'slice()' In Python Is Underrated

Is "slice()" in Python underrated? I personally never had to use it until I started working with Pandas. What I like about it is that it promotes code reusability, even though I find it uncommon to have to repeat the same slice throughout a project.

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[DrDeuteron]

slice is fantastic. I have a complicated space instrument with around 500 channels, and it comes in so fast the electronics can't keep up, so there are 4 separate amplifier chains...which are all identical. but of course they aren't, so each needs to be calibrated separately, The guys were doing it in Matlab with handwritten if chain=='north': idx = [1, 5, ...] else./...repeated everywhere.

So I enlightened them (oh, and it had a time stamp in position 0), so I just made a dictionary of slice object vs amplifier chain (named after the cardinal directions):

AMP = dict(time=slice(0, 1), north=slice(1, None, 4), east=slice(2, None, 4), south=(3, None, 4), west=(4, None, 4))

so a 

calibration = {amp: sensor.data[AMP[amp]].mean() for amp in ('north', 'east', 'south', 'west')}


gave me a dictionary of time stamped calibration sample averages (when the system was in calibration mode). Then you save that and scale environmental data until the next cal measurment 2 seconds later.

`No ifs, no loops. cyclomatic complexity minimized. Nothing is WETT (write everything twice), it's all DRY (don't repeat yourself).

[MFM]

Ya much better example than the short video, now I get the importance of it! Thank you for sharing the awesome tip.

[Sinke_]

your setdefault video was quite usefull, I wouldn't say this is so much, but it's good to know might come in handy perhaps. Its nice to know small tools like this

[anubis]

Honestly, I've never had to do this either, but if I ever had to, I would just use a variable to control it.

x = 3
print(text[x:])
print(text[x:])

[cristobaljvp]

It looks useful, I love to know that it exists. But as you said I have never really needed it haha Thanks for the video!

[RedHair]

If you're going to write a full expression as a slice, this is definitely useful.

[ProfRoxas]

I like that you changed the example to this one since the short.
Personally i never used the slices, but it does look useful in certain cases, like comparing the first/last n character of a string with each other for some reason.
One usecase can be like passing the slice to a function, or make it a variable so you can change it inside a class

There are way too many tricks in python to like ever run out of content or ever feel like one knows everything that the language can offer.

[paulnigelressurrecion]

Praised to you bro, you taught as easy the way you taught a python

[phizc]

2:17 The None isn't representing the colon, the comma is representing the colon.

E.g.
slice(None, None) is equivalent to [:], not [::]

[mpb]

by putting variables into the string slicing brackets, doesn't this give the same functionality as using slice()?? and then just update the variables??

text: str = 'I am a teapot'
text2: str = 'I am not a teapot'

a = 3
b = 10

print(text[a:b])
print(text2[a:b])


a = 5
b = 8

print(text[a:b])
print(text2[a:b])

[apmcd]

The only use case I can think of is having a text file with fixed-width fields. Using named slices to identify each field may make the code more readable, especially if there is no need to separate the line into its various fields.

[korntut]

I needed this or something like this years ago when I was just getting started. I wonder if I could still use it or if I'd just approach the problem completely differently now

[yasink]

Could you please make a series on DSA..

[mukkum]

You are awesome!
Mukesh Kumar (Indian)

[xzex]

is it make a shallow copy of the original object ? did anyone test that ?

[zachcheung]

I'd be interested if this is compatible with other libraries that use slicing quite heavily such as numpy and pandas.

[yasinsk]

Sir please give a full topic video on class and objects
I am having a exam to join a company, it would help me a lot
Please 🙏🙏

[Sinke_]

In short you said in pandas you really had to use it, you could have gived example where it's really nessesary

[dragonbone]

I mean...
Cannot we just do this instead?
text = "I am a teapot"
text2 = "I am not a Teapot"

slice_str = "[3:10]"
parsed_slice = slice(*map(int, slice_str[1:-1].split(":")))

result1 = text[parsed_slice]
result2 = text2[parsed_slice]

print(result1)
print(result2)