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How To Index and Slice Strings in Python?

  • Last Updated : 24 Jul, 2020

The Python string data type is a sequence made up of one or more individual characters that could consist of letters, numbers, whitespace characters, or symbols. As the string is a sequence, it can be accessed in the same ways that other sequence-based data types are, through indexing and slicing.

Indexing

Indexing means referring to an element of an iterable by its position within the iterable. Each of a string’s characters corresponds to an index number and each character can be accessed using their index number.

We can access characters in a String in Two ways :

  1. Accessing Characters by Positive Index Number
  2. Accessing Characters by Negative Index Number

1. Accessing Characters by Positive Index Number:
In this type of Indexing, we pass a Positive index(which we want to access) in square brackets. The index number start from index number 0 (which denotes the first character of a string).

Indexing in Python


Example 1 (Positive Indexing) :




# declaring the string
str = "Geeks for Geeks !"
  
# accessing the character of str at 0th index
print(str[0])
  
# accessing the character of str at 6th index
print(str[6])
  
# accessing the character of str at 10th index
print(str[10])

Output :

G
f
G

2. Accessing Characters by Negative Index Number :
In this type of Indexing, we pass the Negative index(which we want to access) in square brackets. Here the index number starts from index number -1 (which denotes the last character of a string).
Example 2 (Negative Indexing) :




# declaring the string
str = "Geeks for Geeks !"
  
# accessing the character of str at last index
print(str[-1])
  
# accessing the character of str at 5th index from the last
print(str[-5])
  
# accessing the character of str at 10th index from the last
print(str[-10])

Output :

!
e
f

Slicing

Slicing in Python is a feature that enables accessing parts of sequence. In slicing string, we create a substring, which is essentially a string that exists within another string. We use slicing when we require a part of string and not the complete string.
Syntax :

string[start : end : step]
start : We provide the starting index.
end : We provide the end index(this is not included in substring).
step : It is an optional argument that determines the increment between each index for slicing.

Example 1 :




# declaring the string
str ="Geeks for Geeks !"
  
# slicing using indexing sequence 
print(str[: 3]) 
print(str[1 : 5 : 2]) 
print(str[-1 : -12 : -2])

Output :

Gee
ek
!ke o

Example 2 :




# declaring the string
str ="Geeks for Geeks !"
  
print("Original String :-")
print(str)
  
# reversing the string using slicing
print("Reverse String :-"
print(str[: : -1]) 

Output :

Original String :-
Geeks for Geeks!
Reverse String :-
!skeeG rof skeeG


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