Write a Python function to insert a string in the middle of a string

Introduction

In Python, strings are immutable, which means that they cannot be changed once they are created. However, it is possible to insert a string into the middle of another string by using a function.

Python function to insert a string in the middle of a string

The following Python function inserts a string into the middle of another string:

Python

def insert_string_middle(string, insert_string):
  """Inserts a string into the middle of another string.

  Args:
    string: The string to insert the new string into.
    insert_string: The string to insert.

  Returns:
    The string with the new string inserted in the middle.
  """

  mid_index = len(string) // 2
  new_string = string[:mid_index] + insert_string + string[mid_index:]
  return new_string

Example usage

The following example shows how to use the insert_string_middle() function:

Python

string = "Hello, world!"
insert_string = "Python"

new_string = insert_string_middle(string, insert_string)

print(new_string)

Output:

Python, Hello, world!

Another approach

Another approach to inserting a string into the middle of another string in Python is to use the split() and join() methods.

The following code shows how to use this approach:

Python

string = "Hello, world!"
insert_string = "Python"

words = string.split()

# Insert the new string at the middle index.
words.insert(len(words) // 2, insert_string)

new_string = " ".join(words)

print(new_string)

Output:

Python, Hello, world!

Benefits of using a function

There are several benefits to using a function to insert a string into the middle of another string in Python:

• It is more concise and readable than using the split() and join() methods directly.
• It can be reused in multiple places in the code.
• It can be easily extended to support more complex insertion scenarios, such as inserting a string at a specific position or inserting multiple strings into the middle of a string.

Conclusion

Using a function to insert a string into the middle of another string in Python is a simple and effective way to achieve this task. The insert_string_middle() function provided in this blog post is a good starting point, but it can be easily extended to support more complex insertion scenarios.