text: '''
  Author: Luke Hebert
  Date begun: 2019 04 10
  Description:
  	input: a .txt file containing a string of any combination of G,A,T, & C
  	output: a .txt file containing a string of the corresponding RNA letters G, A, U, & C
  '''
  
  import sys
  import os
  
  slash = '/'
  if os.name == 'nt':
      slash = '\\'
  
  inFile_path = sys.argv[1]
  
  rna_str = ''
  
  with open(inFile_path, 'r') as inFile:
      for line in inFile:
          rna_str += line.strip('\n').replace('T','U').replace('t','u')
  
  outFile_name = inFile_path.split(slash)[-1].replace('.txt','') + '_RNA.txt'
  with open(outFile_name, 'w') as outFile:
      outFile.write(rna_str)
  