Python Substring I How to Substring a String in Python

Python Substring I How to Substring a String in Python

A sequence or series of characters with unique and alphanumeric characters are used in Python substrings. The biggest difference between them and character arrays is that the arrays are slightly different. Strings, on the other hand, will be treated as arrays for the most part.

In Python, a substring is a character sequence followed by another string. It’s also known as “string slicing.” Our strings will benefit from Python’s array features, known as ‘slicing.’ Slicing is a collection of capabilities that can be extended to any kind of array object.

Part of a string is called an interface. There are many ways to create a python substring and to check whether a substring is in a string, a substring index, or more. Let’s look at different substring activities.

To get the substring from the main string or source string, we have different functions in different programming languages.


In Java, for example, the substring method is used to extract a substring from a main or source string. In Python, you can extract a substring, which is a section of a string, using a variety of methods. Python does not have any substring or substr methods. However, slicing and extended slicing can be used to accomplish this.

Let’s take a look at an example of how to use an array

The preceding example clearly demonstrates a subset of an array that is only used up to the third element. The beginning and ending positions of your choice in the array are indicated by two ‘arguments’ in Slicing.

Syntax: array[start:end]

Syntax: array[start:end]

If you just want elements 2 and 3 in the above example, you must do the following:

How to Get a Substring

Strings are byte arrays containing Unicode characters in Python. It is possible to use array-like indexing to reach the individual string characters. Like a table data type with items that are equal to an index number, each character of a string is equivalent to an index number beginning with the index number 0.

What is slicing?

Slicing is a Python method for extracting a subset of data from a given sequence, such as a string, list, or tuple. Based on a collection of indices, a slice object is formed. Start, stop, and phase indices may all be defined.


By Slicing Python Strings How to get Sub-strings?

As discussed above, strings and arrays can be managed similarly, and similar logic can then be extended to strings. Consider an example showing how this logic functions:

Oh, my goodness! Oh, my goodness! You could access the character much as an array function could.

The above example shows a “sub-string” from a string. A “sub-string” may be made from a string by precisely positioning the beginning and ending points.

You will vomit the start and/or end positions, however. By doing so, you’re telling Python that you want to start a sub-string from the beginning or end it at the end, respectively.

Here is another example of how the above justification can be used:

Even if you didn’t specify the start or endpoint, you might be wondering how it worked! In this case, we’ve told Python to get the start element and the end element. This method is simple and efficient. A new copy of the string or sequence is also made in this case. This original copy can be used as a guide as well as for potential changes.

Reverse Sub-string Slicing

Extended slicing may also be used to obtain the reverse order of a sub-string. The following example is only given for your convenience if you’ve ever used Python’s reverse sub-string slicing.

In the example above, the additional colon denotes the extended slice. The string is traversed using the “-1” index. You will get the same result if you use “1” instead of “-1.”

Substring a string in Python can be done in a variety of ways. It’s commonly referred to as slicing.’

It follows this template:

string[start: end: step]


start: The substring’s starting index. The substring includes the character at this index. If the start isn’t specified, it’s assumed to be 0.

end: The index in which the substring ends. The character at this index is not included in the substring. If the end is not specified, or if the given value exceeds the string length, it is assumed to be equal to the string length.

step: After the current character, every ‘step’ character must be included. 1 is the default value. If the phase value isn’t specified, it’s presumed to be 1.


string[start:end]: Get all index characters from start to end-1

string[:end]: Get all characters in the string from the beginning to the end-1

string[start:]: Get all characters in the string from the start index to the end index.

string[start:end:step]: Get all of the characters from the beginning to the end, taking into account each step character.


Get the first 5 characters of a string

string = “freeCodeCamp”



> freeC

Get a substring of length 4 from the 3rd character of the string

string = “freeCodeCamp”



> eeCo

It’s important to keep in mind that the start or end index could be negative. When you use a negative index, you count from the end of the string rather than the beginning (i.e from the right to left). The string’s last character is represented by index -1, the second to last character is represented by index -2, and so on…

Get the last character of the string

string = “freeCodeCamp”



> p

Get the last 5 characters of a string

string = “freeCodeCamp”



> eCamp

Get a substring that contains all characters except the last 4 characters and the 1st character

string = “freeCodeCamp”



> reeCode


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