Introduction to string manipulation in Python
In Python, a string is specified using single or double quotation marks and is defined as a series of characters. String manipulation is the process of manipulating strings by techniques such as slicing, parsing, and analysing. In several computer languages, including Python, a string data type is available for manipulating strings using the various string operations offered by the “str” string data type. In Python, the string data type is used to represent textual data, and it is utilised in all string-related applications. In this post, we will explore the different string functions used in string manipulation. We will learn about Python string manipulation in this section.
Operating of Python string manipulation
In Python, string class “str” offers different methods for manipulating strings, and almost every application utilises string. In Python, strings are stated using either single or double quotes, as opposed to other programming languages that need data types for string declaration. Certain built-in string functions in Python are used for string manipulation. In Python, there are operators, functions, and methods for manipulating strings. Let us examine each item in the section below.
The string manipulation operators
Let’s begin by using a few string operators for string manipulation.
1. * operator
This operator is used when many copies of a particular string must be created. Consider the following illustration to illustrate this operator.
star_op = "educba "
res = star_op * 4
In the programme above, the string “educba” has been defined using the “star op” variable and the “*” operator. The “res” variable will contain the output of the expression “res * 4” which will print the provided string “educba” four times.
2. + operator
The Python + operator can be used to concatenate the given strings, as shown in the example below.
str1 = "Educba "
str2 = "Training "
str3 = "Institute"
res = str1 + str2 + str3
In the aforementioned programme, the “+” operator is used to concatenate the supplied string, and the result is shown as seen in the screenshot. Similar to how there are several operators for manipulating strings, such as “in”, “not”, etc.
Today we will examine a few string manipulation methods that are built into Python. Let’s examine several string built-in functions in the part that follows. There are several functions, including chr(), len(), str(), and ord ().
Let’s show these functions by providing an example for each.
print("Python program for demonstrating string built-in function for string manipulation")
str1 = "E"
str2 = 35
str3 = "Educba Training Institute"
res1 = ord(str1)
res2 = chr(str2)
res3 = len(str3)
print("This str() function is used for returning a string representation of an object")
print("The ord() function is used for converting given character to an integer")
print("The chr() function is used for converting given integer to character")
print("The len() function is used to get the length of a given string")
In the above application, four distinct string built-in functions are utilised to show string manipulation utilising various string methods. In the above code, the str() function returns the object passed to it in string representation, the ord() function returns the integer representation of the given character, the chr() function returns the character representation of the integer passed to the function, and the len() function returns the number of characters in the string passed as an argument.
String indexing is another method for manipulating strings in Python. When a string consists of a collection of characters, the indexing technique must be used to obtain the requested character using the index or key values. In the part that follows, we will provide a specific example.
Say we define a string and assign an index value to each of its characters.
str_indx = "Educba"
print("The character of the specified index of 2 of the given string is as follows")
In the above code, we can see that the string “Educba” has been declared, with the indices E = 0, d = 1, u = 2, c = 3, b = 4, and a = 5. Here, we are requesting to print the character with index 2, “u.”
String slicing is another string manipulation technique. String slicing in Python is described as the extraction of a substring from a given string, where Python has an indexing technique that aids in string slicing. String slicing employs the form s[a:b], where “a” is the start index and “b” is the end index, to return the string from index “a” to index “b.” This will be shown in the following example.
str_indx = "Educba"
print("The given string is sliced to obtain substring is as follows")
print(str_indx[2 : 5])
In the above code, we can see that the string “Educba” was defined, and we are attempting to extract a substring or portion of the text using the stated indexes for each character. We have stated in the programme to extract string str indx[2:5], resulting in the “ucb” substring. Hence, we will extract characters from index 2 to index 5 to create the substring seen in the picture above.
This article concludes that string manipulation in Python is the process of manipulating strings using operations such as parsing, slicing, and indexing. This article demonstrated how to manipulate strings using Python’s string operators, functions, and methods. Thus, instances of string operators, string functions, and string methods are uncommon. The basics of string indexing and string slicing were also presented with examples for string manipulation.