Accessing string
String is a one of the datatype enclosed in asingle /double quotes.string is immutable we access string using two methods called indexing and slicing.
In Indexing we can access single element/charecter.index starts from 0 .python engine always goes left to right
Ex of Indexing :a=”samanvitha” a[0]/a[5] o/p:s,v
In Slicing we can access sequencec of elements at once.three ways of slicing possitive,negative,mixed slicing.
syntax:vatiable/string[startingindex:endingindex:stepsize]
by default empty starting index takes first position called 0 & ending index takes end of the string.ending index value ignored.
Stepsize means which element/charecter wants to print next 1 or 2 based on stepsize prints. returns empty string if nothing return in output
Possitive Slicing:Python Engine always goes left to right.
Ex of slicing:a=”samanvitha”
a[::] o/p: samanvitha
a[0::]o/p: samanvitha
Get Samanvitha’s stories in your inbox
Join Medium for free to get updates from this writer.
a[1:5:] o/p: aman
a[1:5:1]o/p: aman
a[0:5:2]o/p: aa
Negative Slicing:Python engine goes from right to left .it return reverse of a string.negative slicing starts from -1
ex:a=”samanvitha”
a[-1::-1]o/p:ahtivnamas
a[-5::-1] o/p:vnamas
a[-5:-10:-1] o/p:vnama
Mixed slicing:combination of possitive and negatibe index.
ex: a=”samanvitha”
a[-5:-10:1] o/p: ’’empty string
a[-1:-6:1] o/p:’’empty string
