this post was submitted on 02 Sep 2025
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Python

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Python Mutability (programming.dev)
submitted 2 months ago by bterwijn@programming.dev to c/python@programming.dev
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[–] sukhmel@programming.dev 6 points 2 months ago (3 children)

There's also a gotcha with default parameters:

def fun(a = []):
    a += [1]
    return a

fun()
print(fun()) # [1, 1]

issues I had with the tool you linkedI tried to make a link to this code in this visual debugger, but a link is made broken and can't be used without urlencoding spaces (I guess). Also the tool doesn't produce visual output in DuckDuckGo browser on Android

[–] bterwijn@programming.dev 2 points 2 months ago (2 children)

You can just write your code and then press "Get URL" to get the link: https://memory-graph.com/#code=def+fun%28a+%3D+%5B%5D%29%3A%0A++++a+%2B%3D+%5B1%5D%0A++++return+a%0A%0Afun%28%29%0Aprint%28fun%28%29%29+%23+%5B1%2C+1%5D

DuckDuckGo problem, thanks for reporting.

[–] sukhmel@programming.dev 2 points 2 months ago (1 children)

Yeah, I wrote code and pressed get URL, but then I copied what was shown in the window

The clipboard content:

https://memory-graph.com/#code=+%23+What+is%2Bthe+output+of+this+Python+program%3F%0A+++%0Adef+fun%28a+%3D+%5B%5D%29%3A+%0A++++a+%2B%3D+%5B1%5D%0A++++return+a%0Afun%28%29+print%28fun%28%29%29

The window text:

The following URL has been copied to your clipboard with:

    The current code
    Set breakpoints
    Playback timestep
    Play/Pause state

https://memory-graph.com/#code=+%23+What+is+the+output+of+this+Python+program? +++ def+fun(a+=+[]):+ ++++a++=+[1] ++++return+a fun()+print(fun())

The latter doesn't work, and I didn't think of checking the former

[–] bterwijn@programming.dev 2 points 2 months ago* (last edited 2 months ago)

Thanks for reporting, should be fixed now.