text: #!/usr/bin/env python3
  
  # Write a program that prints the reverse-complement of a DNA sequence
  # You must use a loop and conditional
  
  dna = 'ACTGAAAAAAAAAAA'
  
  anti = ""
  for i in range(len(dna)):
  	nt = dna[::-1][i]#[::-1] inverse func
  	if   nt == 'A': anti += 'T'
  	elif nt == 'C': anti += 'G'
  	elif nt == 'G': anti += 'C'
  	else		  : anti += 'A'
  print(anti)
  	
  #for i in range(len(dna):
  #j = len(dna) -i -1
  #print(i, j) also goes backwards
  #print (len(dna), i)
  """
  python3 23anti.py
  TTTTTTTTTTTCAGT
  """
  