Python Math: Reverse a range

Last update on December 21 2024 07:34:59 (UTC/GMT +8 hours)

Write a Python program to reverse a range.

Sample Solution:

Python Code:

#https://gist.github.com/fcicq/ddb746042150b4e959e6
def reversed_range(start, stop=None, step=1):
  if stop is None:	
    return range(start - step, -step, -step)
  else:
    new_start = stop - ((stop-start-1) % step + 1)
    new_end = new_start - (stop-start+step-1) // step * step
    if (stop - start) % step == 0 and step < 0: new_start -= step
    return range(new_start, new_end, -step)

print(reversed_range(1, 10, 2))

print(reversed_range(1, 5, 1))

Sample Output:

range(9, -1, -2)                                                                                              
range(4, 0, -1) 

Flowchart:

Python Code Editor:

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