Question

Explain string operators in python with suitable examples.

Answer 1

String Operators:

Python provides the following operators for string operations. These operators are useful to manipulate strings.

(i) Concatenation (+):

The joining of two or more strings is called Concatenation. The plus (+) operator is used to concatenate strings in python.

Example:
>>> “welcome” + “Python”
‘welcomePython’

(ii) Append (+=):

Adding more strings at the end of an existing string is known as append. The operator += is used to append a new string with an existing string.

Example:
>>> str1 =”Welcome to ”
>>> str1+=”Leam Python”
>>> print (str1)
Welcome to Learn Python

(iii) Repeating (*):

The multiplication operator (*) is used to display a string multiple times.

Example:
>>> str1 =”Welcome”
>>> print (str1*4)
Welcome Welcome Welcome Welcome

(iv) String slicing:

A slice is a substring of the main string. A substring can be taken from the original string by using [ ] operator and index or subscript values. Thus, [ ] is also known as the slicing operator. Using the slice operator, you have to slice one or more substrings from the main string.
The general format of slice operation:
str[start: end]
Where start is the beginning index and end is the last index value of a character in the string. Python takes the end value less than one from the actual index specified. For example, if you want to slice the first 4 characters from a string, you have to specify it as 0 to 5. Because python considers only the end value as n – 1.

Example:
(i) slice a single character from a string
>>> str1=”THIRUKKURAL ”
>>> print (str1 [0])
T.

(v) Stride when slicing string

When the slicing operation, you can specify a third argument as the stride, which refers to the number of characters to move forward after the first character is retrieved from the string. The default value of stride is 1.

Example:
>>> str1= “Welcome to learn Python”
>>> print (str1 [10:16])
learn