How to Get a Substring of a String in Python

python substring

What Is a Substring in Python?

A substring in Python is a sequence of characters within a larger string.

Python offers various methods for finding and manipulating substrings in strings. The most commonly used method is slicing, which allows users to access specific pieces of data from within a larger string. 

The ability to access Python Substring gives programmers greater control over their code and enables them to more efficiently manipulate data stored within strings.

How to Create a Substring?

In most programming languages, you can create a substring by using string slicing or substring functions.

String slicing is a way to extract a portion of a string by specifying the starting and ending indices. The syntax for string slicing may vary depending on the programming language, but the general idea is the same. Here’s an example in Python:

s = "Hello, world!"

substring = s[0:5] # extracts the first five characters "Hello"

In this example, the string s is sliced using the indices 0 and 5, which extracts the first five characters. The result is assigned to the variable substring.

Some programming languages also have built-in substring functions that make it easier to extract substrings. Here’s an example in JavaScript:

let s = "Hello, world!";

let substring = s.substring(0, 5); // extracts the first five characters "Hello"

In this example, the substring function is used to extract the first five characters of the string s. The starting index is 0, and the ending index is 5 (excluding the character at index 5).

Note that the exact syntax and behavior of substring functions may vary depending on the programming language and the specific implementation.

If a Substring is found, how do you check it?

To check if a substring is found within a string, you can use the in keyword in Python.

Here is an example:

my_string = "Hello, World!"

substring = "World"

if substring in my_string:

  print("Substring found!")


  print("Substring not found.")

The output will read “Substring discovered!” because the substring is in the string.

You can also use the find() method to check if a substring is found within a string. The find() method returns the index of the first occurrence of the substring in the string, or -1 if the substring is not found.

Here is an example:

my_string = "Hello, World!"

substring = "World"

if my_string.find(substring) != -1:

  print("Substring found!")


  print("Substring not found.")

In this example, the find() method is used to check if the substring “World” is found within the string “Hello, World!”. Since the substring is present in the string, the output will be “Substring found!”.

Substrings from a String Using List Slicing

In Python, you can use list slicing to extract a substring from a given string. Here’s an example:

string = "Hello, World!"

substring = string[7:12]


This code will output "World" as the substring.

In the example above, string[7:12] is a slice that extracts the characters starting from the 8th character (index 7) up to, but not including, the 13th character (index 12). 

You can adjust the slice to extract different substrings based on your needs. For example, to extract the first three characters of the string, you can use string[:3], and to extract the last three characters, you can use string[-3:].

Conclusion :

In conclusion,it is clear that Python substring methods are versatile and easy to use. Learning how to use these methods can open up a world of possibilities for string manipulation in a program, making coding simpler and more efficient. Furthermore, the ability to access specific characters within a string with ease can help speed up processes, saving time when writing code.

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