When it is required to concatenate strings around ‘K’, a simple iteration and the ‘append’ method is used.
Below is a demonstration of the same −
my_list = ["python", "+", 'is', 'fun', "+", 'to', 'learn'] print("The list is :") print(my_list) K = "+" print("The value of K is :") print(K) my_result =  index = 0 while index < len(my_list): element = my_list[index] if (index < len(my_list) - 1) and my_list[index + 1] == K: element = element + K + my_list[index + 2] index += 2 my_result.append(element) index += 1 print("The result is :") print(my_result)
The list is : ['python', '+', 'is', 'fun', '+', 'to', 'learn'] The value of K is : + The result is : ['python+is', 'fun+to', 'learn']
A list of strings is defined and is displayed on the console.
The value of ‘K’ is assigned a string and displayed on the console.
An empty list is defined.
An integer value is initialized to 0.
The integer value is checked to be less than the length of the list.
If so, the element at the specific index is assigned to a variable.
The integer variable and length of the list are compared again, and the element is assigned a different value.
The integer is incremented by 2.
In the end, this variable is appended to the empty list, and the integer is incremented by 1.
The result is the variable which is displayed on the console.