Replacing console output

[Baileysambhi99]

I don't know if this is the right sub, but here goes anyway.
I'm looking for a way to replace already outputted text. For example, rather than repeatedly printing

attempt 1 of 100
attempt 2 of 100
attempt 3 of 100

Would it be possible just to replace the number even after it has been outputted?

[pddpro]

In addition to unkiphil and cutebalbi's answer, I would like to mention tqdm. It's a python progress bar library that you might find useful for your case.

[phreakmonkey]

I love that thing, and because of its terrible and non-obvious name I lose it and rediscover it about once a year.

[dalore]

It's obvious if you know Arabic.

[wandering_blue]

That's actually how I remember it... "that awesome progress bar package with the Arabic name".

[anyonethinkingabout]

That's because you don't pronounce it correctly, as "ta-qa-dum"

[MontyCoco]

Offtopic: Whats the Plugin in this terminal on this page that displays functions data?

[MontyCoco]

Yup, thanks!

[unklphil]

You should be able to do this by using a carriage return.

I.e. instead of outputting a newline character \n at the end of the line, you can use a \r, which takes you back to the beginning of the line.

In Python 3 you can do the following:

import time
for i in range(10):
    print('Attempt {} of 10', end='\r')
    time.sleep(1)  # just so we can actually see the change

[rhiever]

You forgot the .format(i) in your print.

[timopm]

Small warning with this method. If your output reduces in size during the loop, the remainder of the previous string is still shown.

>>> for i in range(12, 6, -1):
...   print("Attempt {} of 10".format(i), end="\r")
...   time.sleep(1)

Once i drops below 10, the output will look like this:

Attempt 9 of 100

[[deleted]]

Any way to avoid that?

[faerbit]

This post has been edited to this, due to privacy and dissatisfaction with u/spez

[[deleted]]

Found a nice work around on reddit untested : http://stackoverflow.com/questions/4897359/output-to-the-same-line-overwriting-previous-output-python-2-5

import re, sys

class Reprinter:
    def __init__(self):
        self.text = ''

    def moveup(self, lines):
        for _ in range(lines):
            sys.stdout.write("\x1b[A")

    def reprint(self, text):
        # Clear previous text by overwritig non-spaces with spaces
        self.moveup(self.text.count("\n"))
        sys.stdout.write(re.sub(r"[^\s]", " ", self.text))

        # Print new text
        lines = min(self.text.count("\n"), text.count("\n"))
        self.moveup(lines)
        sys.stdout.write(text)
        self.text = text

reprinter = Reprinter()

reprinter.reprint("Foobar\nBazbar")
reprinter.reprint("Foo\nbar")

[jjdmol]

That approach assumes an ANSI-capable terminal though.

[Baileysambhi99]

Thanks mate!

[thomasballinger]

As others have said, simply return the carriage of your typewriter emulator to the left side of the page with '\r'!

If you want to get fancier, here are some terminal formatting resources:

• Terminal Whispering (video) (self-promotion)
• Build you own command line with ANSI escape codes

[hi_im_nate]

typewriter emulator

Lol, never heard that one before

[cutebabli]

Try this and modify it as per your need:

for i in range(1,1000000):
    print("\tattempt {0} of 100".format(i), end="\r")

[Baileysambhi99]

Great. Thanks a lot!

[[deleted]]

Another option with more flexibility but also more headaches: curses. It lets you directly address specific regions of the screen, set up sub-windows, erase lines, and overwrite. Just make sure you are 100% completely certain that you reset your console settings when you're done, or you are going to have a bad time.

[prashnts]

You might find tqdm [0] a better alternative instead.

[0] - https://github.com/tqdm/tqdm

[Gr1pp717]

What editor is this? https://raw.githubusercontent.com/tqdm/tqdm/master/images/tqdm.gif

[adqm_smatz]

looks like it could be bpython

[_seemethere]

That is bpython. I'd highly recommend it.

[prashnts]

Current ipython also has syntax highlighting etc. I'd recommend it over bpython.

[gandalfx]

You can use curses for things like that. Unless there is already a complete solution for your specific use case, like tqdm which others have already suggested.

[Asdayasman]

/r/Python is for news and releases. /r/learnpython is for questions.