Question 358769 in Visual Studio Code Question posted in
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Visual Studio Code – Can't print on same line in VS Code notebook,`b` and `r` do not work

I want to print on the same line in a VS Code notebook but it does not work.

b also does not work well, it requires me to use two b as a group to backspace.

I installed the Jupyter Notebook Extension. And I also tried in a Jupyter notebook, it’s the same as in the VS Code notebook with the extension.

This is the code to reproduce the program:

import time


def test_output():
        print('bb bb: OK', end='', flush=True)
        print(' -> Read: OK', end='', flush=True)
        print(' -> Json: OK', end='', flush=True)
        print(' -> Analysing...', end='', flush=True)


for i in range(15):
    print(f'r{" " * 20}r', end="", flush=True)
    time.sleep(1.5)
    print(f"rtest({i:02d}/15): Opening", end="", flush=True)
    time.sleep(1.5)
    test_output()

and this is the output:

test(14/15): OpeningK -> Read: OK -> Json: OK -> Analysing: OK -> Read: OK -> Json: OK -> Analysing: OK -> Read: OK -> Json: OK -> Analysing: OK -> Read: OK -> Json: OK -> Analysing: OK -> Read: OK -> Json: OK -> Analysing: OK -> Read: OK -> Json: OK -> Analysing: OK -> Read: OK -> Json: OK -> Analysing: OK -> Read: OK -> Json: OK -> Analysing: OK -> Read: OK -> Json: OK -> Analysing: OK -> Read: OK -> Json: OK -> Analysing: OK -> Read: OK -> Json: OK -> Analysing: OK -> Read: OK -> Json: OK -> Analysing: OK -> Read: OK -> Json: OK -> Analysing: OK -> Read: OK -> Json: OK -> Analysing: OK -> Read: OK -> Json: OK -> Analysing...

This is the code and output of b not working:

import time


def test_output():
        print('bbb: OK', end='', flush=True)
        print(' -> Read: OK', end='', flush=True)
        print(' -> Json: OK', end='', flush=True)
        print(' -> Analysing...', end='', flush=True)


for i in range(15):
    print(f'r{" " * 20}r', end="", flush=True)
    time.sleep(1.5)
    print(f"rtest({i:02d}/15): Opening", end="", flush=True)
    time.sleep(1.5)
    test_output()

test(14/15): Opening OK -> Read: OK -> Json: OK -> Analysing..: OK -> Read: OK -> Json: OK -> Analysing..: OK -> Read: OK -> Json: OK -> Analysing..: OK -> Read: OK -> Json: OK -> Analysing..: OK -> Read: OK -> Json: OK -> Analysing..: OK -> Read: OK -> Json: OK -> Analysing..: OK -> Read: OK -> Json: OK -> Analysing..: OK -> Read: OK -> Json: OK -> Analysing..: OK -> Read: OK -> Json: OK -> Analysing..: OK -> Read: OK -> Json: OK -> Analysing..: OK -> Read: OK -> Json: OK -> Analysing..: OK -> Read: OK -> Json: OK -> Analysing..: OK -> Read: OK -> Json: OK -> Analysing..: OK -> Read: OK -> Json: OK -> Analysing..: OK -> Read: OK -> Json: OK -> Analysing...

These problemr only occur in a notebook, whether in VS Code or Jupyter notebook. But if I run in the terminal, it will work well.

Tags:

2

Answers


  1. 0

    As mentionned here, the notebook only emulates a terminal; since b is based on the cursor position and notebook do not emulate the cursor position, b is not supported.

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  2. 0

    What is supposed to happen exactly in your demo if it worked like you wanted? You don’t specify.

    Jupyter-based Option

    Since b doesn’t work in Jupyter as others have said:
    This gets close, I think (it’s based on here):

    import time


def test_output():
        print('rr rr: OK', end='r', flush=True)
        print(' -> Read: OK', end='r', flush=True)
        print(' -> Json: OK', end='r', flush=True)
        print(' -> Analysing...', end='r', flush=True)


for i in range(15):
    print(f'r{" " * 20}r', end="", flush=True)
    time.sleep(1.5)
    print(f"rtest({i:02d}/15): Opening", end="r", flush=True)
    time.sleep(1.5)
    test_output()

    I probably needs some adjusting if you say what should happen?

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