How to reverse a string in Python without using 'reversed' function

Reminder

• It is possible to iterate over strings! No need to split string into lists for that matter. (Unless you have to reverse a text! Example: "I love you" to "you love I"). Related reading: Best way to loop over a python string backwards

Key

• Use of a for loop and range()

The solution

• Trick is to get index of each string character in reverse fashion then use the indices to slice the string backwards

  def reverse(astring):
  	rev = ''
  	for i in range(len(astring), 0, -1) # start, end, step
  		rev += astring[i-1] # add the last character of rev and so on 
  	return rev

References

1. Best way to loop over a python string backwards