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Python Loop over List and swap elements

Posted by Scratches on January 18, 2023

Swap elements in a list of any size

  • assign length variable with the current list’s length for convenience
  • for loop runs through body length // 2 times, to leave middle element of odd lists untouched
  • swap the ith element with the element equal to (length - i) - 1
  • i.e. when i is element 0 the swap is with element 4 –> (length - 0) - 1
my_list = [10, 1, 8, 3, 5]
length = len(my_list)

for i in range(length // 2)
   my_list[i], my_list[length - i - 1] = my_list[length - i - 1], my_list[i]
   
print(my_list)
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