How to add a phrase in the middle of a Python string?

Strings are a fundamental data type in Python, and manipulating them is a common task in many programming scenarios. One specific requirement you may encounter is the need to insert a phrase or substring in the middle of an existing string. Python provides a variety of methods and techniques to accomplish this task efficiently. In this blog post, we’ll explore some of these methods and discuss how to add phrases in the middle of strings in Python.

Let’s explore different ways to add phrases in the middle of Python strings. We will introduce methods such as string concatenation, f-strings, and the str.format() method, demonstrating their effectiveness and highlighting their advantages in different scenarios. After reading this blog post, you will have a solid understanding of how to accomplish this task and have the knowledge to apply it to your own Python projects.

Use string concatenation

A straightforward way to add a phrase in the middle of a string is to use string concatenation. Operators can be used to concatenate multiple strings together. This is an example −

Example

original_string = "Hello, world!"
phrase_to_insert = "beautiful "

middle_index = len(original_string) // 2
new_string = original_string[:middle_index] + phrase_to_insert + original_string[middle_index:]

print(new_string)

Output

Hello, beautiful world!

In the above code, we use slices to split the original string at the desired location, then concatenate the original string with the phrase to be inserted, and finally concatenate the remaining parts of the original string.

While string concatenation works well for small strings, it can become inefficient when dealing with large strings. This is because each concatenation operation creates a new string object, resulting in unnecessary memory allocation.

Use string format

Another way to add a phrase in the middle of a string is to use string formatting. Python provides several methods for formatting strings, including the format() method and f-string. Here is an example using f string -

Example

original_string = "Hello, world!"
phrase_to_insert = "beautiful"

middle_index = len(original_string) // 2
new_string = f"{original_string[:middle_index]} {phrase_to_insert} {original_string[middle_index:]}"

print(new_string)

Output

Hello, beautiful world!

In this example, we use f string for string interpolation to insert the phrase into the original string at the desired position. This approach provides a concise and readable syntax.

Use str.join() method

The str.join() method can be used to join a list of strings, inserting a delimiter between each element. You can use str.join() to create the final string by splitting the original string into two substrings and combining them with the phrase you want to insert.

Example

This is an example−

original_string = "Hello, world!"
phrase_to_insert = "beautiful"

middle_index = len(original_string) // 2
new_string = ' '.join([original_string[:middle_index], phrase_to_insert, original_string[middle_index:]])

print(new_string)

Output

Hello, beautiful world!

In this example, we split the original string into two parts and then create a list containing these parts along with the phrase to insert. The str.join() method is used to join the list elements using space delimiters, thus producing the desired output.

Using str.join() is useful when you want to insert multiple substrings or phrases as it allows you to easily join them using a specific delimiter.

Slicing and redistribution

Another way to add a phrase in the middle of a Python string is to directly manipulate the string by slicing and reassigning. This method involves splitting the original string into two parts and reassigning the concatenated parts to the original variables.

Example

This is an example−

original_string = "Hello, world!"
phrase_to_insert = "beautiful"

middle_index = len(original_string) // 2
original_string = original_string[:middle_index] + phrase_to_insert + original_string[middle_index:]

print(original_string)

Output

Hello, beautiful world!

In this example, we reassign the value of original_string by concatenating three parts: the substring from the beginning of the original string to the middle index, the phrase to be inserted, and the substring from the middle index to the end. Raw string. This method directly modifies the original variable, which is useful when you want to update a string in place.

in conclusion

Here we explore several ways to add phrases in the middle of Python strings. We discussed string concatenation, f-strings, str.format() method, str.join() method, and reallocated slices. Each method has its own advantages and can be used based on your specific requirements and preferences.

By understanding these different techniques, you can choose the most appropriate method for adding phrases in the middle of a string, based on factors such as readability, performance, and the version of Python you are using.

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