu I posted what seems to be his code in an update... – pradyunsg Mar 04 '13 at 08:18

score 3 · Answer 2 · edited May 23 '17 at 12:21

Your clear_screen can be

os.system Based

def clear_screen():
    import os
    os.system( [ 'clear', 'cls' ][ os.name == 'nt' ] )

Works on unix and Windows.
Source: Here

Newline-based

def clear_screen():
    print '\n'*19 # print creates it's own newline

As per your comment, it seems your code is

def new_line():
    print
def three_lines():
    new_line()
    new_line()
    new_line()
def nine_lines():
    three_lines()
    three_lines()
    three_lines()
print " "
nine_lines()
print " "

It will work and does,
But Why do you want to have such a long piece of code if print '\n'*8 can do the same?

Speed Test
Even though you don't have a speed restriction, here's some speed stats for 100 runs each

os.system function took 2.49699997902 seconds.
'\n' function took 0.0160000324249 seconds.
Your function took 0.0929999351501 seconds.

You do realize your second 'here' points to the other answer on the same question right? ;) :D — Anirudh Ramanathan, Mar 04 '13 at 06:45
@Cthulhu Yes, actually I was going to post that, but you posted it just before me, so I figured I'll link it to your's. — pradyunsg, Mar 04 '13 at 06:48

How do you print out blank lines in python?

2 Answers2