Python - Insert character in each duplicate string after every K elements

Python - Insert character in each duplicate string after every K elements

If you want to insert a character into each duplicate string after every K elements, you'd need to keep track of the occurrence of each string and modify them accordingly. Let's work through this using an example.

Suppose you have the following list of strings:

strings = ["apple", "banana", "apple", "apple", "grape", "banana", "apple"]

And you want to insert the character - after every 3rd character for each duplicate occurrence of a string.

Step-by-step Solution:

  1. Create a dictionary to store the occurrence count of each string.
  2. Loop through the list of strings.
  3. For each string, if it's a duplicate (i.e., occurred before), insert the character after every K elements.
  4. Store the modified string back to the list.

Let's code this:

def insert_char_at_k(s, char, k): """Inserts char after every k elements in string s.""" return char.join([s[i:i+k] for i in range(0, len(s), k)]) strings = ["apple", "banana", "apple", "apple", "grape", "banana", "apple"] char_to_insert = '-' K = 3 occurrences = {} for index, string in enumerate(strings): if string in occurrences: occurrences[string] += 1 modified_string = insert_char_at_k(string, char_to_insert, K) strings[index] = modified_string else: occurrences[string] = 1 print(strings) # Outputs: ['apple', 'banana', 'app-le', 'app-le', 'grape', 'bana-na', 'app-le']

In the above code:

  • The insert_char_at_k function handles the task of inserting a character after every K elements in a string.
  • We maintain a dictionary called occurrences to track how many times we've seen a particular string.
  • When we encounter a string that's already in the occurrences dictionary, we know it's a duplicate, so we modify it and update the list.

This approach ensures that the first occurrence of any string remains unmodified, while subsequent occurrences get the specified character inserted after every K elements.

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