Easy way to update text in terminal (instead of printing more text)?

[greatpet]

I would like to show progress of a for loop, updating the text like like “1/100”, “2/200”, until “100/100”. The rest of the program, before or after the loop, would print text in the usual way without changing old text. How should I do this?

[stevengj]

See GitHub - timholy/ProgressMeter.jl: Progress meter for long-running computations

[stevengj]

In particular, this is done with ANSI escape sequences, as in this example

[rafael.guerra]

Linking here one example of ANSI escape sequence suggested by Steve.

And sample code here below for easier reference:

for n in 1:100
    print("Iteration number $n/100\u001b[1000D")
    sleep(0.002)  # to simulate code waiting time
end

[rafael.guerra]

There is also the simple print("\r") solution:

for i in 1:100
    print("\rIteration: $(i)/100")
    sleep(0.002)  # to simulate code waiting time
end

[e3c6]

@rafael.guerra

for i in 1:100
    print("\rIteration: $(i)/100")
    sleep(0.002)  # to simulate code waiting time
end

Unfortunately this seems not to work in Jupyter notebooks in vscode, it just prints a bunch of lines.

Any suggestions?

[stevengj]

@e3c6

Unfortunately this seems not to work in Jupyter notebooks in vscode

Works for me:

(vscode 1.87.0 on Mac.) vscode had an issue with ANSI escapes at one point, but it was supposedly fixed years ago (vscode#112178).

[e3c6]

That’s strange. For me it definitely prints new lines. Note that there are still open issues, which I think might be related to this, e.g.: Which terminal control/escape sequences need to be supported? · Issue #271 · timholy/ProgressMeter.jl · GitHub, and Notebook output must support more ANSI sequences · Issue #118833 · microsoft/vscode · GitHub.

I have no clue what setting might be make things different for me. I also have vscode 1.87 on Mac.