{"id":14256,"date":"2023-03-13T07:46:01","date_gmt":"2023-03-13T07:46:01","guid":{"rendered":"https:\/\/www.prepbytes.com\/blog\/?p=14256"},"modified":"2023-04-27T11:28:51","modified_gmt":"2023-04-27T11:28:51","slug":"how-to-create-a-substring-of-a-string-in-python","status":"publish","type":"post","link":"https:\/\/prepbytes.com\/blog\/how-to-create-a-substring-of-a-string-in-python\/","title":{"rendered":"How to Create a Substring of a String in Python?"},"content":{"rendered":"

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One of the fundamental data types in Python is a string. Python Strings are defined as a sequence of characters that includes alphabets, digits, punctuation marks, and other symbols. Sometimes, we need to extract some of the portions of the string for further processing or analysis. In this article, we will learn about Python substring and will also look at some methods of creating a Python substring.<\/p>\n

What is a Python Substring?<\/h2>\n

A Python substring is a contiguous sequence of characters within a string. It can be a single character, a group of characters, or the entire string itself. For example, suppose we are given the string "PrepBytes". For this specified string, some of the substrings are listed as follows: \u201cP\u201d, \u201crep\u201d, \u201cPrepByt\u201d, \u201cBytes\u201d, \u201cPrepBytes\u201d, etc.<\/p>\n

It is important to note that for a group of characters to be considered a substring, it must be present in a contiguous sequence in the original string. There are different ways of creating Python substrings, which will be discussed in detail in the next section.<\/p>\n

String Slicing for Creating Python Substrings<\/h2>\n

Python does not come with any built-in function that performs the task of finding substrings like the subString function in Java or the substr() function in C++. However, Python provides an alternative method called string slicing, which involves extracting a specific portion of the string by specifying its start and end indices.<\/p>\n

Syntax of String Slicing<\/h3>\n

The syntax of String Slicing for generating Python substrings of a string is given as:<\/p>\n

my_str [start: stop: step]<\/code><\/pre>\n
Here, \u201cmy_str\u201d denotes the original string of which we want to find the substring.<\/p>\n
Parameters of String Slicing<\/h3>\n
The parameters of string slicing are as follows:<\/p>\n
    \n
  1. Start index: The position of the first character of the substring. It is included in the substring. The default value of this parameter is 0.<\/li>\n
  2. End index: The position of the last character of the substring. It is excluded from the substring. If not specified, it will take a value equal to the length of the string.<\/li>\n
  3. Step size (optional): The step size determines the number of characters to jump over to get the next character in the substring. By default, the step size is 1.<\/li>\n<\/ol>\n
    Return Type of String Slicing Notation<\/h3>\n
    The return type of string slicing notation in Python is always a string. When a slice of a string is extracted using slicing notation, the result is always a new string containing the specified portion of the original string. The length of the resulting string depends on the difference between the start and end indices of the slice, and it will always be less than or equal to the length of the original string.<\/p>\n
    If the start and end indices of the slice are the same, an empty string is returned. If the start index is greater than the end index, an empty string is also returned. If the specified indices are out of range, an IndexError is raised.<\/p>\n
    Examples of Python Substring<\/h3>\n
    Here are some examples of how to create a Python Substring using the String Slicing Operator.<\/p>\n
      \n
    • \n
      Python Substring Example 1<\/strong>
      \nGetting the First 4 Characters of a String<\/p>\n
      Code Implementation:<\/strong><\/p>\n\t\t\t\t\t\t