How to Javascript String substr in Python

The JavaScript String substr() function is used to extract a portion of a string, starting from a specified index position and continuing for a specified number of characters. The function takes two arguments: the starting index position and the length of the substring to be extracted. If the length argument is not provided, the function will extract the remaining characters from the starting index position to the end of the string. The substr() function does not modify the original string, but returns a new string containing the extracted substring. Keep reading below to learn how to Javascript String substr in Python.

Looking to get a head start on your next software interview? Pickup a copy of the best book to prepare: Cracking The Coding Interview!

Buy Now On Amazon

Javascript String substr in Python With Example Code

JavaScript’s `substr()` method is used to extract a part of a string, starting from a specified index and returns the specified number of characters. Python also has a similar method called `slice()` which can be used to achieve the same functionality. In this blog post, we will discuss how to use the `slice()` method in Python to achieve the same functionality as the `substr()` method in JavaScript.

To use the `slice()` method in Python, we first need to understand its syntax. The syntax for the `slice()` method is as follows:

string_name[start_index:end_index]

Here, `string_name` is the name of the string from which we want to extract a part, `start_index` is the index from where we want to start extracting the string, and `end_index` is the index till where we want to extract the string.

Let’s take an example to understand this better. Suppose we have a string called `my_string` which contains the value “Hello, World!”. If we want to extract the word “World” from this string, we can use the `slice()` method as follows:

my_string[7:12]

This will return the string “World” as it starts from index 7 and ends at index 12.

We can also use negative indexing with the `slice()` method. Negative indexing starts from the end of the string, where -1 is the index of the last character. For example, if we want to extract the last 5 characters from the string “Hello, World!”, we can use the `slice()` method as follows:

my_string[-5:]

This will return the string “World!” as it starts from the second last character and goes till the end of the string.

In conclusion, the `slice()` method in Python can be used to achieve the same functionality as the `substr()` method in JavaScript. By understanding the syntax and usage of the `slice()` method, we can easily extract parts of a string in Python.

Equivalent of Javascript String substr in Python

In conclusion, the Python language provides a similar function to the Javascript String substr function, called the string slicing operation. This operation allows us to extract a portion of a string by specifying the start and end indices. However, there are some differences between the two functions, such as the fact that the Python slicing operation is inclusive of the start index and exclusive of the end index. Additionally, the Python slicing operation can also accept a step parameter, which allows us to extract every nth character from a string. Overall, while the syntax may differ slightly, both the Javascript String substr function and the Python string slicing operation provide a powerful tool for manipulating strings in their respective languages.