Python Tutorial for Beginners 8 - Python Slices or Slicing

In this video I am going to show How to use Slice function or slicing with Python Collections. Also I am going to show how to use Negative index with Python Collections. So What is Python Slice? A slize is a span of items that are taken from a sequence
List slicing format: list[start : end: step]. Span is a list containing copies of elements from start up to, but not including, end
If start not specified, 0 is used for start index. If end not specified, len(list) is used for end index. Slicing expressions can include a step value and negative indexes relative to end of list.
And What is Negative Indexing In Python: I a Python Collection such as Lists, Strings, Tuples, Bytes .. we can refer to an element by a negative index representing how far it is from the end.
example
# +---+---+---+---+---+---+
# | P | y | t | h | o | n |
# +---+---+---+---+---+---+
# 0 1 2 3 4 5 ---- Positive Index
# -6 -5 -4 -3 -2 -1 ---- Negative Index

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[samcs]

Hats off to "ProgrammingKnowledge". You have done a great job. You made the programming piece of cake for beginners and boost their confidence in learning programming. I have watched and learnt programming by watching your videos. They are great. :-)

[rudramishra]

You are the best programmer as well as programming teacher.

[pravinbaste]

Thanks bro..!!!
You are doing really awesome work...!!
Learned a lot from your videos..!!!

[fathimajesrin]

its useful to us till now .... love it

[vivekpannu]

for better experience, efficiency and speed watch at 2 times the original speed and i believe most of you will be able to withstand but for those of you who can't take this speed (assuming it's fast which it isn't) after some time(2 minutes) slow down to 1.5 and that will be easily understandable

[LtMewS]

this is more like using terminal in linux than programming nice tutorial u explain so much i really appreciate for it

[sofiachildress]

thank you formaking these! they are such a great :)

[SinghTheSoftware]

i think in case of [-4:-2]it will first goes to -4 from the end and then print diff of given no value i.e(in this case it will print 2 values as 4-2=2 )starting from -4 value.

[sunildingankar]

While using my list [0: :3], it doesn't skip, but it prints the 3rd value. It skips 2 values and print 3rd. Your videos are too helpful in understanding python. Thank you so much.

[RajashekarNarayana]

Guruji, thanks for your videos, its really helping me a lot although I am not a techie

[wesleysimpson]

Thank you for these videos. I've learned so much

[shankarsalesforceseries]

Hi, very good tutorial. Thank you.
I have tried this also mylist[ : : 0] will give us error since slice step cannot be zero.
And I will keep watching your video. Really helpful.

[saurabhbhathiza]

sir, can u please explain the concept of 6:54, i am not able to get that.

[brgarrison]

on the slicing on the mylist[] wanting to show 5 thru 9 .. you suggested using why not use mylist[5:]
It shows the same output.

[thuyvuong]

At 6:56 in the video myList [-4:-2], why does it not print 8 and skips to print 7, but then it goes back and prints out 6 and doesn't print 7 again instead. Because it seems that it skipped -2 first to print 7, but it doesn't skip -4 and prints 6?

Does anyone have an explanation for this?

[rafaeljuca]

4:56 it didnt skip the 3rd value. C is the third value and it was printed.

[rafaeljuca]

you are making some confusion my friend with numbers and idexes. In the first example, for instance, [4:8] 4 here correspond to the fourth position which is number 3..for some reazon it skipes the first index number asked and prints the next one in this case number 4 corresponding to the 5th index position and it goes until the 8th position in which displays the number 7. when You've created by the next mylist index [5:10] this 10 does not reffer to the number 10 that might come after the number 9 on the list but 10 here is the 10th position that belongs to list number 9. number 0 holds the 1st position.

[professordd]

not sure if I missed this part but what if you want to list all but exclude 1 slice.

[rajkumarkushwaha]

it is not necessary to print till end we need to give mylist[4:10]
even we give mylist[4:29], it will give same answer.
my way seems to be rude but i am simply identifying different ways and bluntly typing is down

[neerajn]

Great job ProgrammingKnowledge!!
I think I found a minor bug in Python related to this lesson.
When you print(mylist[9:11]), it prints 9, however names[11] is out of range. I was hoping for an error but it didn't throw any. If I try to explicitly print(mylist[11]), it does throw an error !!