Probelm in displaying char. indexwise

Probelm in displaying char. indexwise - Printable Version

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Probelm in displaying char. indexwise - ShailendraRaghunathPhadke - Feb-09-2017

Hi,
I have started python programming. And my question is related to string .

I wrote below statement

msg=  "Welcome"
print(msg)
I got theoutput as "Welcome" :correct

then,
print(msg[1])
I got the output as "e" : correct

then, I wrote
print(msg[1:3])

I got the output as "el" : I don't understand this

W e l c o m e
0 1 2 3 4 5 6

So, I am expecting the output as elc

then, why it is just showing me "el" ?

Please help me here
Thanks

RE: Probelm in displaying char. indexwise - wavic - Feb-09-2017

In [1:3] 3 is like a frame. It's not included in the slice.

RE: Probelm in displaying char. indexwise - buran - Feb-09-2017

Slicing:

some_iterable[start:stop:step]

stop is not included, so [1:3] would start at 1 and up to, but not including 3

RE: Probelm in displaying char. indexwise - sparkz_alot - Feb-09-2017

Basically, with your example:

print(msg[1:3])

you are saying msg[start with this character : up to but not including this character].

A bit confusing when you first start off. Even more so when you use a negative index:

>>> msg[-1]
'e'
>>> msg[-3]
'o'
>>>

but:

>>> msg[-3:-1]
'om'
>>>

RE: Probelm in displaying char. indexwise - ShailendraRaghunathPhadke - Feb-09-2017

(Feb-09-2017, 02:23 PM)buran Wrote: Slicing:
some_iterable[start:stop:step]
stop is not included, so [1:3] would start at 1 and up to, but not including 3

OK Buran I understand your explanation. Thanks for reply.

RE: Probelm in displaying char. indexwise - Ofnuts - Feb-09-2017

(Feb-09-2017, 02:33 PM)ShailendraRaghunathPhadke Wrote:
(Feb-09-2017, 02:23 PM)buran Wrote: Slicing:
some_iterable[start:stop:step]
stop is not included, so [1:3] would start at 1 and up to, but not including 3
OK Buran I understand your explanation. Thanks for reply.

It can be easier to understand if you consider that the indices are really indices between the letters (or list elements)

 W e l c o m e
0 1 2 3 4 5 6 7

So, here, [1:3] brackets 'el'